Unnamed (west of lower Landmark Gap Lake)

Occurrence, Active

Commodities and mineralogy

Main commodities Fe
Ore minerals pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-5
Latitude 63.1019
Longitude -146.108
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 3,500 feet; about one-half mile west of the south end of Landmark Gap Lake. It is at the northwest corner of section 18, T. 21 S., R. 9 E., Fairbanks Meridian. The location is accurate within about 800 feet.

Geologic setting

Geologic description

This prospect is hosted by an Upper Triassic mafic-ultramafic intrusive complex that is comagmatic with the basalt flows of the Nikolai Greenstone (Nokleberg and others, 1991; L. Hulbert, oral communication, 2001). Net-textured to massive pyrrhotite was found in a gabbro sill near the base of the Nikolai Greenstone at this site. There are virtually no base or precious metals associated with the sulfides (L.D. Hulbert, oral communication, 2001).
Geologic map unit (-146.110243984323, 63.1014725179824)
Mineral deposit model Ni-Cu-PGE in differentiated mafic-ultramafic sill.
Age of mineralization Late Triassic, the age of the host rock.

Production and reserves

Workings or exploration This occurrence is on active MAN Resources claims.
Indication of production None