Hillside Occurrence, McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Location: The Hillside lead occurrence is on a south-facing slope at 1,800 feet (549 m) in elevation near the West Fork of Beaver Creek; it is about 2,500 feet (760 m) southwest of the Beaver prospect in Section 6, T. 24 S., R. 25 E., of the Kateel River Meridian. Location is known within about 250 feet (76 m).
Geology: At the Hillside occurrence, iron-rich gossan occurs in a 100 feet by 50 feet (30 m by 15 m) area that is hosted in solution breccias of the Beaver Creek Dolomite (Schmidt, 1997). Mineralization is believed to occur in roughly the same 'stratigraphic' horizon as the Beaver (MD048), Big Gate (MD050), and Bermuda (MD045) Mississippi Valley Type occurrences, which occur along the south limb of Beaver Creek Syncline. Host units are inferred to be Lower Paleozoic from fossils in dolomite (Blodgett, 1982). Grab samples from surface exploration contain from 0.22 to 2.40 percent lead and up to 2,200 ppm zinc in a 100 feet by 50 feet (30 m by 15 m) area (Schmidt, 1997).
Workings: The Hillside occurrence was discovered by WGM Inc. and Patino Ltd. during exploration for base metals in the 'Reef Ridge district' (Schmidt, 1997). Grab samples from surface exploration contain from 0.22 to 2.40 percent lead with up to 2,200 ppm zinc in a 100 feet by 50 feet (30 m by 15 m) area (Schmidt, 1997).
Age: Host units are inferred to be Lower Paleozoic from fossils in dolomite. (Blodgett, 1982); however, the age of the mineralization is unknown.
Commodities (Major) - Pb, Zn; (Minor) - Fe
Development Status: No
Deposit Model: Southeast Missouri Pb-Zn (Cox and Singer, 1986; model no. 32a) or Mississippi V
3 entries listed. 2 valid minerals.
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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. 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.