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Bureau of Mines Report of Investigations 5350 I I /I INVESTIGATION OF SUBBITUMINOUS-COAL BEDS NEAR HOUSTON, WESTWARD EXTREMITY OF MATANUSKA COALFIELD, ALASKA BY R. R. MAY AND R. S. WARFIELD I t United States Department of the Interior-August 1957 I---- INVESTIGATION OF SUBBITUMINOUS-COAL BEDS NEAR HOUSTON, WESTWARD EXTREMITY OF MATANUSKA COALFIELD, ALASKA BY R. R. MAY AND R. S. WARFIELD * * * * * * * * *Report of Investigations 5350 UNITED STATES DEPARTMENT OF THE INTERIOR Fred A. Seaton, Secretary BUREAU OF MINES Marling J. Ankeny, Director Work on manuscript completed November 1956. The Bureau of Mines will welcome reprinting of this paper, provided the following footnote acknowledgment is made: "Reprinted from Bureau of Mines Report of Investigations 5350." August 1957 I INVESTIGATION OF SUBBITUMINOUS-COAL BEDS NEAR HOUSTON, WESTWARD EXTREMITY OF MATANUSKA COALFIELD, ALASKA by R. R. Mayl/ and R. S. Worfield / CONTENTS Page Summary .................. ....................................... 1 Introduction ..... .... .......... ,...... .,... ... ......... 1 Acknowledgments .......... ........ ... ...... .... 0. ......... 2 Description of area............... ............ ........ .. 2 Location and access .................... ...... 2 Topography. ................... ..... ...... .... ....... 2 Climate (as it affects operations).... ..... .............. 2 History and production,.. .. .... ............ ................... 4 Geology .... ................................ ...... .......... .4 The coal ..... .....,,................... ..... .......... 5 Coal sampling and analysis ........................... 5 Mining and preparation...... .... ........ ........... 7 Work by the Bureau of Mines ............ ......................... 7 Preliminary examination... .... ................. ..... 7 Diamond drilling......... ......... ...... ........... ..... 7 Interpretation of drilling results...............,...... 9 Appendix.............. ...................................4..... 12 Logs of drill holes...................................... 12 1/ Solid fuels mining engineer, Bureau of Mines, Region I, Alaska district, Anchorage, Alaska. 2/ Mine examination and exploration engineer, Bureau of Mines, Region I, Juneau, Alaska. Report of Investigations 5350 ii ILLUSTRATIONS Fig. Page 1. Location map, Houston coal-drilling project ................. 3 2. Plan, Houston coal-drilling project......................... 8 3. Section A-A' and graphic logs, Houston coal-drilling project 10 TABLES 1. Section in strip mine near old Evan Jones slope............. 6 2. Section in strip mine 1,200 feet northeast of old Evan Jones slope ............................................... 6 3. Analyses of face samples from section 1,200 feet northeast of old Evan Jones slope .................................. 6 4. Analyses of diamond-drill core samples from Houston coal- drilling project ........................ ......... 11 1 SUMMARY A preliminary examination of the Houston strip-coal mine, situated on the Alaska Railroad at milepost 175 (61 rail miles north of Anchorage, Alaska) and a review of all available information resulting from early coal exploration activities in the area resulted in plans to investigate the coal-bearing formations at depth by means of diamond core drilling to indicate the existence of additional reserves of coal in close proximity to railroad transportation, where it would be quickly available to meet rapidly expanding military and civilian fuel requirements. From the date of mobilization of equipment, August 28, 1951, until date of sus- pension, August 18, 1952, 2-,010 feet of diamond drilling was completed. Ten defin- able coal beds were cut, of which 2 appear to be persistent and minable over an area of approximately 1/2 square mile. Within this area the 2 minable beds contain approximately 5,000,000 tons of coal in place. Of the remaining beds, at least two others may be minable to the eastward near their projected outcrops; however, these and deeper beds (at least in the vicinity of the drill holes) lie beneath a zone of pressurized gas and brackish water. From a practical standpoint, continued develop- ment and utilization of the coal in this vicinity will depend on the operators' in- genuity in developing cheap mining methods and on diligent prospecting for strippable coal under the comparatively light glacial cover. INTRODUCTION Since the advent and expansion of military installations in south central Alaska, coupled with the resultant rapid growth of population, the delineation and development of the Matanuska coal field have assumed considerable importance, particularly in those parts of the field that are accessible by existing transportation facilities. Little work of an evaluating nature had been done before this project was undertaken at the western end of the Matanuska field, which abuts the main line of the Alaska Railroad at Houston, approximately 60 miles north of Anchorage. Although the rank of the exposed beds in the immediate vicinity of Houstin is subbituminous, recent exploration by the Federal Geological Survey indicated a defi- nite tie with the extensive bituminous beds of the Chickaloon coal-bearing formation now in production a few miles eastward. Discovery of additional minable beds not only would augment the Houston-area reserve but might lead to the discovery of nearby reserves which, because of closer proximity to the Talkeetna Mountain uplift, might have bituminous rank. From observation of past and present workings and of the indicated geological attitude of the coal-bearing formation, it appeared that a very limited drilling pro- gram would procure the desired information. The following report presents the data obtained by the drilling program and an interpretation of the data. 2 ACKNOWLEDGMENTS Many of the historical data, as well as cooperation in appraisal and sampling before initiation of the project, were furnished by Dr. George Gates and Dr. Farrell Barnes of the Alaskan Geology Branch, Federal Geological Survey. Core and face sam- ples of coal taken before and during the work were analyzed by the Bureau of Mines Coal-Analysis Section, Pittsburgh, Pa., under the direction of R. F. Abernethy, chief. The engineering department of the Alaska Railroad furnished basic alinement and ele- vation details upon which the survey of the drilling area was based. Tucker & Peter- son, lessors, and Duck Flat Co., production contractors, assisted the work by fur- nishing housing and messing facilities and the occasional use of heavy equipment. DESCRIPTION OF AREA Location and Access The limited area covered by the activities described in this report is within 2 miles of Houston, a station at 240 feet altitude on the main line of the Alaska Rail- road at mile 175 (fig. 1). Houston is 61 miles north of Anchorage, near the western toe of the Talkeetna Range, on the edge of the broad Susitna River Valley. When this project was in progress there was no highway access, but a road from Pittman (mile 167 on the Alaska Railroad) has since made the mine accessible over the Alaska high- way system. Topography The Houston-project area is on the eastern edge of the Susitna River Valley, which is essentially a broad tundra flat cut by many, very small, meandering creeks. The Alaska Railroad follows the toe of the foothills that slope gently upward toward the mountains in an undulating series of benches; the project area is beside the rail- road and at the base of this terraced slope. The Susitna Valley, which at this point is fully 25 miles wide, appears to be covered with a semisubmerged, recessional moraine. Tundra areas on this moraine consist of grassy swamps and pools, with patches of scrubby spruce and brushy willow. The rising ground to the eastward is covered by glacial de- posits of various types and by a thick forest growth; spruce and birch predominate. As might be expected in an area where bedrock is almost completely concealed, the orig- inal coal discovery was made in a cut incidental to railroad construction. Climate (As It Affects Operations) The climate here is suitable for outside operations during only about 6 months of the year, unless shop facilities are heated and insulated and unless all-weather roads are constructed and at considerable expense. January and February are the coldest months, with an average daily low of minus 20°. During June, July, and August the daily high usually is in the 60's, but during calm, clear days the temperature often is in the 80's. Annual precipitation records for the immediate vicinity of Houston are not available, but estimates indicate a combined rain and snow content of about 50 inches. Except where it is drifted, winter snows seldom accumulate to depths of more than 3 feet. Summer rains generally are unpredicatable as to monthly intensity; they seldom are heavy but often are persistent enough during early and late summer to hamper hauling and road-maintenance work with heavy equipment. The outdoor working season for stripping overburden usually is mid-May to mid- October, although much subsidiary work can be done a month or so before and after these dates; however, unless expensive methods are adopted, mining operators seldom 3 Figure 1. -Location map, Houston coal-drilling project. 