Big Gate

The Big Gate is a zinc mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Big Gate

Commodity

Primary: Zinc
Secondary: Lead

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

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

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Secondary dolomite.

Rocks

Role: Host
Age Type: Host Rock
Age Young: Silurian

Analytical Data

Not available

Materials

Not available

Comments

Comment (Workings): Workings / Exploration = The Big Gate gossan was discovered by WGM Inc. and Patino Ltd. during exploration for base metals in the late 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). Surface grab samples contained up to 0.1 percent lead and 2.0 percent zinc.

Comment (Geology): Geologic Description = The Big Gate iron-rich gossan occurs in the Beaver Dolomite of Andrews and Rishel (1982), the same unit hosting mineralization at the Hillside (MD0049), Beaver (MD048), and Bermuda (MD045) Mississippi Valley Type showings. The gossan occurs in an irregular zone with an approximate surface diameter of 200 feet (61 m). Host units are inferred to be Silurian from fossils (Dutro and Patton, 1982). The age of the mineralization is unknown. Grab samples contained up to 0.1 percent lead and 2.0 percent zinc (Andrews and Rishel, 1982).

Comment (Geology): Age = Host units are inferred to be Silurian from fossils (Dutro and Patton, 1982). The age of the mineralization is unknown.

Comment (Exploration): Status = Inactive

Comment (Deposit): Other Comments = See Hillside (MD049), Beaver (MD048), and Bermuda (MD045) Mississippi Valley Type occurrences. The Big Gate occurrence is on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Comment (Commodity): Gangue = Mineralized gossan

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

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

References

Reference (Deposit): Blodgett, R.B., 1982, Stratigraphy of Reef Ridge project area: WGM Inc., Anchorage, Alaska, Reef Ridge Project area, Block 10, Doyon region: 34 pages.

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): 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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