Scientific Investigations Report 2007-5039
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007-5039
Table 1. Permissive mineral deposit tracts within the Bay Resource Management Plan area.
[Deposit model: From Cox and Singer, 1986. Abbreviations: BC‑AK, British Columbia-Alaska. Au, gold; Ag, silver; An, anorthite; Cu, Copper; Hg, mercury; Mo, molybdenum; Pb, lead; PGE, Platinum-group elements; Pt, platinum; Zn, zinc. gpt, gram per metric ton; km2, square kilometer; ppb, parts per billion; %, percent; mt, metric ton; NA, not estimated]
| Tract identification No. | Area (km2) | Deposit type | Deposit model | Estimated number of median deposits at three probability levels | Mean number of undiscovered deposits | Median tonnage (mt) | Median grade | ||
|---|---|---|---|---|---|---|---|---|---|
| 90 | 50 | 10 | |||||||
| Deposit models for which quantitative estimates were made | |||||||||
| BCAK | 37,480 | Porphyry Cu, BC-AK type | 17.1 | 3 | 6 | 17 | 8.1 | 86 | 0.37% Cu, 0.0025% Mo |
| CUSK1 | 11,020 | Copper (Au) skarn | 18b | 1 | 2 | 10 | 4.1 | 0.56 | 1.7% Cu |
| CUSK2 | 1,950 | Copper (Au) skarn | 18b | No estimate made | NA | ||||
| EPIV | 43,470 | Epithermal vein, generic | 25d | 3 | 7 | 20 | 9.5 | 0.3 | 6 gpt Au, 38 gpt Ag |
| FESK1 | 11,020 | Iron Skarn | 18d | 1 | 2 | 10 | 4.1 | 7.2 | 50.0% Fe |
| FESK2 | 1,950 | Iron Skarn | 18d | No estimate made | NA | ||||
| HG | 47,570 | Mercury | 27a | 1 | 2 | 5 | 2.5 | 0.0095 | 0.35% Hg |
| IRG-SIL | 42,260 | Intrusion-Related Gold (shallow to intermediate level) | New | 0 | 1 | 5 | 1.9 | 15 | 1 gpt Au |
| PGEP | 11,770 | Placer PGE (Au) | 39b | 3 | 7 | 20 | 9.5 | 0.11 | 2,500 ppb Pt |
| PLACER1 | 55,350 | Placer Au | 39a | 1 | 2 | 7 | 3.1 | 1.1 | 0.2 gpt Au |
| PLACER2 | 15,260 | Placer Au | 39a | No estimate made | NA | ||||
| Deposit models for which no quantitative estimates were made | |||||||||
| BESSHI | 15,970 | Besshi massive sulfide | 24b | No estimate made | NA | ||||
| CYPRUS | 5,060 | Cyprus massive sulfide | 24a | No estimate made | NA | ||||
| HSAU | 43,470 | Hot spring gold | No estimate made | NA | |||||
| KUROKO1 | 6,650 | Kuroko massive sulfide | 28a | No estimate made | NA | ||||
| KUROKO2 | 10,290 | Kuroko massive sulfide | 28a | No estimate made | NA | ||||
| LOSAU | 6,600 | Low-sulfide Au-quartz veins | 36a | No estimate made | NA | ||||
| MVT | 1,720 | Mississippi Valley Type Pb-Zn and Kipshi Cu-Pb-Zn | 32a, 32b, 32c | No estimate made | NA | ||||
| SNG | 36,120 | Sn Greisen | 15c | No estimate made | NA | ||||
| ZNSK1 | 11,020 | Zinc (lead) skarn | 18c | No estimate made | NA | ||||
| ZNSK2 | 1,950 | Zinc (lead) skarn | 18c | No estimate made | NA | ||||
| ZUM1 | 6,600 | Alaskan (Zoned Ultra-mafic Complex) PGE | 9 | No estimate made | NA | ||||
| ZUM2 | 2,720 | Alaskan (Zoned Ultra-mafic Complex) PGE | 9 | No estimate made | NA | ||||
| ZUM3 | 900 | Alaskan (Zoned Ultra-mafic Complex) PGE | 9 | No estimate made | NA | ||||
U.S.
Department of the Interior | U.S. Geological
Survey
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