Unnamed Occurrence (ARDF - MM003; west-southwest of Chitsia Mountain), Kantishna Mining District, Denali Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MM003; west-southwest of Chitsia Mountain)	- not defined -
Kantishna Mining District	Mining District
Denali Borough	Borough
Alaska	State
USA	Country

The occurrence is in Denali National Park and Preserve.
Location: This occurrence is at an elevation of about 2300 feeton an unnamed ridge about 1.4 miles west-southwest of Chitsia Mountain. The location is accurate within 500 feet. It corresponds to number 33 of MacKevett and Holloway (1977), 74 of Bundtzen, Smith, and Tosdal (1976), 55 of Hawley and Associates (1978), and 83 of Bundtzen (1981), and is cited as an unnamed location by Cobb (1980 [OFR 80-363]).
Geology: The country rock at this occurrence is metarhyolite porphyry of the Totatlanika Formation, a volcanic-rich unit of Late Devonian and Mississippian age (Bundtzen, 1981). The deposit is a mineralized quartz vein 1 to 3 feet thick that strikes N 20-40 W, and is almost vertical. The vein is oxidized to a lead- and silver-bearing limonitic boxwork (gossan) that contains cerussite and, probably, small amounts of remnant galena and sphalerite. Selected samples of the vein assayed 3.10-10.5 percent lead, 1.17-2.73 ounces of silver per ton, 0.24 percent zinc, 0.02 ounce of gold per ton, and up to 72 ppm molybdenum, 24 ppm uranium, and 15 ppm thorium (Bundtzen, 1981, table 10, number 83). Although speculative, the trace element geochemistry of this vein is at least permissive of a syngenetic or diagenetic origin, related to Upper Devonian or Mississippian Totatlanika volcanism (Bundtzen, 1981). An Eocene age is also possible (see MM091).
Workings: There are no workings.
Age: Although speculative, the trace element geochemistry of this vein is at least permissive of a syngenetic or diagenetic origin, related to Upper Devonian or Mississippian Totatlanika volcanism (Bundtzen, 1981). An Eocene age is also possible (see MM091).
Alteration: Oxidation of iron and lead minerals.

Commodities (Major) - Pb; (Minor) - Ag, Au, Mo, Th, U, Zn
Development Status: No
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c).

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Link to USGS - Alaska:	MM003

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References