Chisna Consolidated (Buckeye Group)

Mine, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale D-7
Latitude 60.848
Longitude -146.529
Nearby scientific data Find additional scientific data near this location
Location and accuracy This mine is on the south shore of inner Landlocked Bay, just east of the mouth of China Creek. It is in the NE1/4 sec. 7, T. 12 S., R. 7 W., of the Copper River Meridian. The location of the site is accurate to within 1000 ft. This mine is shown as site C-69 in Jansons and others (1984) and as #16 in Cobb (1972: MF-392).

Geologic setting

Geologic description

The deposit is in mafic volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). It consists of thin films of chalcopyrite and pyrite along fractures within shear zones in the hanging wall of the Landlocked Bay fault (Mihelich and Wells, 1957).
Samples contained 0.64% Cu and trace amounts of Au and Ag (Mihelich and Wells, 1957). Chip samples collected by Jansons and others (1984) contained 0.2% to 0.38% Cu.
Geologic map unit (-146.530991210896, 60.8474506760099)
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 Two exploratory shafts sunk into shear zone. Samples contained 0.64% Cu and trace amounts of Au and Ag (Mihelich and Wells, 1957). Chip samples collected by Jansons and others (1984) contained 0.2% to 0.38% Cu.
Indication of production Yes; small
Reserve estimates Inferred reserves of 1,200 tons @ 0.26% Cu and 1,200 tons @ 0.3% Cu (Mihelich and Wells, 1957).
Production notes Some ore shipped (Mihelich and Wells, 1957).

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