4 strip overburden until June, because the ground usually freezes to a depth of 5 to 7 feet; thawing produces a tremendous amount of surface water, which bogs down most heavy equipment. HISTORY AND PRODUCTION Coal was discovered in a right-of-way cut on the Alaska Railroad at Houston station in 1917. Although the early history of the development is somewhat clouded, it is known that, between 1917 to 1920, a coal-prospecting permit was granted on the 10-acre tract at the discovery site and that 2 slopes were driven on the coal meas- ures. According to reports, the slopes entered 2 beds of coal, which were 3-1/2 and 5 feet thick, respectively; the beds dipped 6° to 15° northeasterly. Production dur- ing this period is estimated at 10,000 to 15,000 tons of coal, which was sold to the Alaska Railroad and to the domestic market in Anchorage. All of the original work- ings have long been caved; even the caves are completely obscured by brush and slides. The site of this early activity is approximately one-half mile southeasterly of the present workings, from which it is separated by a low-lying muskeg swamp; therefore correlation of the discovery beds with beds in the project area would require consid- erable prospecting work beyond the scope of this project. Between 1920 and 1934 no mining or development work of consequence was done near Houston. In 1934 Arthur Heaven was granted a 160-acre homestead, which included patent rights to underlying coal. In 1935 Evan Jones obtained prospecting permits for 874.82 acres adjoining the homestead in sections 17, 18, and 20; in the same year he started a slope mine near the present position of the southeast corner of the strip pit. About 12,000 tons of coal was produced from the slope and from a few rooms before the operation was suspended in 1940. Between 1938 and 1940 Jones joined in partnership with George Tucker and Ralph Peterson; during this period the Heaven patent was purchased and became the nucleus of later operations. This partnership was terminated in 1940; thereafter permits were allowed to lapse until a revival of interest in 1948, when an expanding military market became apparent. In 1948 Tucker and Peterson organized the Houston Coal Co. and acquired a permit for access to an additional 1,800 acres next to the Heaven patent; from 1949 through the 1952 season approximately 65,000 tons of coal was marketed. Most of the coal was passed through a crushing, screening, and washing plant, which contained a Forrester- type jig capable of handling 15 to 25 tons per hour. Production during 1951 and 1952 was under a management-sales agreement with the Duck Flat Co., a Los Angeles organi- zation. Virtually all production went to the military installations at Anchorage. GEOLOGY The geology of the Matanuska coal field is best known from the writings of Go C. Martin of the Federal Geological Survey, who first made a general reconnaissance of the region in 1905 and subsequently made detailed studies of the lower3/ and upper4/ parts of the field in 1910 and 1913, respectively. As defined in early descriptions, the upper or eastern part of the Matanuska field included the Anthracite Ridge and Chickaloon districts; the lower or western part included the Eska and Moose Creek areas, as well as Wishbone Hill. Recent reconnaissance by the Geological Survey along the lower reaches of the Little Susitna River and its tributaries and the work at Houston by the Bureau of Mines indicate that the Matanuska field extends westward 3/ Martin, G. C., and Katz, F. J., Geology and Coalfields of the Lower Matanuska Valley, Alaska: Geol. Survey Bull. 500, 1912, 98 pp. 4/ Martin, G. C., and Mertie, J. B., Jr., Mineral Resources of the Upper Matanuska and Nelchina Valleys: Geol. Survey Bull. 592, 1914, pp. 273-299. I 5 from Moose Creek and includes the northern edge of the lowlands lying north of Knik Arm. Barnes designates these lowlands as the Little Susitna district of the Matanuska coalfield; Houston and the project area are in this district.5/ The following generalized description of the geology of the Matanuska coalfield is summarized from the above-cited publications, to which the reader is referred for details: All coal measures in the field occur in the Chickaloon formation (Tertiary), which is composed of 3,000 to 5,000 feet of claystone, siltstone, sandstone, thin beds of fine-grained conglomerate, and many beds of coal. The Chickaloon formation is overlain by the Eska conglomerate (Tertiary) and underlain by the Matanuska and Arkose ridge formations (Upper Cretaceous). The Eska conglomerate is not present in the stratigraphic section at Houston. Neither the Matanuska formation nor the Arkose ridge formation is exposed near Houston. At Houston and throughout the field individual beds in the Chickaloon formation, including the coal, tend to thin out or intergrade within relatively short distances. These changes in bed thickness are believed to be due primarily to the original len- ticular structure of the sedimentary deposits but also may be due in part to the crumpling and pinching out of the soft shales incident to folding of parts of the region; correlation of individual beds (including coal) for more than short distances is therefore uncertain or impossible. Correlation of the coal measures between districts, and often between mines in the same district, is complicated further by differences in the character of the coal that result from differences in the amount of faulting and folding from place to place. The coal at Houston is subbituminous; it occurs in relatively flat lying beds that have suffered little or no deformation. THE COAL Coal Sampling and Analysis The following sections and samples were taken by R. R. May, Bureau of Mines min- ing engineer, and F. F. Barnes, geologist, Geological Survey, September 26, 1950. Sections and samples were taken in accordance with Bureau of Mines standard procedure and forwarded to Pittsburgh for analysis. 5/ Barnes, Farrell F., and Payne, Thomas G., The Wishbone Hill District, Matanuska Coal Field, Alaska: Geol. Survey Bull. 1016, 1956, p. 2. Roof: Gray shale, coaly at base. Coal, dull glossy/ ....................................... Bone, bright-coal streaks................................. Coal, bright!/............................................. Coaly shale./............................................. Coaly shale and bone.2/................................... Coaly/ ........................ Coaly shale2./... ............................................. Coal, clay slips./........................................ Bone...................................................... Floor: Coaly shale............................................... 6 TABLE 1. -Section in strip mine, near old Evan Jones slope (top bench of strip-mine bed) Roof: Gray claystone, silty. Feet Inches Coaly shale to bone...................................... 0 2-1/2 Coal .................................. .................. .. 1-1/2 Coaly shale................ ................................ 1 Coal ..................................... 10 Bone ................................................... ... 7 Coal, bright ........................ ........ ............. 1 1-1/2 Bony coal..... ...................................... ......3-1/2 Coaly shale.l/ ............................................. 2 Claystone, thin coal stringers............/ ............ .............. 8 Claystonel/ ................................................. 2 0 Bony coal (top of lower bench) ............................. Partly exposed. 1/ Denotes parting between upper and lower benches. TABLE 2. -Section in strip mine 1,200 feet northeast of old Evan Jones slope (full section, both benches) I Feet Inches 0 9 7 1 0-1/2 1 4 2 4 1 0 4 6 2 Partly exposed. 1/ Included in analysis,lab. No. D-51894 (table 3). 2/ Denotes parting between benches. 