Unnamed (south of East Fork Maclaren River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals azurite; malachite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-5
Latitude 63.2614
Longitude -146.4997
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is approximately located at an elevation of about 3,100 feet, one-half mile south of lowermost East Fork Maclaren River. The location is essentially on the boundary between the Mount Hayes B-5 and B-6 quadrangles. The location corresponds to locality 35 in table 2 of Nokleberg and others (1991). Nokleberg and others (1991), however, reported the latitude of the occurrence as 145o 29' 09, which would definitely place the occurrence on the B-5 quadrangle. The location is uncertain by a mile or so.

Geologic setting

Geologic description

The host rock of this occurrence is metabasalt of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991). The deposit consists of metabasalt cut by quartz veins containing azurite and malachite, secondary minerals after unknown primary copper minerals. Grab sample 79RM028C containing azurite and malachite assayed 1.5 percent copper (Nokleberg and others, 1991). Copper deposits of the Nikolai Greenstone typically contain small amounts of silver.
Geologic map unit (-146.501963826413, 63.2609700687933)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23).
Mineral deposit model number 23
Age of mineralization The deposit is probably Cretaceous or early Tertiary (see MH060 and MH100).

Production and reserves

Workings or exploration The occurrence is covered by active MAN Resources claims (W.T. Ellis, written communication, 2001).
Indication of production None