Unnamed (west of lower Landmark Gap Lake) (ARDF #MH183) Fe

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

References

References Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
Reporters	W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date	7/18/2001