3/ Included in analysis,lab. NO. D-51895 (table 3). TABLE 3. -Analyses of face samples from section 1,200 feet northeast of old Evan Jones slope Air-drying Vol. Fixed Sample loss Condition Moisture matter Carbon Ash Sulfur B.t.u. D-51894 7.6 A 20.3 31.6 38.9 9.2 0.4 9,210 B 13.7 34.2 42.1 10.0 .5 9,970 C 39.6 48.9 11.5 .5 11,550 D 44.8 55.2 .6 13,060 D-51895 6.7 A 17.4 32.5 36.6 13.5 .4 9,160 B 11.5 34.8 39.3 14.4 .5 9,820 C 39.3 44.4 16.3 .5 11,090 D 47.0 53.0 .6 13,250 Condition: A -as received. B -air-dried. C -moisture-free. D -moisture- and ash-free. Analyses by H. M. Cooper, Bureau of Mines, Pittsburgh, Pa. 7 Mining and Preparation Coal at the Houston mine (see table 1 for average section) is stripped and then mined in successive benches by drilling vertical blast holes with a portable electric auger on 5-foot centers; these holes are blasted lightly with 20-percent gelatin. After being broken, the coal is loaded by power shovel onto trucks, which haul it to the washing plant approximately 1 mile from the pit. The raw coal tends to be coarse and slabby, with many iron-silica-sulfur concretions; therefore it requires prelimi- nary breaking before being fed to the rolls. This breaking is accomplished by using a small crawler tractor to crush oversize through an 8-inch grizzly into the roll- crusher feed bin. Crushed coal for jig feed is sized to suit current contract spec- ifications, which usually require 2-1/2 inches top size. This product is fed either directly to through surge bins to a steam-driven Forrester-type coal jig with a 4- by 4-foot plunger section and a 4- by 6-foot bed section. The washed-coal discharge passes over a double-deck shaker sizing screen, with impinging sprays. Screen sizing varies with contract purchase specifications; fines may be optionally recovered in an Esperanza-type classifier in closed circuit with washer and screen or discarded sepa- rately. Because the plant level at the screen discharge is 30 feet or more above the car-loading siding, gondolas are loaded by chuting the coal to the cars. For best washing results plant capacity is 15 to 20 tons per hour, but careful mining often permits considerable overloading without appreciable detriment to the quality of finished coal. Observation of the plant operation under varying conditions indicates that the Forrester jig is not an ideal medium for separating this coal and its inherent impu- rities. Although the tendency of this coal to break in thin slabs undoubtedly af- fects jigging separation, it is apparent that there is a rather narrow differential in specific gravity between the shale-bone-coal components in this particular bed system. WORK BY THE BUREAU OF MINES Preliminary Examination In September 1950, accompanied by F. F. Barnes of the Geological Survey, the writer inspected the mining activity at Houston. Bed sections were recorded, and samples were taken from the strip pit (see tables 1, 2, and 3). After the prevalent strike and dip of the measures (which were partly exposed for nearly a mile along the railroad) were ascertained, it was tentatively concluded that numerous beds on very moderate dips probably were present in the area. Before this examination the current lessors had put down several shallow auger holes in a mile-long area that extended a half mile or so from the railroad; these holes penetrated the overburden into bedrock until coaly material was found. Be- cause this coaly material was encountered within narrow ranges in a high percentage of the holes, it was assumed that the coal bed was undulating in some conformance with the existing topography and that the bed would be strippable throughout a large area. However, later evidence disproved this assumption; consequently, it was decided that a core-drilling pattern that would consist of 2 or 3 holes at intervals downdip would be required to clarify the situation. Diamond Drilling A Bureau of Mines diamond drill was shipped to Houston in late August 1951. The first hole was started near the strip pit highwall. This location (see fig. 2) was -9 /\ \.4 Legend Doimond drill hole 8 I I I *^ oMP4qge Ipoo SOC Figure 2. -Plan, Houston coal-drilling project. chosen to establish initial correlation of the coal measures with reference to the existing mine workings. Drilling conditions were difficult from the start; conse- quently, progress was slow. A heavy flow of gas and brackish water, which was en- countered during freezing weather, caused a shutdown November 10 at a hole depth of 481 feet 7 inches. The condition of the hole precluded resumption of drilling at this location at the beginning of the next season. Hole 2 was started May 29, 1952, at a new location; it reached a depth of 1,142 feet, which was considered sufficient to intercept any coal beds likely to outcrop or to come within practical mining depth within a radium of a mile or so. Hole 2 was completed August 5, 1952, and the drill was moved to the third location farther downdip, where drilling was resumed August 10. Hole 3 was completed August 18 at a depth of 386 feet. Termination at this relatively shallow depth was decided upon as soon as it appeared that a positive point of correlation with beds in hole 2 had been reached. Holes 2 and 3 were spaced at intervals of 2,050 and 2,910 feet, respectively, which was considered the maximum distance allowable for accurate correlation. Depths were governed by practical considerations of possible future mining operations within the immediate Houston area. The locations of the drill holes, pit, and washing plant and the topography of the Houston area are shown in figure 2. Graphic logs and a section through the drill holes are shown in figure 3. Analyses of core-drill samples are presented in table 4. Detailed descriptive logs of the drill holes and the results of megascopic examina- tion of coal core sections are given in the appendix. Interpretation of Drilling Results The area of conclusive results, particularly with regard to estimation of re- serves, should be limited to no more than a rectangular area, approximately 1 mile by 1/2 mile, whose long axis is roughly along the line of the 3 holes drilled. A number of thin coal beds dip 5° to 10° northwesterly; these beds may overlie or underlie the strip bed. Within this area no appreciable faulting or folding is apparent, but some minor folds or displacements may be concealed by the cover of glacial deposits and forest growth. Although several beds appear to be minable and an appreciable tonnage is in- dicated, it would be inadvisable to accept the reserve estimates without careful consideration of local peculiarities. Some of the factors that might modify the reserve estimates follow: (1) Washer recovery varies widely according to the type of cleaning equipment and mining practice. (2) It has been many years since underground mining has been practiced at this location; consequently, no accurate recovery factor is assignable. (3) Because of adverse drilling conditions, friability of the cored material, and the haphazard distribution of concretions in the coal measures, considerable difficulty was experienced in recovering core samples for other than visual inspec- tion and for comparison with coal currently being mined; therefore, core-drill sam- ples may not be exactly representative of the thickness and character of the coal beds drilled. 9 300 200 100 0 -100 -200 -300 -400 -500 -600 -700 -800 10 Collar El. 249 Collar El. 330 Collar EL 303 l. ll :::hl'i111,' l : , ,t, .ii: 'li:J',i : : ::llal*. l:l::h :,'lt:'o :;' :':' iI 'r :I.ij : :1 ::l1 I : 't: N I iji ' |: ;' :i : .:O :: :;:: -' :: 0 0 0 0 0 0 0 0Ut o 0 u o --CU T)u'n Od 0 Io Ur ro OI glliiii-:ir:.iil::l/li~llllr~l:i ::1151·:::i"':::lii;l-I rO~jpal-oriir:::::.:.::t:t~f ~i:t-i 'i i ' I ' I .I I I 0 0 0 0- k. L 0 ----I N-- O //O O I 0 0o oo toO 117 0 -0 0-' u ,'t slD 0 0g,0 0'in oIn ;D 0In (0 0 01- 0 0 O 0O r.- cO 0 GOcc :::: ..·.:1,:·:: :· · ·:·:I:::·: :·.·;··.·.· ''' ;:IEYI I· ·r· :I:''`''"'':':::' -.....-.,. ''':::I·] - ··::···:· ···: ·,,,,'Eilli o I·;YI; ;Il·,;r:: ···1:· ....··.·-..·.·.·. : 0 00 00 0 C ± o m 1 C -m --, a o A >0 >0 0 -c 0 t -0 0 0^ o 6 6 In O 0 0 L, o -cN 0 to N 00 Tr o 0 0 ^1- 0 t Figure 3. -Section A-A' and graphic logs, Houston coal-drilling project. I TABLE 4. -Analyses of diamond-drill core samples from Houston coal-drilling project proximate analysis, Ultimate analysis, Fusability of ash, percent -percent O F.___ 0C .4 C i O I i 4o .0 i C 0 g bOZ4J I 1 10.8 329 37.3 .0 5.3 53 1.4 20.8 0.4 19.0 929 2,310 0 2, 740 .5D-74890 2 -3. 32.1 3& .r-C CP 4 1.3 2 .3 15 9,00 (Hole 4) 3 36.9 41.8 21.3 4.6 59.5 1.5 12.7 .4 21.3 10,420 J-J *-4 -0t 0 0 0 3 r M ai ) 4 4a i- N c4 -4 51 .8 75.6 2.0 16. .5 1,240Lab. 0 r 14- 4 4 4- -4 ri g H-4 O4 ctCL O B a0 > Xi 53 c aM No.1 ! c z > E r0 U z M c Zc 'l4.J 4 4 1 10.8 32.9 37.3 19.0 5.3 53.1 1.4 20.8 0.4 19.0 9,290 2,310 2,620 2,740 1.53 D-74890 2 13.0 32.1 36.4 18.5 5.4 51.8 1.3 22.7 .3 18.5 9,070 (Hole 1) 3 36.9 41.8 21.3 4.6 59.5 1.5 12.7 .4 21.3 10,420 4 46.9 53.1 5.8 75.6 2.0 16.1 .5 13,240 1 9.5 30.9 33.2 26.4 4.9 48.0 1.2 19.2 .3 26.4 8,400 2,330 2,620 2,840 1.61 D-74891 2 12.1 30.0 32.2 25.7 5.0 46.7 1.2 21.1 .3 25.7 8,160 (Hole 1) 3 34.1 36.7 29.2 4.2 53.1 1.4 11.8 .3 29.2 9,280 4 48.2 51.8 5.9 75.0 1.9 16.8 .4 13,100 1 D-99651 2 10.2 30.9 38.1 20.8 .2 9,140 2,570 2,690 2,890 (Hole 2) 3 34.5 42.3 23.2 .3 10,180 4 44.8 55.2 ___.3 13,250 1/ 2/ 3/ Pittsburgh laboratory number; see table FoLlowing ana logs tor description 1, Air-dried; 2, as received; 3, moisture-free; 4, moisture- and ash-free. Determined by modified method. ot samples. Description of drill-core samples, Houston project: Lab. No. D-74890: Hole 1; core logged 27 feet 3 inches to 30 feet 3 inches; core received 32 inches;. 