Rua

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu; Zn
Ore minerals pyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale D-8
Latitude 60.8839
Longitude -146.6437
Nearby scientific data Find additional scientific data near this location
Location and accuracy
The map site of this prospect is at the position of the main tunnel, which is at the 500 foot elevation on the west side of Boulder Bay. The site is in the SE1/4 sec. 28, T. 11 S., R 8 W., of the Copper River Meridian. The location is accurate to within 500 ft. This prospect is shown as #6 in Cobb (1972: MF-392) and as C-88 in Jansons and others (1984).
Note: This site is different from the Rua Cove prospect on Knight Island in Prince William Sound.

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 pyrite and pyrrhotite in a shear zone in mafic volcanic rocks (Jansons and others, 1984).
This prospect was explored in the early 1900s by a 60-foot-long adit. Cobb (1979: OFR 79-973) reports some 'sacks of ore on beach.' One chip sample contained 900 ppm Cu and 0.19% Zn (Jansons and others, 1984).
Geologic map unit (-146.645711464259, 60.8833568214748)
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.

Production and reserves

Workings or exploration This prospect was explored in the early 1900s by a 60-foot-long adit. Cobb (1979: OFR 79-973) reports some 'sacks of ore on beach.' One chip sample contained 900 ppm Cu and 0.19% Zn (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.
This site is shown as a 'mine' on the map. Since there was no production from this deposit it is designated herein as a 'prospect'.

References

MRDS Number A010440

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