Unnamed Occurrence (ARDF - LH015; head of Hartman River), McGrath Mining District, Bethel Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - LH015; head of Hartman River)	- not defined -
McGrath Mining District	Mining District
Bethel Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is in the peaks between Sled Pass and the southeast headwaters of the Hartman River. It is at an elevation of about 5,900 feet, 1.3 miles east-southeast of peak 7435. The map site is in the SW1/4 section 14, T 18 N, R 24 W, of the Seward Meridian. This is locality 4 of Cobb (1972 [MF 412]; 1976 [OF 76-485]) and locality 18 of Gamble and others (1989). The location is probably accurate to within a quarter of a mile.
Geology: Reed and Elliott (1970) reported blocks of massive stibnite as much as a foot across in frost-heaved rubble near the top of the ridge and in talus. This float is within a few feet of its source, which is probably stibnite-bearing veins localized along faults or shears in Upper Mesozoic argillite and graywacke. In addition to high concentrations of antimony, samples contain as much as 500 ppm lead and 0.45 ppm gold. The mineralized area is near the contact with a Cretaceous or Tertiary granite pluton.
Workings: Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).
Age: Tertiary? Mineralization crosscuts Upper Mesozoic sedimentary rocks. Polymetallic mineralization in this region is commonly associated with Tertiary granitic rocks.

Commodities (Major) - Au, Sb
Development Status: None
Deposit Model: Simple Sb deposits (Cox and Singer, 1986, model 27d)

Other Databases

Link to USGS - Alaska:	LH015

Other Regions, Features and Areas containing this locality

References