3-3/4 inches bone rejected; 4 inches coal loss in drilling; 28-1/4 inches coal in this sample. Lab. No. D-74891: Hole 1; core logged 33 feet 1 inch to 35 feet 8 inches; core received 30 inches; 6-1/2 inches bone rejected, 1 inch bone loss in drilling; 23-1/2 inches coal in this sample. Lab. No. D-99651: Hole 2; core logged 437 feet 6-1/2 inches to 441 feet 0 inch; core received 41-1/2 inches; 8-1/2 inches bone rejected; 33 inches coal in this sample. Ft. Del From- 0 ., 11 22 23 27 27 30 30 30 31 31 32 32 33 0 12 As a basis for calculating tons of coal in place, the common factor for Alaskan subbituminous coals is 1 ton of mined raw coal (plant feed) per cubic yard in place in the mine. Two beds known to average 42 inches and more are the "pit" bed and a bed lying approximately 250 feet (stratigraphically) below. Other beds are simply grouped in the category "14 inches and more"; 2 of these may be 42 or more inches thick; however, the minability of the beds should not be inferred without more thorough investigation. On the above basis, the total amount of coal in the drilled area is estimated to be as follows: Tons in place Pit bed, average 5 ft. of coal .................... 2,580,000 250 bed, average 4 ft. of coal.................... 2,000,000 Otheri/, average total, 19 ft., 6 in. .............. 10000000 Total .... .................................. 14,580,000 1/ Appearance and specific gravity comparable to pit product. Study of the drilling logs, projection of the limited geologic evidence, and consolidation of known historical evidence in this locality indicates that investi- gation to the southeast for 1/2 to 1 mile might expose strippable beds amenable to more economical mining. As noted in the logs and elsewhere in this report, a con- siderable quantity of gas was encountered at a well-defined horizon in holes 1 and 2. Study of this phenomenon was beyond the scope of this investigation. The gas was predominantly methane. APPENDIX Log, Drill Hole 1 Location: 832.5 feet S. and 1,080 feet W. of NE. corner, sec. Seward Meridian, Houston, Alaska. 20, T. 18 N., R. 3 W., Elevation: Collar of hole -303 feet. In. 0 9 1 3 4% 3 9 6 9 2% 4 1 Ft. )th To- 11 22 23 27 27 30 30 30 31 31 32 32 33 35 In. 0 9 1 3 4% 3 9 6 9 2% 4 1 12 Clay overburden. ; Material Interbedded fine sandstone and silty claystone. Ironstone. Interlaminated fine sandstone and silty claystone. Bone. COAL, dull; thin anthraxylon bands and lenses. Bone. Ft. 11 Thickness 11 4 2 1 0 In. 9 4 2 1% 84 2' 6 9 3 51 1% 9 11% t Remarks Thin glacial cover previously stripped. Roof, "Pit" bed. Core loss, 4 in. Core loss, 7 in. Shale, dark gray, coaly streaks Claystone, dark gray, coaly I Shale, dark gray, carbonaceous. COAL, dull, thin anthraxylon lenses. Shale, dark gray, carbonaceous. Claystone, coaly. COAL, dull; thin anthraxylon streaks and lenses. Ft. 35 35 35 38 39 43 46 47 49 52 52 53 53 75 From- 77 80 81 82 86 86 87 90 92 99 109 242 243 258 296 300 302 312 322 323 332 Depth Y2 3 8 0 4 7 8 0 2 2 5 3 8 2 In. 13 Hole 1 (Con.) 35 35 38 39 43 46 47 49 52 52 53 53 75 77 Ft. To- 80 81 82 86 86 87 90 92 99 109 242 243 258 296 300 302 312 322 323 332 333 In. 3 8 0 4 7 8 0 2 2 5 3 8 2 2 10 8 1 2 5 9 5 1 6 6 0 9 9 9 5 6 8 11 7 2 10 Bone, broken. Bone. Claystone, fel Claystone, co. Clays tone. Claystone, si Ironstone. Claystone. Claystone, si Ironstone, coI Claystone, si Bone. Claystone, si. Sandstone, me, upper and lot Claystone, si: Sandstone, sit Claystone, si' Sandstone, si: Claystone, si: Sandstone, si: Claystone. Claystone, si: Ity. dium, grading wer strata. lty. lty. Ity. lty. lty. Ity. Material.., ,,,, .] w coaly streaks. aly. lty streaks. lty streaks. ncretionary. lty. into Ity; sandy streak. 0 Ft. and coal fragments. Claystone, silty; occasional coaly fragments Sandstone, clayey matrix. Sandstone, soft, medium to fine, containing multiple beds 2 1 4 3 2 3 21 2 3 4 1 2 1 7 10 132 1 15 38 3 2 10 10 8 1 Thicknes In. 5 4 4 3 1 4 2 0 3 10 5 6 0 4 of hard pebbles (quartz, chert rhyolite, felsite, basalt) and occasional coal fragments. Claystone, bone streaks. Claystone, silty Interbedded fine sandstone, siltstone, and claystone; occasional coaly streaks. Claystone, coaly; many bright- coal bands. Claystone, coaly; few bright- coal bands up to 1 in. thick. Interbedded claystone and silt- stone; occasional coaly fragments. Siltstone, sandy streaks. Claystone, coaly. Interbedded siltstone and fine sandstone. Interbedded siltstone and claystone. Remarks Core loss, 1 in. Floor, "Pit" bed. Bedding almost hori- zontal; infrequent crossbedding. Core loss, 2 ft. 5 in. Core loss, 111 ft. Core loss, 2 ft. Core loss, 1 ft. Core loss, 2 in. U Ft. 333 334 334 335 336 341 341 342 345 351 353 353 372 376 387 387 388 393 394 402 403 435 453 456 471 De From- In. -L 10 5 9 2 14 Hole 1 (Con.) Ft. 334 334 335 336 341 341 342 345 351 353 353 372 376 387 387 388 393 394 402 403 435 453 456 471 481 )tn- To- In. 5 9 2 0 Material Siltstone. Shale, soft, dark. Claystone. Shale, soft, dark, occasional coal fragments. Interbedded siltstone and fine sandstone. Sandstone, soft. Interbedded siltstone and fine sandstone. Sandstone, soft. Interbedded siltstone and claystone. Claystone, soft, dark. Siltstone. Interbedded claystone, silt- stone, and fine sandstone. Sandstone, soft. Interbedded claystone and shale, silty streaks. COAL, hard, bright; conchoidal fracture. Claystone, coaly. Claystone, silty streaks. COAL, hard, bright, bony streaks. Interbedded claystone and siltstone. Sandstone, medium fine. Sandstone, medium fine; soft layers and occasional coaly Ft. Thickness .-- .... ... . 0 5 2 6 1 18 4 10 1 5 7 1 32 17 3 14 10 7 4 5 10 2 7 6 11 3 7 6 6 9 9 1 1 0 8 9 3 6 6 0 9 6 In.Remarks Core loss, 6 in. 4 10 10 4 4 1 4 4 1 7 streaks. Sandstone, bands. Sandstone, Sandstone, cemented. soft, few pebble soft, medium fine. porous, poorly Core loss, 16 ft. 2 in. Core loss, 8 ft. 9 in. Gas flow accompanied by brackish water, static pressure in excess of 15 lb. per sq. in. Bedding remains almost horizontal; little dis- tortion evident. l Sandstone, alternating soft and dense, pebble bands, bot- tom of hole in hard, fine sandstone. -^--.-- Ft. 0 19 21 21 From- 33 80 105 106 115 116 126 129 173 175 176 181 182 183 184 186 186 204 205 241 244 260 310 313 Deoth 15 Log, Drill Hole 2 Location: 710 feet S. and 2,150 feet E. of NW. corner, sec. 20, T. 18 N., R. 3 W., Seward Meridian, Houston, Alaska. Elevation: Collar of hole -330 feet. 0 0 6 11 In. 19 21 Ft. 21 33 80 105 106 115 116 126 129 173 V 4 175 176 181 182 183 184 186 186 204 205 241 244 260 310 313 320 Tn- In. 0 6 11 6 0 2 0 9 3 2 0 3 1 7 9 3 7 9 4 11 5 2 2 2 9 3 4 9 Material Overburden, soil and gravel. Sandstone, medium coarse; iron stains. Shale, carbonaceous. Interbedded silty claystone and siltstone. Sandstone, soft, occasional pebble bands and coaly streaks. Claystone, occasional iron- stone nodules, coal fragments. Siltstone, dense Claystone. Siltstone, dense. Claystone. Claystone, coaly, frequent coal bands. Interbedded claystone, silt- stone, and very fine sand- stone; occasional pebbles and coaly streaks. Interbedded bony coal and coaly claystone. COAL, dull; bony streaks. Claystone; coal streaks and fragments. Claystone, coaly. COAL, dull; bony streaks. Shale, dark, coal streaks. Claystone. Claystone, coal streaks. Claystone, siltstone bands, and very fine sandstone bands. Shale, dark; coal streaks. Interbedded claystone, silt- stone and very fine sandstone. Sandstone, soft. Claystone, silty; few sandy streaks. Sandstone, soft, occasional pebble bands. Conglomerate, pebble; soft sandstone matrix. Sandstone, soft to dense. Thickness Ft. 19 2 11 46 25 9 9 2 44 1 1 5 1 1 1 17 36 3 16 49 3 7 In. 5 7 6 2 10 9 6 11 10 3 10 6 2 6 4 2 7 7 6 9 0 0 7 6 1 5 0 6 Bedding, where seen, almost horizontal. Core broken, pseudo- coal bed. Roof, "Pit" bed. Floor, "Pit" bed. Core loss, 2 ft. 3 in. Remarks 3 4 Ft. Ue From- 320 340 342 372 -.1. 3 76 383 399 412 432 435 435 435 436 437 437 438 438 440 440 441 441 445 461 461 461 462 462 463 477 484 508 509 511 16 Hole 2 (Con.) 7 9 In. 10 6 11 7 0 4 2% 4 9 10% 1X 6% /2 3 2 8 0 3 7 3 9 11 1 11 8 0 0 1 10 5 342 372 376 383 399 412 432 435 435 435 436 437 437 438 438 440 440 441 441 445 461 461 461 462 462 463 477 484 508 509 511 511 To-To- Ft. 340 11 7 10 7 0 4 2% 4 9 10l 1% 6% 3 2 8 0 3 7 3 9 11 1 11 8 0 0 1 10 5 8 6 In. Sandstone, dense; rew peDbbes and cobbles. Conglomerate, pebble, in soft sandstone matrix. Claystone, silty bands, occasional ironstone concre- tions and coaly streaks. Sandstone, soft, fine to medium. Claystone to silty claystone, occasional ironstone con- cretions. Claystone, carbonaceous; coal fragments. Sandstone, soft; few pebbles | 19 and occasional claystone bands and coaly fragments. Sandstone, soft. 2 Conglomerate, pebble and 29 cobble, soft sandstone matrix. Material Ft. COAL. Siltstone. Bone. COAL. Bone. COAL. Bone. Bone, coal streaks. Bone. COAL. Bone. Claystone, coal streaks. Interbedded claystone, silt- stone, and very fine sand- stone. Sandstone. Claystone. Sandstone, soft. Claystone. Claystone, coaly. Claystone, occasional sandy streaks. Sandstone, crossbedded, fine medium, few clay streaks. Claystone to silty claystone. Sandstone, soft. Claystone. Claystone, coaly. 