Unnamed (south of King Salmon River)

Prospect, Probably inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; B; Hg
Ore minerals arsenopyrite; malachite
Gangue minerals limonite; quartz; scorodite

Geographic location

Quadrangle map, 1:250,000-scale TA
Quadrangle map, 1:63,360-scale B-6
Latitude 60.26
Longitude -158.09
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 2,700 feet on a ridgecrest in the headwaters of unnamed south tributaries to the upper King Salmon River. For this record, the map site is near the west end of the north boundary of section 23, T 2 N, R 51 W, of the Seward Meridian.

Geologic setting

Geologic description

Clark and others (1970 [OF 437]) report analytical data for several rock samples collected over about 6,000 feet of this ridgecrest. The samples contain weakly to strongly anomalous concentrations of Ag (to 3 ppm), Au (to 0.7 ppm), As, B, Cu, Mo, and Hg. These samples were collected in a large area of hornfels. Clark and others (1970 [OF 438]) generally describe hornfels with anomalous metal contents as strongly limonite stained and cut by numerous small quartz veins rarely exceeding 1/8 inch in width. Some of the quartz veins carry minor amounts of arsenopyrite, and arsenopyrite is also locally disseminated in hornfels. Some scorodite and malachite are also locally present.
Geologic map unit (-158.092244628904, 60.2592838905098)
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c?
Age of mineralization Late Cretaceous. Hornfels is developed in mid-Cretaceous clastic sedimentary rocks and is probably similar in age to hornfels at the Shotgun prospect (TA007). Intrusive rocks in the area of the Shotgun prospect are about 68 to 70 Ma in age.
Alteration of deposit Silicification and oxidation.

Production and reserves

Workings or exploration Reconnaissance surface observation and sampling has taken place on this prospect.
Indication of production None

References