Bermuda Prospect, McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Location: The Bermuda prospect is located on a southwest spur at 2,000 feet (610 m) in elevation near the head of Beaver Creek, in the extreme southwest corner of Section 28, T. 23 S., R. 25 E., of the Kateel River Meridian. Location is known to within 100 feet (30 m).
Geology: At the Bermuda prospect, iron-rich smithsonite gossan is hosted in recrystallized dolomite, which is considered to be the same northeast striking, mineralized dolomite layer as at the Big Gate (MD050) and Beaver (MD048) zinc occurrences. Host unit is probably equivalent to the Paradise Fork Formation of Dutro and Patton (1982); unit OSbd of Andrews and Rishel (1982). Host rock is inferred to be mid-Paleozoic based on fossil collections (Dutro and Patton, 1982). The age of mineralization is unknown. Composite grab samples in main spur area contained an average of 0.67 percent zinc and 0.035 percent lead. Further to the northeast, float found in stream cut along strike contained 17.00 percent zinc and 0.23 percent lead (Andrews and Rishel, 1982).
Workings: The Bermuda prospect was found by WGM Inc. and Patino Ltd. in the late 1970s during exploration for base metals on lands selected by Doyon Ltd (Andrews and Rishel, 1982) Composite grab samples in main spur area contained an average of 0.67 percent zinc and 0.035 percent lead. Further to the northeast, float found in stream cut along strike contained 17.00 percent zinc and 0.23 percent lead (Andrews and Rishel, 1982).
Age: Host rock is inferred to be Paleozoic based on fossil collections (Dutro and Patton, 1982). The age of the mineralization is unknown.
Alteration: Secondary dolomite.
Commodities (Major) - Zn; (Minor) - Pb
Development Status: No
Deposit Model: Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi V
2 entries listed. 2 valid minerals.
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Andrews, Tom, and Rishel, John, 1982, Annual Report for 1981, Reef Ridge I-to-XIII Project Areas, Kuskokwim Block, Alaska: Anchorage, Alaska, WGM Inc., Project Report 4, 45 p., 2 sheets, scales 1:63,360 and 1:20,000. (Report held by Doyon, Limited, Fairbanks, Alaska.) Dutro, J.T. Jr., and Patton,W.W. Jr., 1982, New Paleozoic formations in the northern Kuskokwim Mountains, west-central Alaska: U.S. Geological Survey Bulletin 1529-H, p. H13-H22. Patton, W.W. Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811, one sheet at 1:250,000 scale. Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.