4 6 15 13 19 3 9 In. Thickness 1 1 4 15 13 7 24 1 1 5 8 3 9 5 4 5 1% 2¼< 5 6 2% 11 6 4 3 4 8 6 2 2 10 9 4 0 1 9 7 3 Remarks Bedding where seen nearly horizontal. Core loss, 2 ft. Roof of bed corres- ponding to log, hole 1, 296 ft. 9 in. to 302 ft. 6 in. Floor. Bedding nearly flat. to Ft. From- I Depth * 511 533 533 543 545 571 605 610 648 652 666 675 692 697 726 728 729 730 733 735 740 742 744 753 805 832 |In. 17 Hole 2 (Con.) 0 8 0 3 11 0 4 4 10 3 0 0 0 3 2 7 11 7 7 7 8 6 3 11 8 To- 533 533 543 545 571 605 610 648 652 666 675 692 697 726 728 729 730 733 735 740 742 744 753 805 832 837 Ft. 0 8 0 In. 3 11 0 4 4 10 3 0 0 0 3 2 7 11 7 7 7 8 6 3 11 Material Claystone and fine sandstone, interbedded and crossbedded. COAL, bony. Interbedded claystone and fine sandstone. _ _ _ _ - Sandstone. Conglomerate, pebble to soft sandstone matrix. Sandstone, soft. Conglomerate, pebble to soft sandstone matrix. Thickness banasUone, claystone incluslons Sandstone, dense; calcite- filled fractures. Conglomerate, soft matrix. Dense sandstone, coaly fragments. Conglomerate, soft matrix. Claystone, silty. Claystone, silty; few bands of fine sandstone and occasional ironstone concretions and coaly streaks. Claystone, coaly. Claystone. Claystone, coaly. Interbedded claystone and fine sandstone. Claystone, coal streaks. Claystone, sandy streaks, and lenses. 26 cobble, 33 5 cobble, 38 21 9 .2 Ft. 4 13 8 17 5 29 1 1 1 2 2 5 In. 8 4 3 8 1 4 0 6 5 9 0 0 3 11 5 4 8 0 0 1 10 9 8 10 3 4 Remarks Transition. Bedding 15°, brackish water with evident gas pressure. Core loss, 28 ft. 8 in. Core loss, 2 ft. 1 in. Core loss, 30 ft. 9 in. Slickensides. Core loss, 12 ft. 11 in. Core loss, 7 ft. 1 in. Core loss, 12 ft. 9 in. Core loss, 7 in. Gas and water increasing down to this stratum. Static pressure up to 45 lb. Another gas channel apparent at 775 ft.; not measurable. I f Sandstone, fine to medium cross- 2 bedded; coaly streaks and occasional included pebbles. Claystone, coaly. 1 Interbedded claystone and fine 8 sandstone. Sandstone, fine to medium and 52 dense to porous, occasional claystone blebs, and pebble band at 794 ft. Claystone, silty and sandy 26 streaks. Sandstone, soft; claystone and 4 coaly streaks. 9 09 Ft. 837 840 843 847 848 850 876 876 880 895 897 Frnm- 903 906 913 917 937 943 979 985 985 986 987 987 988 988 1,013 1,044 Depth U 9 3 18 Hole 2 (Con.) 10 3 8 0 6 8 8 10 IIn. 840 843 847 848 850 876 876 880 895 897 903 Ft. 906 913 917 937 943 979 985 985 986 987 987 988 988 1,013 1,044 1,072 3 8 0 6 8 8 In. 9 3 10 8 To- 10 Material Claystone, sandy and coaly streaks. Claystone, coaly; many bright coal bands. Sandstone, soft; occasional claystone streaks. Claystone. Claystone, dark; bright coal streaks. Interbedded claystone and silt- stone. Sandstone, crossbedded; streaks of iron carbonate. Claystone, dark; occasional coal streaks. Interbedded claystone and silty claystone. Sandstone, fine, dense. Interbedded claystone and siltstone. Claystone, coaly. Interbedded claystone, silt- stone, and fine sandstone. Claystone, coaly; bright streaks. Interbedded claystone and silt- stone; occasional ironstone concretions. Claystone, coaly; many bright coal bands and streaks. Interbedded claystone, silt- stone, and fine sandstone; occasional ironstone con- cretions. Sandstone. COAL, bony and bright. Claystone, coaly. COAL, bright. COAL, bony and bright. COAL. Claystone, coaly. Interbedded claystone and silt- stone; 3-ft. zone of ironstone concretions at 994 ft. Sandstone, fine to medium; occasional claystone streaks. Sandstone; frequent conglom- erate lenses of indeterminate thickness. 3 Chickness 2 4 2 25 4 15 2 5 2 7 4 19 6 35 6 1 25 30 27 Ft.In. 6 7 5 5 4 6 2 0 2 10 5 5 2 11 0 5 0 9 5 0 3 8 5 2 10 6 9 Remarks I Tv Bedding of all above strata varies from 0° to 15°.i Core mangled; no loss. C 43 48 5C 51 53 53 53 55 58 60 87 87 90 96 97 I 0 6 6 5 11 2 5 7 0 7 4 6 9 10 11 6 48 50 51 53 53 53 55 58 60 87 87 90 96 97 103 103 122 123 125 126 126 126 19 Hole 2 (Con.) I t De th .. From- To- Thickness Ft. In. Ft. In. Material Ft. In. Remarks 1,072 0 1,097 1 Interbedded claystone and 25 1 silty claystone. 1,097 1 1,105 10 Claystone, dark; frequent 8 9 bright-coal streaks and scattered sandstone con- cretions. 1,105 10 1,106 2 Claystone. 4 1,106 2 1,112 3 Interbedded claystone, silt- 6 1 stone, and fine sandstone. 1,112 3 1,142 0 Sandstone, occasional clay- 29 9 _ stone streaks. Log, Drill Hole 3 Location: 920 feet N. and 265 feet W. of SE. corner, sec. 18, T. 18 N., R. 3 W., Seward Meridian, Houston, Alaska. Elevation: Collar of hole -249 feet. .43 -i,,, -.-43 6 5 11 2 5 7 0 7 4 6 9 10 11 6 0 11 4 6 Overburden, glacial sand, gravel, and boulders. Sandstone, dense, few included pebbles and cobbles. Claystone. Claystone, soft. Shale, dark. Claystone, coaly. Claystone, coaly streaks. Claystone, coaly. Claystone, dark, silty; occasional coaly streaks. COAL, bony. Interbedded claystone, silty claystone and siltstone. Sandstone. Claystone. Sandstone, porous, fine to medium, frequent clay bands. Sandstone, dense, fine. Claystone, silty, grading down to siltstone. COAL, bony. Interbedded claystone and silty claystone; occasional sandy streaks. Shale, carbonaceous. Claystone. Claystone, coaly. Claystone. Claystone, coaly. 1 3 1 27 3 6 5 18 2 43 5 1 1 1 6 0 11 6 3 3 2 5 7 9 2 3 1 1 7 6 11 5 8 2 10 1 5 Core loss, 3 ft. 4 in. Core loss, 9 in. Core loss, 1 ft., 2 in. 103 103 122 123 125 126 126 0 11 4 0 2 0 1 0 2 0 1 6 Ft. 126 127 127 133 142 145 177 181 182 196 199 217 224 233 236 243 244 244 256 258 260 333 337 From- In. Depth 6 0 11 5 10 8 3 Ft. 20 Hole 3 (Con.) 127 127 133 1 To- 42 145 177 181 182 196 199 217 224 233 236 243 244 244 256 258 260 333 337 386 In. 0 11 5 10 Claystone. Claystone, coaly. Claystone, dark; frequent coal streaks. Claystone to silty claystone, occasional coaly fragments. Interbedded coaly claystone and carbonaceous shale. Interbedded claystone, silty claystone, and very fine sandstone. Interbedded claystone and soft, porous sandstone. Claystone, coaly. Claystone, frequent silty and coaly streaks. Claystone, coaly. Claystone, occasional silty streaks. Sandstone, fine. Claystone. Claystone, coaly. Claystone, occasional thin coaly streaks. COAL, bony. Shale, carbonaceous. Claystone, occasional coaly fragments and ironstone nodules. Claystone, coaly. Shale, dark; few thin coaly streaks. Interbedded claystone, silt- stone, and very fine sand- stone. Sandstone, soft. Sandstone, soft, few pebbles included. ly IThickness 5 9 2 31 4 13 3 18 6 9 3 6 1 11 2 1 72 3 49 Material Ft. 0 6 11 6 In.Remarks Core loss, 1 ft. Core loss, 1 ft. 2 in. Core loss, 42 ft. Bedding throughout is 0° to 150, with mod- erate crossbedding. Regular bedding seldom exceeds 5°. .-..--.---.I .. INT. BU.OF MINES.PGH* ,rA .8485 0 lc-apfm l0jan95 PLUGGING & LOCATION CLEARANCE REPORT State of Alaska ALASKA OIL & GAS CONSERVATION COMMISSION PTD No. 00 CJ ©(O Lease ? Memorandum To File: API No. 009 - X00 24 Well Name /-(o(ss 0e) Operator (QS l-cir 1 a Location Se C l 8 xl tZ �A 1 Ski Abnd Date Spud: TD: 3,56 Completed 8 !� Note casing size, wt, depth, cmt vol, & procedure. Sfc Csg: Long Csg: Liner: Perf intervals - tops: Review the well file, and comment on plugging, well head status, and location clearance - provide loc. clear. code. Plugs: Well head cut off: Marker post or plate: Location Clearance: Conclusions: 10 5 c�t7iZ ,°p,-� L Code Signed Date 21279 S— • Log, hole 1 Location: 1,665 feet S. and 2,160 feet W. of NE. corner Sec. 20, T. 18 N., R. 3 W., Seward Meridian, Houston, Alaska. Elevation: Collar of hole - 303 feet. Depth S NEp JUL 16 2007 From- To- Thickness Ft. in. Ft. in. Material Ft. in. Remarks 0 0 11 0 Clay overburden 11 0 Thin glacial cover previously stripped. 11 0 22 9 Interbedded fine sandstone and silty claystone 11 9 22 9 23 1 Ironstone 0 4 23 1 27 3 Interlaminated fine sandstone, siltstone and silty claystone 4 2 Roof, "Pit" bed. 27 3 27 42 Bone 0 12 27 42 30 0-3/4 COAL, dull with thin anthraxylon bands and lenses 2 84 Core loss, 4 in. 30 0-3/4 30 3 Bone 0 2u 30 3 30 9 Shale, dark gray, coaly streaks 0 6 30 9 31 6 Claystone, dark gray, coaly 0 9 Core loss, 7 in. 31 6 31 9 Shale, dark gray, carbonaceous 0 3 31 9 32 22 COAL, dull, thin anthraxylon lenses 0 5T 32 22 32 4 Shale, daxk gray, carbonaceous 0 12 32 4 33 1 Claystone, coaly 0 9 33 1 35 02 COAL, dull with thin anthraxylon streaks and lenses 1 lid 35 02 35 3 Bone, broken 0 2z Core loss, 1 in. 35 3 35 8 Bone 0 5 35 8 38 0 Claystone, few coaly streaks 2 4 Floor, "Pit" bed. 38 0 39 4 Claystone, coaly 1 4 39 4 43 7 Claystone 4 3 43 7 46 8 Claystone, silty streaks 3 1 46 8 47 0 Ironstone 0 4 47 0 49 2 Claystone 2 2 49 2 52 2 Claystone, silty streaks 3 0 52 2 52 5 Ironstone, concretionary 0 3 52 5 53 3 Claystone, silty 0 10 53 3 53 8 Bone 0 5 53 8 75 2 Claystone, silty 21 6 Bedding is almost 75 2 77 2 Sandstone, medium, grading into horizontal, with upper and lower strata. 2 0 infrequent cross - 77 2 80 10 Claystone, silty 3 8 bedding. 