Ibach; The Sure Thing 1906 Prospect, Copper River Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Ibach; The Sure Thing 1906 Prospect	Prospect
Copper River Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Ibeck Creek is (mis)named for Joe (?) Ibach, an early prospector in the area. Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.
Location: This prospect is at an elevation of about 2100 feet on the east wall of Ibeck Creek approximately 2.5 miles north of the toe of Scott Glacier. It is in the N1/2 sec. 15, T. 14 S., R. 1 W., of the Copper River Meridian. Location accurate to within 1000 ft. Location corresponds to site C-17 in Jansons and others (1984).
Geology: This prospect is hosted in a unit of the Tertiary Orca Group consisting mostly of tabular or lenticular bodies of mafic volcanic rocks, including pillowed or massive flows, breccia and dikes (Nelson and others, 1985). Grant and Higgins (1910) reported a vein 12-20 feet wide and two miles long in the area. Jansons and others (1984) reported a 14-foot-wide shear zone in volcanic rock containing small lenses of pyrite, pyrrhotite, chalcopyrite, and sphalerite. U.S. Bureau of Mines sampling and analysis (Jansons and others, 1984) in the area yielded the following results from five chip samples: 4 ppm to 3.4% Cu, 40 ppm to 1.95% Zn, 10 ppm to 0.26% Pb, and 3.6 to 11 ppm Ag. Four grab samples contained 0.52 to 5.5% Cu, 215 ppm to 2.4% Zn, 30 ppm to 0.28% Pb, and 0.4 ppm to 14 ppm Ag.
Workings: Workings consist of an 80-foot-long adit. U.S. Bureau of Mines sampling and analysis (Jansons and others, 1984) in the area yielded the following results from five chip samples: 4 ppm to 3.4% Cu, 40 ppm to 1.95% Zn, 10 ppm to 0.26% Pb, and 3.6 to 11 ppm Ag. Four grab samples contained 0.52 to 5.5% Cu, 215 ppm to 2.4% Zn, 30 ppm to 0.28% Pb, and 0.4 ppm to 14 ppm Ag.
Age: Probably Tertiary based on the age of the host rocks.
Alteration: Surface oxidation.
Reserves: Inferred reserves are estimated at 3,800 tons @ 2.8% Cu, 2.2% Zn, and 10 ppm Ag (Garret, 1971).

Commodities (Major) - Ag, Cu, Pb, Zn
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

Other Databases

Link to USGS - Alaska:	CV053

Other Regions, Features and Areas containing this locality

References