Unnamed (headwaters of Slate Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Pb; Zn
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale D-4
Latitude 64.7717
Longitude -142.6468
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is a large mineralized quartz vein that was traced for several hundred feet along a small tributary near the head of Slate Creek. The coordinates are the map location of Foster (1970), in section 1, T. 2 S., R. 25 E., of the Fairbanks Meridian. The location is accurate within one-half mile. This unnamed occurrence is locality 171 on figure 2 in Foster (1970), but there is a misprint in the text that refers to figure 1. Locality 7 in the text of Cobb (1972 [MF-393]) refers to this unnamed occurrence, but the map location of Cobb (1972 [MF-393]) is incorrect due to the misprint in Foster (1970). This unnamed occurrence is locality 57 of Eberlein and others (1977).

Geologic setting

Geologic description

This occurrence is a large mineralized quartz vein in granitic rocks, mostly granodiorite, that can be traced for several hundred feet along a small tributary near the head of Slate Creek (Foster, 1970). The vein is 2 to 5 feet wide, and contains as much as 80 ppb gold, 0.7 ppm silver, and greater than 10,000 ppm arsenic. A felsic dike that cuts granodiorite one-half mile to the east contains 1,000 ppm lead and 1,500 ppm zinc. Felsic dikes are abundant in the headwaters of Slate Creek and form orange-brown stained zones that can be recognized from a distance. The Ole Creek prospect (EA007) is 3 miles to the east. Biotite from a nearby granite on upper Granite Creek (see EA128) adjacent to a gold-bearing quartz-arsenopyrite vein gives a 40Ar/39Ar plateau age of 93.3 +/- 0.5 Ma (Newberry and others, 1996). The veins here are similar and occurrence is also probably Cretaceous or younger.
Geologic map unit (-142.649124460723, 64.7713616717172)
Mineral deposit model Possibly Comstock epithermal veins (Cox and Singer, 1986; model 25c?).
Mineral deposit model number 25c?
Age of mineralization Biotite from a nearby granite on upper Granite Creek (EA005) adjacent to a gold-bearing quartz-arsenopyrite vein gives a 40Ar/39Ar plateau age of 93.3 +/- 0.5 Ma (Newberry and others, 1996). The veins here are similar and occurrence is also probably Cretaceous or younger.

Production and reserves

Workings or exploration Samples were collected at this unnamed occurrence at the headwaters of Slate Creek by the U.S. Geological Survey in 1969 (Foster, 1970).
Indication of production None

References