Slate Creek (junction with Tozimoran Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au; Sn
Ore minerals cassiterite; gold

Geographic location

Quadrangle map, 1:250,000-scale TN
Quadrangle map, 1:63,360-scale B-6
Latitude 65.38255
Longitude -152.70887
Nearby scientific data Find additional scientific data near this location
Location and accuracy This placer occurrence is at the junction of Slate Creek and Tozimoran Creek. The site is in the northeast quarter of section 4, T. 6 N., R. 25 W., of the Fairbanks Meridian. The occurrence includes part of Tozimoran Creek just below the mouth of Slate Creek. The location is accurate within several hundred feet. The site corresponds to location 3 of Eberlein and others (1977).

Geologic setting

Geologic description

Bedrock in the Tozimoran Creek area consists of metamorphosed sedimentary and mafic igneous rocks (Chapman and others, 1963). The local bedrock is mainly quartz-mica schist. Coarsely crystalline to porphyritic Cretaceous granite, cut by smaller granitic dikes, crops out about 7 miles north and west of this site (Chapman and others, 1982). Placer deposits in the Moran Dome area are alluvial deposits formed by the modern streams. Older alluvial deposits are limited in extent and occur in several places along Tozimoran Creek above its confluence with Slate Creek. The average width of alluvium in the present valley bottom of Tozimoran Creek near the mouth of Slate Creek is 250 feet (Chapman and others, 1963).
In 1942, the U.S. Geological Survey examined the Moran Dome area for cassiterite-bearing placer deposits (Chapman and others, 1963). In 1952, areas of Tozimoran Creek were drilled and trenched under a Defense Minerals Exploration Administration contract. A shaft dug in 1942 near the mouth of Slate Creek reportedly reached bedrock at a depth of 25 feet. Material from the shaft yielded $1.65 in gold (gold at $35 per ounce) and 7 pounds of 'tinstone' (cassiterite and other minerals in pebbles and cobbles). Microscope examination of the tinstone showed cassiterite, associated with pale-brown tourmaline, in narrow veinlets in micaceous quartzite (Chapman and others, 1963).
Geologic map unit (-152.711404471462, 65.3820190723744)
Mineral deposit model Placer Au(-Sn) (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Quaternary.

Production and reserves

Workings or exploration In 1942, the U.S. Geological Survey examined the Moran Dome area for cassiterite-bearing placer deposits (Chapman and others, 1963). In 1952, areas of Tozimoran Creek were drilled and trenched under a Defense Minerals Exploration Administration contract. A shaft dug in 1942 near the mouth of Slate Creek reportedly reached bedrock at a depth of 25 feet. Material from the shaft yielded $1.65 in gold (gold at $35 per ounce) and 7 pounds of 'tinstone' (cassiterite and other minerals in pebbles and cobbles). Microscope examination of the tinstone showed cassiterite, associated with pale-brown tourmaline, in narrow veinlets in micaceous quartzite (Chapman and others, 1963).
Indication of production None

References