Geologic descriptionThis occurrence is a stratiform deposit in schistose metarhyolite porphyry in the Upper Devonian to Mississippian Totatlanika Formation (Bundtzen, 1981, p. 82). The outcrop of the deposit is about 300 feet long and about 10 feet wide; it strikes ENE and dips about 30 NW (Hawley and Associates, 1978; fig. 4.1-A(3)). The deposit consists of barite-rich layers 1 to 6 inches thick in silicified(?) schist containing pyrite, galena, and sphalerite. Selected barite-rich samples contain 36-52 percent barium. Pyrite is fairly abundant; galena and sphalerite less so. Some grab samples assayed up to 3.1 percent lead and 0.8 ounce of silver per ton, but most contained 1 percent or less each of lead and zinc (Buntzen, Smith, and Tosdal (1976); Hawley and Associates, 1978; Bundtzen, 1981). The deposit is probably volcanogenic in origin, and formed in Late Devonian or Mississippian time. |
Geologic map unit |
(-150.306930562623, 63.963810466265) |
Mineral deposit model |
Distal, barite-rich, kuroko massive sulfide deposit (Cox and Singer, 1986; model 28a). |
Mineral deposit model number |
28a |
Age of mineralization |
The deposit is probably Late Devonian or Mississippian, the depositional age of the Totatlanika metarhyolite hostrock (Bundtzen, 1981). |
Alteration of deposit |
Silicification of Totatlanika schistose metarhyolite. |