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Home My WebLink AboutGMC Data Report No. 295 Geochemical assay data from U. S. Bureau of Mines hard-rock mineral cores (holes DMl, DM2, and DM3) of the Dust Mountain chromite prospect, northern Chugach Mountains of the Tonsina region west of the Copper River. , . ',~. ··,:,~,.ò,';('\~~'~,"<~ "., ',' , '~'*\'.~""f!.', " do, .~ ~.)~~. 1p' .~J~ \ .,.. ..... . ~^ . .~ 'Þ ......¡¡I"'.Þ '., . ..~ .,1IIjI , \ ; Received 28 November 2000. Alaska Geologic Materials Center Data Report No. 295 Total of 7 pages in report. a ~ 0 t1 P' ....... P' ?;j CD '"d 0 ::¡ N 1..0 VI US BUREAU OF MINES - DUST MT. CORE SAMPLES Hole No Recovery % Sample # From To Interval Thickness (ft) Au Wt (gm) Au Pt Pd Ag Cu DM1 96 459051 0 5 5 5 32.28 4 17 7 <0.5 15 DM1 92 459052 5 10 5 5 31.28 <1 18 13 <0.5 9 DM1 94 459053 10 15 5 5 30.95 1 16 18 <0.5 10 DM1 96 459054 15 20 5 5 31.74 1 22 15' <0.5 8 DM1 90 459055 20 25 5 5 32.22 <1 27 13 <0.5 7 DM1 46 459056 25 30 5 5 3028 <1 21 12 <0.5 13 DM1 51 459057 30 36.5 6.5 6.5 30.53 1 29 25 <0.5 19 DM1 83 459058 36.5 40.5 4 4 30.15 <1 <5 <1 <0.5 7 DM1 84 459059 40.5 45.5 5 5 31.8 <1 <5 <1 <0.5 11 DM1 102 459060 45.5 50 4.5 4.5 30.95 <1 <5 4 <0.5 9 DM1 88 459061 50 55 5 5 30.69 <1 24 20 <0.5 20 DM1 100 459062 55 57 2 2 30.19 <1 <5 2 <0.5 7 DM2 100 459063 0 0.75 0.75 0.75 7.50s 2 155 98 <0.5 8 DM2 90 459064 0.75 6.5 5.75 5.75 7.505 <1 540 328 1 13 DM2 67 459065 6.5 8.9 2A 2A 7.50s <1 171 110 <0.5 7 DM3 100 459066 0 0.65 0.65 0.65 7.505 <1 255 125 <0.5 13 DM3 67 459067 1 6.6 5.6 5.15 7.50s <1 456 282 0.7 10 DM3 56 459068 6.6 10.2 3.6 3.6 3126 <1 38 30 <0.5 3 DM3 78 459069 10A 13.8 3A 2.5 30.87 <1 36 25 <0.5 5 Blank Blank 459070 Blank Blank Blank Blank 30.16 1 <5 <1 0.6 <1 ~ P' (JQ (!) 0 ~ --...J Appendix2.xls Page 1 0 ~ 0 t:j P' ....... P' ~ CD '"d 0 >; ....... N 1..0 VI Hole No Recovery % Sample # From To Pb Zn Mo Ni Co Cd Bi As Sb Fe Tot DM1 96 459051 0 5 13 47 3 1440 110 <1.0 <5 <5 <5 7.63 DM1 92 459052 5 10 8 56 5 1515 117 <1.0 <5 <5 <5 7.93 DM1 94 459053 10 15 7 63 3 1547 124 <1.0 <5 <5 <5 8.31 DM1 96 459054 15 20 7 46 5 1445 110 <1.0 <5 <5 <5 7A7 DM1 90 459055 20 25 3 45 1 1575 110 <1.0 <5 <5 <5 7.05 DM1 46 459056 25 30 7 36 4 1447 104 <1.0 <5 <5 <5 6A2 DM1 51 459057 30 36.5 7 32 3 1141 86 <1.0 <5 <5 <5 5A1 DM1 83 459058 36.5 40.5 <2 48 4 1712 103 <1.0 <5 <5 <5 6.36 DM1 84 459059 40.5 45.5 6 66 4 1719 111 <1.0 <5 <5 13 7.08 DM1 102 459060 45.5 50 5, 32 3 1608 93 <1.0 <5 <5 9 5.75 DM1 88 459061 50 