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Big Gate Occurrence, McGrath District, Yukon-Koyukuk Borough, Alaska, USA

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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.
Location: The Big Gate zinc occurrence is located at an elevation of approximately 1,700 feet (518 m), east of the North Fork of Soda Creek in Section 1, T. 24 S., R. 24 E., of the Kateel River Meridian. Location is known to within 250 feet (76 m).
Geology: 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).
Workings: 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.
Age: Host units are inferred to be Silurian from fossils (Dutro and Patton, 1982). The age of the mineralization is unknown.
Alteration: Secondary dolomite.
Reserves: None.

Commodities (Major) - Zn; (Minor) - Pb
Development Status: No
Deposit Model: Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi V

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Anderson, G.M., and Macqueen, R.W., 1988, Mississippi Valley Type lead-zinc deposits, in Roberts, R.G., and Sheahan, P.A., eds., Ore deposit models: Geoscience Canada Reprint Series 3, Ottawa, Canada, p. 79-90. Blodgett, R.B., 1982, Stratigraphy of Reef Ridge project area; WGM Inc., Anchorage, Alaska, Reef Ridge Project area, Block 10, Doyon region: WGM Inc., 34 pages. 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.

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