Unnamed (head of Hartman River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Zn
Ore minerals arsenopyrite; chalcopyrite; pyrite; pyrrhotite; sphalerite
Gangue minerals quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale C-2
Latitude 61.5914
Longitude -153.5703
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in the peaks at the head of the southeast headwaters of the Hartman River. It is at an elevation of about 5,100 feet and 1.2 miles northwest of peak 5875. The map site is in the NE1/4 section 2, T 17 N, R 24 W, of the Seward Meridian. This is locality 6 of Cobb (1972 [MF 412]; 1976 [OF 76-485]). The location is probably accurate to within a quarter of a mile.

Geologic setting

Geologic description

Reed and Elliott (1970) reported finding mineralized float boulders at this locality. The boulders include argillite cut by 6-inch-wide quartz veins containing arsenopyrite, pyrite, tourmaline, and chalcopyrite, as well as quartz porphyry cut by thin veinlets containing pyrite and sphalerite. Cobb and Reed (1981) reported that upper Mesozoic graywacke, shale, and argillite are cut by mineralized shear zones and faults that contain disseminated sulfides, narrow veins of massive sulfide minerals, and quartz veins with minor amounts of sulfide minerals. In addition to copper and zinc anomalies, samples contain as much as 70 ppm silver and 0.9 ppm gold. This mineralized area is about one mile from a small Tertiary granitic stock.
Geologic map unit (-153.572546677939, 61.5907569769993)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986, model 22c)
Mineral deposit model number 22c
Age of mineralization Tertiary? Mineralization crosscuts Upper Mesozoic sedimentary rocks. Polymetallic mineralization in this region is commonly associated with Tertiary granitic rocks.
Alteration of deposit Quartz and tourmaline veining.

Production and reserves

Workings or exploration Reconnaissance sampling has been completed in this area (Reed and Elliott, 1970).
Indication of production None

References