55 8 39 3 1493 105 <1.0 <5 <5 <5 6A DM1 100 459062 55 57 7 41 2 1614 105 <1.0 <5 <5 <5 6.18 DM2 100 459063 0 0.75 <2 208 7 1034 135 <1.0 <5 <5 74 >10.00 DM2 90 459064 0.75 6.5 <2 491 -7 1003 212 <1.0 <5 <5 229 >10.00 DM2 67 459065 6.5 8.9 <2 239 6 652 120 <1.0 <5 <5 98 >10.00 DM3 100 459066 0 0.65 <2 203 8 806 117 <1.0 <5 <5 56 >10.00 DM3 67 459067 1 6.6 <2 407 6 981 188 1.1 <5 <5 144 >10.00 DM3 56 459068 6.6 10.2 9 43 4 298 42 <1.0 <5 <5 <5 4.13 OM3 78 459069 10A 13.8 6 65 4 1014 115 <1.0 <5 <5 <5 8A9 Blank Blank 459070 Blank Blank 16 8 4 7 2 <1.0 <5 <5 <5 0.26 I-tj P' (JQ CD tv 0 ~ -...) Appendix2.xls Page 2 0 ~ 0 t1 P' ....... P' ~ CD '"d 0 ::4- tv 1..0 VI Hole No Recovery % Sample # From To Mn Te Ba Cr V Sn W La AI DM1 96 459051 0 5 1059 <25 7 1778 11 <20 <20 <5 0.17 DM1 92 459052 5 10 1105 <25 <5 2507 20 <20 <20 <5 0.26 DM1 94 459053 10 15 1127 <25 <5 4281 31 <20 <20 <5 0.29 DM1 96 459054 15 . 20 1056 <25 <5 1763 16 <20 <20 <5 0.17 DM1 90 459055 20 25 1002 <25 <5 1582 11 <20 <20 <5 0.12 DM1 46 459056 25 30 908 <25 <5 1565 10 <20 <20 <5 0.14 DM1 51 459057 30 36.5 901 <25 <5 1887 43 <20 <20 8 0.37 DM1 83 459058 36.5 40.5 897 <25 <5 4371 - 19 <20 <20 <5 0.26 DM1 84 459059 40.5 45.5 968 <25 <5 8871 35 <20 <20 <5 0.52 DM1 102 459060 45.5 50 847 <25 <5 2127 8 <20 <20 <5 0.12 DM1 88 459061 50 55 932 <25 11 1426 11 <20 <20 5 0.29 DM1 100 459062 55 57 889 <25 9 1747 11 <20 <20 <5 027 DM2 100 459063 0 0.75 1184 <25 <5 >20000 417 <20 <20 6 3.22 DM2 90 459064 0.75 6.5 1501 <25 <5 >20000 988 <20 <20 6' 7A9 DM2 67 459065 6.5 8.9 1182 <25 12 >20000 565 <20 <20 9 4.19 DM3 100 459066 0 0.65 1129 <25 <5 >20000 463 <20 <20 8 3A8 DM3 67 459067 1 6.6 1344 <25 <5 >20000 857 <20 <20 7 6.13 DM3 56 459068 6.6 10.2 770 <25 <5 5321 196 <20 <20 11 1.43 DM3 78 459069 10A 13.8 1166 <25 <5 3532 82 <20 <20 <5 0.57 Blank Blank 459070 Blank Blank 71 <25 249 173 7 <20 <20 14 0.67 ~ P' (JQ CD W 0 ~ --...J Appendix2.xls Page 3 a ~ 0 t1 P' ....... P' ?;j CD '"d 0 ::¡ N 1..0 VI Hole No Recovery % Sample # From To Mg Ca Na K Sr y Ga li Nb- DM1 96 459051 0 5 >10.00 0.45 0.02 0.02 <1 <5 <10 2 <5 DM1 92 459052 5 10 >10.00 0.64 0.02 <0.01 <1 <5 <10 <2 <5 DM1 94 459053 10 15 >10.00 0.77 0.02 <0.01 <1 <5 <10 2 <5 DM1 96 459054 15 20 >10.00 0.8 0.02 <0.01 <1 <5 <10 2 <5 DM1 90 459055 20 25 >10.00 0.33 0.02 <0.01 <1 <5 <10 2 <5 DM1 46 459056 25' 30 >10.00 0.38 0.02 <0.01 <1 <5 <10 2 <5 DM1 51 459057 30 36.5 >10.00 3.95 0.05 <0.01 6 <5 <10 3 <5 DM1 83 459058 36.5 40.5 >10.00 0.23 0.02 <0.01 <1 <5 <10 