80 10 81 8 Sandstone, silty 0 10 81 8 82 1 Claystone, silty 0 5 82 1 86 2 Sandstone, silty 4 1 86 2 86 5 Claystone, silty 0 3 86 5 87 9 Sandstone, silty 1 4 87 9 90 5 Claystone 2 8 90 5 92 1 Claystone, silty, with sandy streaks and coal fragments 1 8 100 - poll , 100 -cxj9 t oy • Log, hole I (Cont.) • Remarks Core loss 2 ft. 5 in. Core loss 111 ft. Core loss 2 ft. 0 in. Core loss 1 ft. 0 in. Core loss 2 in. Core loss 6 in. Depth From- To- Thickness Ft. in. Ft. in. Material Ft. in. 92 1 99 6 Claystone, silty, with occasional coaly fragments 7 5 99 6 109 6 Sandstone, clayey matrix 10 0 109 6 242 0 Sandstone, soft, medium to fine, containing multiple beds of hard pebbles (quartz, chert, rhyolite, felsite, basalt) and occasional coal fragments 132 6 242 0 243 9 Claystone, bone streaks 1 9 243 9 258 9 Claystone, silty 15 0 258 9 296 9 Interbedded fine sandstone, siltstone and claystone with occasional coaly streaks 38 0 296 9 300 5 Claystone, coaly, with many bright coal bands 3 8 300 5 302 6 Claystone, coaly, with few bright coal bands up to 1 in. thick 2 1 302 6 312 8 Interbedded claystone and siltstone, with occasional coaly fragments 10 2 312 8 322 11 Siltstone, sandy streaks 10 8 11 323 7 Claystone, coaly 322 323 7 332 2 Interbedded siltstone and fine sandstone 8 7 332 2 333 10 Interbedded siltstone and claystone 1 8 333 10 334 5 siltstone 0 7 334 5 334 9 Shale, soft, dark 0 4 334 9 335 2 Claystone 0 5 335 2 336 0 Shale, soft, dark, occasional coal fragments 0 10 336 o 341 2 Interbedded siltstone and fine sandstone 5 2 341 2 341 9 Sandstone, soft 0 7 341 9 342 3 Interbedded siltstone and fine sandstone 0 6 342 3 345 2 Sandstone, soft 2 11 345 2 351 5 Interbedded siltstone_and _ claystone 6 3 351 5 353 0 Claystone, soft, dark 1 7 353 0 353 6 Siltstone 0 6 353 6 372 0 Interbedded claystone, siltstone and fine sandstone 18 6 372 0 376 9 Sandstone, soft 4 9 376 9 387 6 Interbedded claystone and shale, silty streaks 10 9 387 6 387 7 COAL, hard, bright, with conchoidal fracture 0 1 Remarks Core loss 2 ft. 5 in. Core loss 111 ft. Core loss 2 ft. 0 in. Core loss 1 ft. 0 in. Core loss 2 in. Core loss 6 in. 471 1 481 7 Sandstone, alternating soft and dense, pebble bands - bottom of hole in herd, Fine sandstone Log, hole 2 Remarks el Core loss 16 ft. 2 in. Core loss 8 ft. 9 in. Gas flow accompanied by brackish water - static -pressure in excess of 15 lbs. per sq. in. 10 6 Bedding remains al- most horizontal - little distortion evident. Location: 710 feet S. and 2,150 feet E. of 14W. corner Sec. 20, T. 18 N., R. 3 W., Log, hole 1 (Cont.) Elevation: Collar of Depth Depth From- To- From-- Thickness Ft. in. Ft. in. Material Ft. in. 387 7 388 8 Claystone, coaly 1 1 388 8 393 8 Claystone, silty streaks 5 0 393 8 394 4 COAL, hard, bright, with with iron stains 2 6 21 bony streaks 0 8 394 4 402 1 Interbedded claystone and 33 6 Interbedded silty claystone siltstone 7 9 402 1 403 4 Sandstone, medium -fine 1 3 403 4 435 10 Sandstone, medium fine, with pebble bands and coaly soft layers and occasional streaks 46 6 Bedding, where seen, coaly streaks 32 6 435 10 453 4 Sandstone, soft, with few 105 2 Claystone, occasional iron- pebble bands 17 6 453 4 456 4 Sandstone, soft, medium -fine 3 0 456 4 471 1 Sandstone, porous, poorly cemented 14 9 471 1 481 7 Sandstone, alternating soft and dense, pebble bands - bottom of hole in herd, Fine sandstone Log, hole 2 Remarks el Core loss 16 ft. 2 in. Core loss 8 ft. 9 in. Gas flow accompanied by brackish water - static -pressure in excess of 15 lbs. per sq. in. 10 6 Bedding remains al- most horizontal - little distortion evident. Location: 710 feet S. and 2,150 feet E. of 14W. corner Sec. 20, T. 18 N., R. 3 W., Seward Meridian, Houston, Alaska.. Elevation: Collar of hole - 330 feet. Depth From-- TO: Thickness Ft. in, Ft, in. Material. Fts 7n. Remarks 0 0 19 0 Overburden, soil and gravel 19 0 19 0 21 6 Sandstone, medium -coarse, with iron stains 2 6 21 6 21 ll Shale, carbonaceous 0 5 21 11 33 6 Interbedded silty claystone and siltstone 11 7 33 6 80 0 Sandstone, soft, occasional pebble bands and coaly streaks 46 6 Bedding, where seen, almost horizontal. 80 0 105 2 Claystone, occasional iron- stone nodules, coal fragments 25 2 Log, hole 2 (Cont.) Depth From- To- Thickness Ft. in. Ft. in. Material Ft. in. Remarks 105 2 106 0 Siltstone, dense 0 10 l06 0 115 9 Claystone 9 9 115 9 116 3 Siltstone, dense 0 6 11.6 3 126 2 Claystone 9 2- 126 2 129 0 Claystone, coaly, frequent coal bands 2 10 Core broken, pseudo - coal bed. 129 0 173 3 Interbedded claystone, siltstone and very fine sandstone, with occasional pebbles and coaly streaks 44 3 Roof, "Pit" bed. 173 3 175 1 Interbedded bony coal and coaly claystone 1 10 175 1 176 7 COAL, dull with bony streaks 1 6 176 7 181 9 Claystone, with coal streaks and fragments 5 2 181 9 182 3 Claystone, coaly. 0 6 182 3 183 7 COAL, dull with bony streaks 1 4 183 7 184 9 Shale, dark, coal streaks 1 2 Floor, "Pit" bed. 184 9 186 4 Claystone 1 7 186 4 186 11 Claystone, coal streaks 0 7 186 11 204 5 Claystone, siltstone bands and very fine sandstone bands 17 6 204 5 205 2 Shale, dark, with coal streaks 0 9 205 2 241 2 Interbedded claystone, siltstone and very fine sandstone 36 0 241 2 244 2 Sandstone, soft 3 0 244 2 260 9 Claystone, silty with few sandy streaks 16 7 260 9 310 3 Sandstone, soft, occasional pebble bands 49 6 310 3 313 4 Conglomerate, pebble with soft sar.astone matrix 3 1 Core loss 2 ft. 3 in. 313 4 320 9 Sandstone, soft to dense 7 5 320 9 340 6 Sandstone, soft, with few pebbles and occasional claystone bands and coaly fragment„ 19 9 340 6 342 11 Sandstone, soft 2 5 342 11 372 7 Conglomerate, pebble and cobble, soft sandstone matrix 29 8 372 7 376 10 Sandstone, dense with few pebbles and cobbles 4 3 Bedding, where seen, nearly horizontal 376 10 383 7 Conglomerate, pebble, in soft sandstone matrix 6 9 • Log, hole 2 (Cont.) Material Claystone, silty bands, occasional ironstone concretions and coaly streaks Sandstone, soft fine to medium Claystone to silty claystone, occasional ironstone concretions Claystone, carbonaceous, with coal fragments 435 4 Depth 9 COAL From- 9 To - Ft. in. Ft. in. 383 7 399 0 399 0 412 4 412 4 432 22 432 22 435 4 • Log, hole 2 (Cont.) Material Claystone, silty bands, occasional ironstone concretions and coaly streaks Sandstone, soft fine to medium Claystone to silty claystone, occasional ironstone concretions Claystone, carbonaceous, with coal fragments 435 4 435 9 COAL 435 9 435 102 Siltstone 435 102 436 0-3/4 Bone 436 0-3/4437 11 COAL 437 437 11 437 6T Bone 61 438 02 COAL 438 o2 438 3 Bone 438 3 440 2 Bone with coal streaks 44o 2 440 8 Bone 440 8 441 0 COAL 441 0 441 3 Bone 441 3 445 7 Claystone, coal streaks 445 7 461 3- Interbedded claystone, siltstone and very fine sandstone 461 3 461 9 Sandstone 461 9 461 11 Claystone 461 11 462 1 Sandstone, soft 462 1 462 11 Claystone 462 11 463 8 Claystone, coaly 463 8 477 0 Claystone, occasional sandy streaks 477 0 484 0 Sandstone, cross -bedded, fine to medium, few clay streaks 484 0 508 1 Claystone to silty claystone 508 1 509 10 Sandstone, soft 509 10 511 5 Claystone 511 5 511 8 Claystone, coaly 511 8 533 0 Claystone and fine sandstone, interbedded and cross -bedded 533 0 533 8 COAL, bony 533 8 543 0 Interbedded claystone and fine sandstone 543 0 545 3 Sandstone, claystone inclusions �J Thickness Ft. in. Remarks 15 5 13 4 Core loss 2 ft. 0 in. 19 102 3 12 Roof of bed corres- ponding to log, hole 1, 296 ft. 9 in. to 302 ft. 6 in. 0 5 0 11 0 2, 1 0-3/41- 0 -3/40 5 o 6 0 22 1 11 o 6 o 4 0 3 4 4 Floor 15 8 o 6 0 2 0 2 0 10 0 9 13 4 Bedding nearly flat. 7 0 24 1 1 9 1 7 0 3 21 4 0 8 �3 2 3 Transition • Log, hole 2 (Cont.) • 3 Depth From- To- Thickness Ft. in. Ft. in. Material Ft. in. Remarks 545 3 571 Sandstone 26 8 Bedding 15 degrees. Brackish water with evident gas pressure. 571 11 605 0 Conglomerate, pebble to cobble, soft sandstone matrix 33 1 Core loss 28 ft.8 in. 605 0 610 4 Sandstone, soft 5 4 Core loss 2 ft. 1 in. 610 4 648 4 Conglomerate, pebble to cobble, soft sandstone matrix 38 0 Core loss 30 ft.9 in. 648 4 652 10 Sandstone, dense, with calcite -filled fractures 4 6 Slickensides 652 10 666 3 Conglomerate, soft matrix 13 5 Core loss 12 ft.11 in. 666 3 675 0 Dense sandstone with coaly fragments 8 9 Core loss 7 ft. 1 in. 675 0 692 0 Conglomerate, soft matrix 17 0 Core loss 12 ft -9 in. 692 0 697 0 Claystone, silty 5 0 Core loss 0 ft. 7 in. Gas and water increas- ing down to this stratum. Static pres- sure up to 45 pounds. 697 0 726 3 Claystone, silty, with few bands of fine sandstone and occasional ironstone con- cretions and coaly streaks 29 3 726 3 728 2 Claystone, coaly 1 11 728 2 729 7 Claystone 1 5 729 7 730 11 Claystone, coaly 1 4 730 11 733 7 Interbedded claystone and fine sandstone 2 8 733 7 735 7 Claystone, coal streaks 2 0 735 7 740 7 Claystone, sandy streaks and lenses 5 0 740 7 742 8 Sandstone, fine to medium, cross -bedded, with coaly streaks and occasional included pebbles 2 1 742 8 744 6 Claystone, coaly 1 10 744 6 753 3 Interbedded claystone and fine sandstone 8 9 753 3 805 11 Sandstone, fine to medium and dense to porous, with occasional claystone blebs, and pebble band at 794 ft. 52 8 Another gas channel apparent at 775 ft., not measurable. 