Pass Lake

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Mo; Zn
Ore minerals chalcopyrite; molybdenite; pyrite; pyrrhotite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale LH
Quadrangle map, 1:63,360-scale B-1
Latitude 61.3998
Longitude -153.2334
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at the toe of a glacier in small south tributary valley to the upper Chilligan River. It is at an elevation of about 4,800 feet, 0.4 mile southwest of peak 6017. The map site is in the SW/4 section 9, T 15 N, R22 W, of the Seward Meridian. It is locality 16 of MacKevett and Holloway (1977), locality 40 of Gamble and others (1989), and it is included under the name Pass Lake by Cobb and Reed (1981). It is approximately located, perhaps within one-half mile.

Geologic setting

Geologic description

This occurrence represents an approximately 5-square-mile area of local base metal geochemical anomalies (Resource Associates of Alaska, 1976). At the map site, Tertiary biotite granite float containing disseminated molybdenite assayed 960 ppm molybdenum. Tertiary granite throughout the area locally contains molybdenite, pyrite, and pyrrhotite, and, less commonly, chalcopyrite and sphalerite. At least some of the mineralization is probably in quartz veins.
Geologic map unit (-153.235615381585, 61.3991696672407)
Mineral deposit model Porphyry Cu-Mo (Cox and Singer, 1986, model 21a)
Mineral deposit model number 21a
Age of mineralization Tertiary. Sulfide mineralization is in Tertiary granitic rocks.
Alteration of deposit Quartz veining(?).

Production and reserves

Workings or exploration Reconnaissance surface observation and sampling has been completed in this area.
Indication of production None

Additional comments

This occurrence is within Lake Clark National Park.