Harrais

Prospect, Undetermined

Commodities and mineralogy

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale A-2
Latitude 61.0275
Longitude -141.625
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on Margaret Creek (which is not named on the McCarthy A-2 quadrangle). It is about 1,500 feet east-northeast of the cabins at Hubberts landing area and 3,500 feet northwest of the terminus of the Chitina Glacier. It is at an elevation of about 2,500 feet in the SE 1/4 of section 2, T. 10 S., R. 21 E. of the Copper River Meridian. This is locality 2 of MacKevett (1976). It was included in Cobb and MacKevett (1980) under the name 'Harrais'.

Geologic setting

Geologic description

Small, sporadically distributed pods and disseminations of chalcopyrite, galena, sphalerite, bornite, pyrite, native silver, limonite, malachite and azurite are localized along faults and in shear zones that cut Permian marble and calcareous schist (Seitz, 1963). The largest sulfide pod measured 10 inches long and 4 inches wide; a sample contained 4.78 percent copper, 6.53 percent lead, and 13.15 percent zinc (Seitz, 1963). The deposits were discovered in 1926 and explored through 1932. Six short adits, 3 to 30 feet long, were driven in outcrops along the west side of Margaret Creek. Some blasting and sampling were done in Dry Gulch about 1/4 mile west of Margaret Creek (Seitz, 1963). A log cabin, cache, and water reservoir and aqueduct were constructed near the prospect.
Geologic map unit (-141.626988360815, 61.0270816640154)
Mineral deposit model Pods and disseminations of base-metal sulfides
Age of mineralization The deposit is younger than the age of the host marble and schist and thus Permian or younger (MacKevett, 1978).
Alteration of deposit Oxidation; secondary limonite, azurite, and malachite are common.

Production and reserves

Workings or exploration The deposits were discovered in 1926 and explored through 1932. Six short adits, 3 to 30 feet long, were driven in outcrops along the west side of Margaret Creek. Some blasting and sampling were done in Dry Gulch about 1/4 mile west of Margaret Creek (Seitz, 1963). A log cabin, cache, and water reservoir and aqueduct were constructed near the prospect.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References