2 <5 DM1 84 459059 40.5 45.S >10.00 0.23 0.02 <0.01 <1 <5 <10 <2 <5 DM1 102 459060 45.5 50 >10.00 0.5 0.02 <0.01 <1 <5 <10 <2 <5 DM1 88 459061 50 55 >10.00 0.86 0.02 <0.01 6 <5 <10 <2 <5 DM1 100 459062 55 57 >10.00 0.41 0.02 <0.01 8 <5 <10 <2 <5 DM2 100 459063 0 0.75 >10.00 3.69 0:03 <0.01 5 <5 44 <2 14 DM2 90 459064 0.75 6.5 >10.00 0.29 0.02 <0.01 4 <5 140 2 33 DM2 67 459065 6.5 8.9 >10.00 7 0.04 <0.01 15 <5 63 <2 19 DM3 100 459066 0 0.65 >10.00 6.22 0.04 <0.01 5 <5 35 2 19 DM3 67 459067 1 6.6 >10.00 0.88 0.02 <0.01 <1 <5 92 <2 33 DM3 56 459068 6.6 10.2 >10.00 >10.00 0.07 <0.01 5 <5 <10 3 14 DM3 78 459069 10.4 13.8 >10.00 2.35 0.02 <0.01 <1 <5 <10 <2 <5 Blank Blank 459070 Blank Blank 0.87 >10.00 0.04 0.23 346 <5 <10 2 <5 ~ P' (JQ CD ~ 0 ~ --...J Appendix2.xls Page 4 CJ ~ 0 t1 P' .-t- P' ~ CD '"d 0 ::¡ tv 1..0 VI Hole No Recovery % Sample # From To Sc Ta Ti Zr Be U P S Bi DM1 96 459051 0 5 <5 <5 <0.01 <5 <1.0 <20 65 0.012 0.8 DM1 92 459052 5 10 <5 <5 <0.01 <5 <1.0 <20 57 0.015 <0.2 DM1 94 459053 10 15 5 14 <0.01. <5 <1.0 24 53 0.015 <0.2 DM1 96 459054 15 20 5 7 <0.01 <5 <1.0 <20 62 0.016 <0.2 DM1 90 459055 20 25 <5 <5 <0.01 <5 <1.0 21 44 0.011 <0.2 DM1 46 459056 25 30 <5 <5 <0.01 <5 <1.0 <20 43 0.01 <0.2 DM1 51 459057 30 36.5 16 <5 0.02 <5 <1.0 <20 49 0.024 <0.2 DM1 83 459058 36.5 40.5 <5 7 <0.01 <5 <1.0 43 47 0.013 <0.2 DM1 84 459059 40.5 45.5 <5 9 0.01 <5 <1.0 37 35 0.015 <0.2 DM1 102 459060 45.5 50 <5 <5 <0.01 <5 <1.0 <20 38 0.016 <0.2 DM1 88 459061 50 55 6 <5 <0.01 <5 <1.0 <20 29 0.021 <0.2 DM1 100 459062 55 57 <5 <5 <0.01 <5 <1.0 <20 50 0.022 <0.2 DM2 100 459063 0 0.75 18 23 0.07 <5 <1.0 <20 54 0.02 <0.2 DM2 90 459064 0.75 6.5 8 61 0.16 <5 <1.0 171 26 0.007 <0.2 DM2 67 459065 6.5 8.9 29 29 0.11 <5 <1.0 35 <10 0.033 <0.2 DM3 100 459066 0 0.65 27 26 0.08 <5 <1.0 <20 34 0.034 <0.2 DM3 67 459067 1 6.6 9 49 0.13 <5 <1.0 120 58 0.01 <0.2 DM3 56 459068 6.6 10.2 48 <5 0.05 <5 <1.0 <20 25 0.047 <0.2 DM3 78 459069 10A 13.8 11 8 ·0.02 <5 <1.0 <20 47 0.018 <0.2 Blank Blank 459070 Blank Blank <5 <5 0.02 <5 <1.0 <20 65 0.116 <0.2 ~ P' (JQ (!) VI o ~ --...J Appendix2.xls Page 5 a ~ 0 t1 P' ....... P' ïO CD '"d 0 ::4- N 1..0 VI Hole No Recovery % Sample # From DM1 96 459051 0 DM1 92 459052 5 DM1 94 459053 10 DM1 96 459054 15 DM1 90 459055 20 DM1 46 459056 25 DM1 51 459057 30 DM1 83 459058 36.5 DM1 84 459059 40.5 DM1 102 459060 45.5 DM1 88 459061 50 DM1 100 459062 55 DM2 100 459063 0 DM2 90 459064 0.75 DM2 67 459065 6.5 DM3 100 459066 0 DM3 67 459067 1 DM3 56 459068 6.6 DM3 78 459069 10A Blank Blank 459070 Blank ~ P' (JQ (!) 