805 11 832 9 Claystone, silty and sandy streaks 26 10 3 • Thickness Ft. in. 4 3 3 9 2 6 4 7 0 5 2 5 25 4 o 6 4 2 15 0 2 2 5 10 2 5 7 5 4 2 19 11 6 o Remarks 35 5 Bedding of all above strata varies from 0 to 15 degrees 6 o 0 9 0 5 1 0 0 3 0 8 0 5 Log, hole 2 (Cont.) Depth From- To - Ft. in. Ft. in. Material 832 9 837 0 Sandstone, soft, with claystone and coaly streaks 837 0 840 9 Claystone, sandy and coaly streaks 84o 9 843 3 Claystone, coaly, with many bright coal bands 843 3 847 10 Sandstone, soft, with occasional claystone streaks 847 10 848 3 Claystone 848 3 85o 8 Claystone, dark, with bright coal streaks 85o 8 876 0 Interbedded claystone and siltstone 876 o 876 6 Sandstone, cross -bedded, with streaks of iron carbonate 876 6 88o 8 Claystone, dark, with occasional coal streaks 880 8 895 8 Interbedded claystone and silty claystone 895 8 897 10 Sandstone, fine, dense 897 10 903 8 Interbedded claystone and siltstone 903 8 906 1 Claystone, coaly 906 1 913 6 Interbedded claystone, siltstone and fine sandstone 913 6 917 8 Claystone, coaly, with bright coal streaks 917 8 937 7 Interbedded claystone and siltstone, with occasional ironstone concretions 937 7 943 7 Claystone, coaly, with many bright coal bands and streaks 943 7 979 0 Interbedded claystone, silt - stone and fine sandstone, with occasional ironstone concretions 979 0 985 0 Sandstone 985 0 985 9 COAL, bony and bright 985 9 986 2 Claystone, coaly 986 2 987 2 COAL, bright 987 2 987 5 COAL, bony and bright 987 5 988 1 COAL 988 1 988 6 Claystone, coaly • Thickness Ft. in. 4 3 3 9 2 6 4 7 0 5 2 5 25 4 o 6 4 2 15 0 2 2 5 10 2 5 7 5 4 2 19 11 6 o Remarks 35 5 Bedding of all above strata varies from 0 to 15 degrees 6 o 0 9 0 5 1 0 0 3 0 8 0 5 Depth From- To - Ft. in. Ft. in. 988 6 1013 8 1013 8 lo44 6 lo44 6 1072 0 1072 0 1097 1 1097 1 1105 10 1105 10 1106 2 1106 2 1112 3 1112 3 1142 0 • Log, hole 2 (Cont.) Material Interbedded claystone and siltstone, with 3 ft. zone of ironstone concretions at 994 ft. Sandstone, fine to medium, occasional claystone streaks Sandstone with frequent conglomerate lenses of indeterminate thickness Interbedded claystone and silty claystone Claystone, dark, with frequent bright coal streaks and scattered sandstone concretions Claystone Interbedded claystone, siltstone and fine sandstone Sandstone, occasional cla.ystoi?e streaks Log, hole 3 • Thickness Ft. in. Remarks 25 2 30 10 27 6 Core mangled, no loss. 25 1 8 9 0 4 6 1 29 9 Location: 920 feet N, and 265 feet W. of SE. corner. Sec. 18, T. 18 N., R. 3 W., Seward Meridian, Houston, Alaska Elevation: Collar of hole - 249 feet. Depth From- To- Thickness Ft. in. Ft. in. 0 0 43 6 43 6 48 6 48 6 50 5 51 11 53 2 53 5 53 7 55 0 58 7 6o 4 50 5 51 11 53 2 53 5 53 7 55 0 58 7 6o 4 87 6 Material Overburden, glacial sand, gravel and bo?3.lders Sandstone, dense, few included pebbles and cobbles Claystone Claystone, soft Shale, dark Claystone, coaly Claystone, coaly streaks Claystone, coaly Claystone, dark, silty, with occasional coaly streaks COAL, bony Interbedded claystone, silty claystone and siltstone Ft. in. Remarks 43 6 5 0 Core loss 3 ft. 4 in. 1 11 Core loss 9 in. 1 6 Core loss 1 ft. 2 in. 1 3 0 3 0 2 1 5 3 7 1 9 27 2 • Thickness Ft. in. 0 3 3 1 6 1 0 7 5 6 0 11 18 5 0 8 2 2 0 10 0 1 0 5 o 6 0 11 5 6 9 5 2 10 Remarks 31 7 4 5 Core loss 1 ft. 0 10 13 7 3 3 18 2 6 6 9 4 3 5 6 3 1 0 0 3 11 10 2 7 1 8 Log, hole 3 (Cont.) Depth From- To - Ft. in. Ft. in. Material 87 6 87 9 Sandstone 87 9 90 10 Claystone 90 10 96 11 Sandstone, porous, fine to medium, frequent clay bands 96 11 97 6 Sandstone, dense, fine 97 6 103 0 Claystone, silty, grading down to siltstone 103 0 103 11 COAL, bony 103 11 122 4 Interbedded claystone and silty claystone, with occasional sandy streaks 122 4 123 0 Shale, carbonaceous 123 0 125 2 Claystone 125 2 126 0 Claystone, coaly 126 0 126 1 Claystone 126 1 126 6 Claystone, coaly 126 6 127 0 Claystone 127 0 127 11 Claystone, coaly 127 11 133 5 Claystone, dark, with frequent coaly streaks 133 5 142 10 Claystone to silty claystone, occasional coaly fragments 142 10 145 8 Interbedded coaly claystone and carbonaceous shale 145 8 177 3 Interbedded claystone, silty claystone and very fine sandstone 177 3 181 8 Interbedded claystone and soft porous sandstone 181 8 182 6 Claystone, coaly 182 6 196 1 Claystone, frequent silty and coaly streaks 196 1 199 4 Claystone, coaly 199 4 217 6 Claystone, occasional silty streaks 217 6 224 0 Sandstone, fine 224 0 233 4 Claystone 233 4 236 9 Claystone, coaly 236 9 243 0 Claystone, occasional thin coaly streaks 243 0 244 0 COAL, bony 244 0 244 3 Shale, carbonaceous 244 3 256 1 Claystone, occasional coaly fragments and ironstone nodules 256 1 258 8 Claystone, coaly 258 8 260 4 Shale, dark, with few thin coaly streaks • Thickness Ft. in. 0 3 3 1 6 1 0 7 5 6 0 11 18 5 0 8 2 2 0 10 0 1 0 5 o 6 0 11 5 6 9 5 2 10 Remarks 31 7 4 5 Core loss 1 ft. 0 10 13 7 3 3 18 2 6 6 9 4 3 5 6 3 1 0 0 3 11 10 2 7 1 8 Depth From- To - Ft. in. Ft. in. 26o 4 333 1 333 1 337 0 337 0 386 o n Log, hole 3 (Cont.) Material Interbedded claystone, siltstone and very fine sandstone Sandstone, soft Sandstone, soft, few pebbles included • Thickness Ft. in. Remarks 72 9 3 11 Core loss 1 ft. 2 in. 49 0 Core loss 42 ft. Bedding throughout is 0 to 15 degrees, with moderate cross - bedding. Regular bedding seldom exceeds 5 degrees. 435 10 453 4 456 4 471 1 453 4 456 4 471. 1 IL Log, hole 1 (Cont.) .w Material Claystone, coaly Claystone, silty streaks COAL, hard, bright, with bony streaks Interbedded claystone and siltstone Sandstone, medium -fine Sandstone, medium fine, with soft layers and occasional coaly streaks Sandstone, soft, with few pebble bands Sandstone, soft, medium -rine Sandstone, porous, poorly cemented 481 7\ Sandstone, alternating soft and dense, pebble bands - \'� bottom of hole in heard, fine \ sandstone i Thickness Ft. in Remarks I. 5 ° 1: 0 8 �. 79 is 3e 6 17 6 Core lose 16 ft. 2 in. 3 0 14 9 Core loss 8 ft. 9 in.� Gas flow accompanied \ by brackish water - static pressure in excess of 15 lbs. per sq. in. 10 6 Bedding remains al- most horizontal - little distortion evident. Log, hole 2 c ke" 9-c Location: 710 feet S. and 2,150 feet E. of NW. corner Sec. 20, T. 18 N-, R. 3 W., Seward Meridian, Houston, Alaska. Elevation: Collar of hole - 330 feet. Doth DeRth From- -.. To - Ft. in. Ft. in. 387 7 388 8 388 8 393 8 393 8 394 4 394 4 402 1 4o2 1 403 4 403 4 - 435 10 435 10 453 4 456 4 471 1 453 4 456 4 471. 1 IL Log, hole 1 (Cont.) .w Material Claystone, coaly Claystone, silty streaks COAL, hard, bright, with bony streaks Interbedded claystone and siltstone Sandstone, medium -fine Sandstone, medium fine, with soft layers and occasional coaly streaks Sandstone, soft, with few pebble bands Sandstone, soft, medium -rine Sandstone, porous, poorly cemented 481 7\ Sandstone, alternating soft and dense, pebble bands - \'� bottom of hole in heard, fine \ sandstone i Thickness Ft. in Remarks I. 5 ° 1: 0 8 �. 79 is 3e 6 17 6 Core lose 16 ft. 2 in. 3 0 14 9 Core loss 8 ft. 9 in.� Gas flow accompanied \ by brackish water - static pressure in excess of 15 lbs. per sq. in. 10 6 Bedding remains al- most horizontal - little distortion evident. Log, hole 2 c ke" 9-c Location: 710 feet S. and 2,150 feet E. of NW. corner Sec. 20, T. 18 N-, R. 3 W., Seward Meridian, Houston, Alaska. Elevation: Collar of hole - 330 feet. Material Overburden, soil and gravel Sandstone, medium -coarse, with iron stains Shale, carbonaceous Interbedded silty claystone and siltstone Sandstone, soft, occasional pebble bands and coaly streaks Thickness Ft.--�in. Remarks ; 19 0 2 6 0 5 11 7 46 80 0 105 2 Claystone, occasional iron- stone nodules, coal fragments 25 6 Bedding, where seen, almost horizontal. 2 Doth From-- 'Too -- Ft. in, Ft. in. 0 0 19 0 19 0 21 6 21 6 21 ll 21 it 33 6 33 6 80 0 Material Overburden, soil and gravel Sandstone, medium -coarse, with iron stains Shale, carbonaceous Interbedded silty claystone and siltstone Sandstone, soft, occasional pebble bands and coaly streaks Thickness Ft.--�in. Remarks ; 19 0 2 6 0 5 11 7 46 80 0 105 2 Claystone, occasional iron- stone nodules, coal fragments 25 6 Bedding, where seen, almost horizontal. 2 Depth 129 0 173 3 175 1 176 7 181 9 182 3 183 7 184 9 186 4 186 31 204 5 205 2 241 2 244 2 260 9 310 3 313 4 320 9 34o 6 342 11 372 7 173 3 175 1 176 7 181 9 182 3 183 7 184 9 186 4 186 31 204 5 205 2 241 2 244 2 26o 9 310 3 313 4 320 9 34o 6 342 13. 372 7 376 to 376 10 383 7 • Log, hole 2 (Cont.) Material Siltstone, dense Claystone Siltstone, dense Claystone Claystone, coaly, frequent coal bands Interbedded claystone, siltstone and very fine sandstone, with occasional pebbles and coaly streaks Interbedded bony coal and coaly claystone COAL, dull with bony streaks Claystone, with coal streaks and fragments Claystone, coal -y COAL, dull with 'cony streaks Shale, dark, coal. streaks Claystone Claystone, coal streaks Claystone, sil-tstone bands and very fine sa.