Harrais Prospect, Nizina Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Harrais Prospect	Prospect
Nizina Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

The locality is in the Wrangell-Saint Elias National Park and Preserve.
Location: 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'.
Geology: 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.
Workings: 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.
Age: The deposit is younger than the age of the host marble and schist and thus Permian or younger (MacKevett, 1978).
Alteration: Oxidation; secondary limonite, azurite, and malachite are common.

Commodities (Major) - Ag,Cu, Pb, Zn
Development Status: None
Deposit Model: Pods and disseminations of base-metal sulfides

Other Databases

Link to USGS - Alaska:	MC213

Other Regions, Features and Areas containing this locality

References