0'\ 0 ~ --...J To Description 5 Mostly serpentinized dunite with light green 1-2 mm veinlets of brucite(?) coating fractures. 10 -50% serpentinized dunite and -50% clinopyroxenite. Brucite along fractures and trace of chromite. 15 As above, but with -2% chromite disseminated in the clinopyroxenite. 20 Mostly serpentinized dunite with brucite along fractures and a couple of small 1-2 cm clinopyroxenite layers. 25 Serpentinized dunite with brucite along fractures. 30 Serpentinite dunite {as above)-poor recovery-rubbly. 36.5 Rubbly serpentinized dunite and clinopyroxenite (-50/50) with disseminated chromite in the clinopyroxenite. 40.5 Rubbly serpentinized dunite with brucite along fractures. 45.5 Serpentinized dunite and clinopyroxenite with brucite along fractures and 2-3% disseminated chromite. 50 SerpenÙnized dunite with brucite along fractures and a trace of chromite. 55 Serpentinized dunite with brucite along fractures (parts rubbly) with a trace of chromite. 57 As above, -50% rubbly at the end of the hole. 0.75 Clinopyroxenite with massive and disseminated ehromite. 6.5 Massive chromite with clinopyroxenite matñx. 8.9 Clinopyroxenite with banded and disseminated ehromite. 0.65 Clinopyroxenite with -5% disseminated ehromite, O. r massive chromite at the top of the hole. 6.6 -80% massive chromite with -2-5 em clinopyroxenite layers containing disseminated chromite. 10.2 Clinopyroxenite with -20% disseminated and blebby (massive) chromite. 13.8 Serpentinized dunite and clinopyroxenite with disseminated chromite. Blank Sample blank- T olovana limestone. Appendix2.xls Page 6 o ~ o t1 P' ....... P' ~ CD '"d o ::4- N 1..0 VI Hole No DM1 DM1 DM1 DM1 DM1 DM1 DM1 DM1 DM1 DM1 DM1 DM1 DM2 DM2 DM2 DM3 DM3 DM3 DM3 Blank I¡j P' {JQ CD --...J o ~ --...J Recovery % 96 92 94 96 90 46 51 83 84 102 88 100 100 90 67 100 67 56 78 Blank Sample # 459051 459052 459053 459054 459055 459056 459057 459058 459059 459060 459061 459062 459063 459064 459065 459066 459067 459068 459069 459070 From o 5 10 15 20 25 30 36.5 40.5 45.5 50 55 o 0.75 6.5 o 1 6.6 10.4 Blank To Comments 5 10 15 20 25 30 36.5 40.5 45.5 50 55 57 0.75 6.5 8.9 0.65 6.6 Intervals 0.65'-1.0' and 1.9'-2.35' were not included due to previous sampling. 10.2 13.8 Intervals 10.2'-10.4', 12.4'-12.9', and 13.1'-13.5' were not included due to previous sampling. Blank The quality of this blank has never been tested, but unlikely to contain Pt, Pd, Cr. Appendix2.xls Page 7