-Astone bands Shale, dark, with coal streaks Interbedded claystone, siltstone and very fine sandstone Sandstone, soft Claystone, silty with few sandy streaks Sandstone, soft, occasional pebble bands Conglomerate, pebble with soft sandstone matrix Sandstone, soft to dense Sandstone, soft, with few pebbles and occasional claystone bands and coaly fragments Sandstone, soft Conglomerate, pebble and cobble, soft sandstone matrix Sandstone, dense with few pebbles and cobbles Conglomerate, pebble, in soft sandstone matrix Thickness Ft. in. Remarks'"' 0 10 9 9 o 6 9 2 10 Core broken, paeudo- coal bed. 44 3 Roof, "Pit" bed. 1 10 1 6 5 2 o 6 1 4 1 2 Floor, "Pit" bed6 1 7 0 7 17 6 0 9 36 o 3 0 16 7 49 6 3 1 Core loss 2 ft -3 in. 7 5 19 9 2 5 29 8 4 3 Bedding, where seen, nearly horizontal 6 9 From- To - Ft, in. Ft. in. 105 2 106 o 106 0 115 9 315 9 116 3 316 3 126 2 ' 126 2 129 0 129 0 173 3 175 1 176 7 181 9 182 3 183 7 184 9 186 4 186 31 204 5 205 2 241 2 244 2 260 9 310 3 313 4 320 9 34o 6 342 11 372 7 173 3 175 1 176 7 181 9 182 3 183 7 184 9 186 4 186 31 204 5 205 2 241 2 244 2 26o 9 310 3 313 4 320 9 34o 6 342 13. 372 7 376 to 376 10 383 7 • Log, hole 2 (Cont.) Material Siltstone, dense Claystone Siltstone, dense Claystone Claystone, coaly, frequent coal bands Interbedded claystone, siltstone and very fine sandstone, with occasional pebbles and coaly streaks Interbedded bony coal and coaly claystone COAL, dull with bony streaks Claystone, with coal streaks and fragments Claystone, coal -y COAL, dull with 'cony streaks Shale, dark, coal. streaks Claystone Claystone, coal streaks Claystone, sil-tstone bands and very fine sa.-Astone bands Shale, dark, with coal streaks Interbedded claystone, siltstone and very fine sandstone Sandstone, soft Claystone, silty with few sandy streaks Sandstone, soft, occasional pebble bands Conglomerate, pebble with soft sandstone matrix Sandstone, soft to dense Sandstone, soft, with few pebbles and occasional claystone bands and coaly fragments Sandstone, soft Conglomerate, pebble and cobble, soft sandstone matrix Sandstone, dense with few pebbles and cobbles Conglomerate, pebble, in soft sandstone matrix Thickness Ft. in. Remarks'"' 0 10 9 9 o 6 9 2 10 Core broken, paeudo- coal bed. 44 3 Roof, "Pit" bed. 1 10 1 6 5 2 o 6 1 4 1 2 Floor, "Pit" bed6 1 7 0 7 17 6 0 9 36 o 3 0 16 7 49 6 3 1 Core loss 2 ft -3 in. 7 5 19 9 2 5 29 8 4 3 Bedding, where seen, nearly horizontal 6 9 _ 4 Depth 9 COAL From- 9 To - Ft. in. Ft. in. 383 7 399 0 399 0 412 4 412 4 432 22 432 22 435 4 Log,. hole 2 (Cont.) Material Claystone, silty bands, occaaiona:l Iron#t0no concretions and coaly streaks Sandstone, soft fine to medium Claystone to silty claystone, occasional ironstone concretions Claystone, carbonaceous, with coal fragments 435 4 435 9 COAL 435 9 435 102 Siltstone 435 102 436 0-3/4 Bone 436 437 0-3/4437 11 COAL 437 11 61 437 6? Bone 438 438 02 COAL o2 438 3 Bone 438 3 440 2 Bone with coal streaks 440 2 440 8 Bone 440 8 441 0 COAL 441 0 441 3 Bone 441 3 445 7 Claystone, coal streaks 445 7 461 3 Interbedded claystone, siltstone and very fine sandstone 461 3 461 9 Sandstone 461 9 461 11 Claystone 461 11 462 1 Sandstone, soft 462 1 462 11 Claystone 462 3.1 463 8 Claystone, coaly 463 8 477 0 Claystone, occasional sandy streaks 477 0 484 0 Sandstone, cross -bedded, fine to medium, few clay streaks 484 0 508 1 Claystone to silty claystone 508 1 509 10 Sandstone, soft 509 10 511 5 Claystone 511 5 511 8 Claystone, coaly 511 8 533 0 Claystone and fine sandstone, interbedded and cross -bedded 533 0 533 8 COAL, bony 533 8 543 0 Interbedded claystone and fine sandstone 543 0 545 3 Sandstone, claystone inclusions Thickness Ft. in. Remarks' 15 5 13 4 Core loss 2 ft. 0 in. 19 102 3 12 Roof of bed corres- ponding to log, hole 1, 296 ft. 9 in, to 302 ft. 6 in. 0 5 0 11 0 24 1 0-3/4 0 5 o 6 0 22 1 11 o 6 o 4 0 3 4 4 Floor 15 8 o 6 0 2 0 2 0 10 0 9 13 4 Bedding nearly flat. 7 0 24 1 1 9 1 7 0 3 21 4 o 8 9 4 2 3 Transition Log, hole 2 (Cont.) Depth From- To- Thickness Ft. in. Ft. in. Material Ft. in. Remarks 545 3 571 11 Sandstone 26 8 Bedding 15 degrees. Brackish water with evident gas pressure. 571 11 605 0 Conglomerate, pebble to cobble, soft sandstone matrix 33 1 Core loss 28 ft,8 in. 605 0 610 4 Sandstone, soft 5 4 Core loss 2 ft. 1 in. 610 4 648 4 Conglomerate, pebble to cobble, soft sandstone matrix 38 0 Core loss 30 ft.9 in. 648 4 652 10 Sandstone, dense, with calcite -filled fractures 4 6 Slickensides 652 10 666 3 Conglomerate, soft matrix 13 5 Core loss 12 ft.11 in. 666 3 675 0 Dense sandstone with coaly fragments 8 9 Core loss 7 ft. 1 in. 6?5 0 692 0 Conglomerate, soft matrix 17 0 Core loss 12 ft.9 in. 692 0 697 0 Claystone, silty 5 0 Core loss 0 ft.,7 in. Gas and water increas- ing down to this stratum. Static pres- sure up to 45 pounds. 697 0 726 3 Claystone, silty, with few bands of fine sandstone and occasional ironstone con- cretions and coaly streaks 29 3 726 3 728 2 Claystone, coaly 1 11 728 2 729 7 Claystone 1 5 729 7 730 11 Claystone, coaly 1 4 730 11 733 7 Interbedded claystone and fine sandstone 2• 8 733 7 735 7 Claystone, coal streaks 2 0 735 7 740 7 Claystone, sandy streaks and lenses 5 0 740 7 742 8 Sandstone, fine to medium, cross -bedded, with coaly streaks and occasional included pebbles 2 1 742 8 744 6 Claystone, coaly 1 10 744 6 753 3 Interbedded claystone and fine sandstone 8 9 753 3 805 11 Sandstone, fine to medium and dense to porous, with occasional claystone blebs, and pebble band at 794 ft. 52 8 Another gas channel apparent at 775 ft., not measurable.''- 805 11 832 9 Claystone, silty and sandy streaks 26 10 876 6 Depth 8 88o From- 895 To - Ft. in. Ft. in. 832 9 837 0 837 0 84o 9 840 9 843 3 843 3 847 10 847 10 848 3 848 3 85o 8 850 8 876 o 876 o 876 6 876 6 88o 8 88o 8 895 8 895 8 897 10 897 10 903 8 903 8 906 1 906 1 913 6 913 6 917 8 917 8 937 7 937 7 943 7 943 7 979 0 1 Log, hole 2 (Cont.) Material Sandstone, soft, with claystone and coaly streaks Claystone, sandy and coaly streaks Claystone, coaly, with many bright coal bands Sandstone, soft, with occasional claystone streaks Claystone Claystone, dark, with bright coal streaks Interbedded claystone and siltstone Sandstone, cross -bedded, with streaks of iron carbonate Claystone, dark, with occasional coal streaks Interbedded claystone and silty claystone Sandstone, fine, dense Interbedded claystone and siltstone Claystone, coaly Interbedded claystone, siltstone and :fine sandstone Claystone, coaly, with bright coal streaks Interbedded claystone and siltstone, with occasional ironstone concretions Claystone, coaly, with many bright coal bands and streaks Interbedded claystone, silt - stone and fine sandstone, with occasional ironstone concretions Thickne Ft. i ss 4 3 3 9 2 6 4 7 0 5 2 5 25 4 o 6 4 2 15 0 2 2 5 10 2 5 7 5 4 2 19 11 6 o 01 979 0 985 0 Sandstone 6 985 0 985 9 COAL, bony and bright 0 985 9 986 2 Claystone, coaly 0 986 2 987 2 COAL, bright 1 987 2 987 5 COAL, bony and bright 0 987 5 988 1 COAL 0 988 1 988 6 Claystone, coaly 0 5 Bedding of all above strata varies from 0 to 15 degrees 0 9 5 0 3 8 5 Depth From- To - Ft. in. Ft. in. 988 6 1013 8 1013 8 lo44 •6 1044 6 1072 0 1072 0 1097 1 1097 1 1105 10 1105 10 llo6 2 1106 2 1112 3 1112 3 1142 0 • Log, hole 2 (Cont.) Material Interbedded claystone and siltstone, with 3 ft. zone of ironstone concretions at 994 ft. Sandstone, fine to medium, occasional claystone streaks Sandstone with frequent conglomerate lenses of indeterminate thickness Interbedded claystone and silty claystone Claystone, dark, with frequent bright coal streaks and scattered sandstone concretions Claystone Interbedded claystone, siltstone and fine sandstone Sandstone, occasional claystone streaks Th Ft Log, hole 3 Location: 920 feet N, and 265 feet W. of SE. corner Sec R. 3 W.,�Seward Meridian, Houston, Alaska 5 Elevation: Collar of hole - 249 feet. T Material Ft Overburden, glacial sand, gravel and boulders Sandstone, dense, few included pebbles and cobbles Claystone Claystone, soft Shale, dark Claystone, coaly Claystone, coaly streaks Claystone, coaly Claystone, dark, silty, with occasional coaly streaks COAL, bony Interbedded claystone, silty claystone and siltstone .i hickness Depth ickness I, From- To - Ft. in. Ft. in. 0 0 43 6 43 6 48 6 48 6 50 5 50 5 51 11 51 11 53 2 53 2 53 5 53 5 53 7 53 7 55 0 55 0 58 7 58 7 6o 4 6o 4 87 6 T Material Ft Overburden, glacial sand, gravel and boulders Sandstone, dense, few included pebbles and cobbles Claystone Claystone, soft Shale, dark Claystone, coaly Claystone, coaly streaks Claystone, coaly Claystone, dark, silty, with occasional coaly streaks COAL, bony Interbedded claystone, silty claystone and siltstone .i hickness ickness in. Remarks`'` 25 2 30 10 27 6 Core mangled, no loss. 25 1 a 9 o 4 6 1 �9 9 . 18, T. 18 N., in. Remarks' 43 6 5 0 Core loss 3 ft. 4 in. 1 11 Core loss 9 in 1 6 Core loss 1 ft.' 2 in. 1 3 0 3 0 2 1 5 3 7 1 9 27 2
