Mansfield (ARDF #JU217) Au, Cu, Pb, Zn

Mansfield

Prospect, Inactive

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Alternative names

Seattle

Commodities and mineralogy

Main commodities	Au; Cu; Pb; Zn
Ore minerals	chalcopyrite; galena; pyrrhotite; sphalerite
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	JU
Quadrangle map, 1:63,360-scale	B-3
Latitude	58.263
Longitude	-134.8565
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This prospect is at an elevation of about 500 feet, approximately 1.5 miles east-northeast of Funter, and 0.5 mile southeast of Bear Creek at the head of Funter Bay. It is near the northwest corner of section 6, T. 42 S., R. 65 E. of the Copper River Meridian. The location is accurate within 1/4 mile.

Geologic setting

Geologic description This prospect was discovered before 1908; it consists of several conformable quartz veins in schist. The veins are 3 feet to 6 feet thick, 100 feet apart, and strike northwest. They contain disseminated chalcopyrite, pyrrhotite, and minor galena and sphalerite (Wells and others, 1986). The prospect is developed by surface trenches, a tunnel, and a crosscut. (Cobb, 1978 [OFR 78-374]). No other information is available. The rocks in the general area are mainly Ordovician and Devonian to Triassic clastic units, mafic-intermediate volcanic rocks, and subordinate limestone. The bedded rocks are intruded and locally metamorphosed by Cretaceous granodiorite (Gehrels and Berg, 1994).
Geologic map unit	(-134.858293702052, 58.2626645022187)

Geologic description

This prospect was discovered before 1908; it consists of several conformable quartz veins in schist. The veins are 3 feet to 6 feet thick, 100 feet apart, and strike northwest. They contain disseminated chalcopyrite, pyrrhotite, and minor galena and sphalerite (Wells and others, 1986). The prospect is developed by surface trenches, a tunnel, and a crosscut. (Cobb, 1978 [OFR 78-374]). No other information is available.

The rocks in the general area are mainly Ordovician and Devonian to Triassic clastic units, mafic-intermediate volcanic rocks, and subordinate limestone. The bedded rocks are intruded and locally metamorphosed by Cretaceous granodiorite (Gehrels and Berg, 1994).

Geologic map unit

(-134.858293702052, 58.2626645022187)

Production and reserves

Workings or exploration	The prospect is developed by surface trenches, a 20-foot tunnel, and a crosscut.
Indication of production	None

References

MRDS Number	A012077
References Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Juneau quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-374, 155 p. Gehrels, G.E., and Berg, H.C., 1994, Geology of southeastern Alaska, in Plafker, George, and Berg, H. C., eds., The geology of Alaska: Geological Society of America, DNAG, The geology of North America, Vol. G-1, p. 451-467. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.
Reporters	J.C. Barnett and L.D. Miller (Juneau, Alaska )
Last report date	12/15/2001