McNaughton and Turner

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals chalcopyrite; malachite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale D-8
Latitude 60.92
Longitude -146.64
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at the 500 foot elevation about 0.5 mile west of Turner Lake. It is in the E1/2 sec. 16, T. 11 S., R 8 W., of the Copper River Meridian. The location is accurate to within 2000 ft. This prospect is shown as #5 in Cobb (1972: MF-392) and as C-90 in Jansons and others (1984).

Geologic setting

Geologic description

The country rocks at this prospect are mafic volcanic rocks and sedimentary rocks of the Tertiary Orca Group (Nelson and others, 1985). The deposit consists of lenses of quartz, chalcopyrite, malachite, and sphalerite in a shear zone in graywacke near the contact of mafic volcanic rock (Cobb, 1979; OFR 79-973).
Geologic map unit (-146.642013977917, 60.9194590357134)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Probably Tertiary based on the age of the host rocks.
Alteration of deposit Local oxidation of sulfides.

Production and reserves

Workings or exploration One 70 foot tunnel reported by Cobb (1979: OFR 79-973) that could not be located in the early 1980s (Jansons and others, 1984).
Indication of production None

Additional comments

Nelson and others (1985) interpret the country rocks as accreted ocean crust. Crowe and others (1992; 1993) and Sainsbury (1993) discuss the genesis of the volcanogenic massive sulfide deposits in this area.
Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

References

MRDS Number 10307352

References

Sainsbury, C.L., 1993, Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska, A discussion: Economic Geology, v. 88, p. 1284-1285.
Reporters S.W. Nelson, Anchorage, AK
Last report date 6/10/2000