Cache Creek - South Occurrence, McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Location: The Cache Creek South occurrence is located at approximately 2,400 feet (732 m) in elevation at the head of Cache Creek, a tributary to the South Fork of White Mountain Creek in Section 30, T. 22 S., R. 25 E., of the Kateel River Meridian. Location is known to within 100 feet (30 m).
Geology: Intense zinc-bearing solution breccia zone hosted in Paradise Fork Formation of Dutro and Patton (1982), which is also unit 'Sic' of Andrews and Rishel (1982). The zone appears to be about 10 feet (3 m) thick, and can be traced for about 200 feet (61 m) along a strike direction of N 55 E. Mineralization difficult to recognize due to the elusive color (pale tan) of sphalerite. Host rock is inferred to be Silurian based on age of the 'Sic' unit (Patton and others 1980; Blodgett, 1982). Four surface grab samples ranged from 0.64 percent to 6.40 percent zinc and averaged 2.20 percent zinc, with no appreciable lead (Andrews and Rishel, 1982).
Workings: The Cache-Creek-South was discovered in the late 1970s during regional exploration conducted by WGM Inc. on lands selected by Doyon Ltd. Four surface grab samples contained 0.64 percent to 6.40 percent zinc and averaged 2.20 percent zinc, with no appreciable lead (Andrews and Rishel, 1982).
Age: The host rock is probably Silurian based on age of 'Sic' unit (Blodgett, 1982). The age of the mineralization is unknown.
Alteration: Recrystallized dolomite.
Reserves: None.
Commodities (Major) - Zn
Development Status: No
Deposit Model: Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi V
Mineral List
2 entries listed. 2 valid minerals.
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References
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.) 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. 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.
