Bermuda

Site Name

Primary: Bermuda

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Commodity

Primary: Zinc
Secondary: Lead

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Location

State: Alaska
District: McGrath

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

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Physiography

Not available

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Mineral Deposit Model

Model Name: Mississippi Valley, S.E. Missouri Pb-Zn

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Secondary dolomite.

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Rocks

Role: Host
Age Type: Host Rock
Age Young: Paleozoic

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Analytical Data

Not available

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Materials

Ore: Smithsonite
Gangue: Dolomite

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Comments

Comment (Exploration): Status = Inactive

Comment (Deposit): Other Comments = See also Beaver (MD048), Hillside (MD049) and Big Gate (MD050) Mississippi Valley Type occurrences in Medfra B-3 quadrangle. The Bermuda prospect is on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Comment (Reference): Primary Reference = Andrews and Rishel, 1982

Comment (Commodity): Gangue = secondary carbonates

Comment (Geology): Age = Host rock is inferred to be Paleozoic based on fossil collections (Dutro and Patton, 1982). The age of the mineralization is unknown.

Comment (Workings): Workings / Exploration = 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).

Comment (Geology): Geologic Description = 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).

Comment (Deposit): Model Name = Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi Valley Type

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References

Reference (Deposit): Dutro, T.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.

Reference (Deposit): Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.

Reference (Deposit): 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.

Reference (Deposit): Andrews, Tom, and Rishel, John, 1982, Annual Report for 198, Reef Ridge I-to-XIII Project Areas, Kuskokwim Block, Alaska: Anchorage, Alaska, WGM Inc., Project Report 4, 45 pages, two sheets at 1:63,360 and 1:20,000 scales. (Report held by Doyon, Limited, Fairbanks, Alaska.)

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