Bertha M.

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au
Ore minerals gold

Geographic location

Quadrangle map, 1:250,000-scale LC
Quadrangle map, 1:63,360-scale B-4
Latitude 60.28
Longitude -154.25
Nearby scientific data Find additional scientific data near this location
Location and accuracy Prospect located on the easternmost distributary of Kijik River, near where the river enters Lake Clark. Locality 22 of Nelson and others (1985) and locality 13 of MacKevett and Holloway (1977). Locality accurate within 1,600 m.

Geologic setting

Geologic description

Placer claims along Kijik River near Lake Clark. Rock units in the Kijik River drainage include: rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows (Nelson and others, 1983; unit Tv). And Unit TKi10, a granite porphyry with phenocrysts of quartz, plagioclase, and potassic feldspar up to 4 mm across in a groundmass of quartz, potassic feldspar, and plagioclase grains up to 1 mm across. Potassium-argon ages for unit Tv range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).
Geologic map unit (-154.252213133036, 60.2793346139225)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a)
Mineral deposit model number 39a
Age of mineralization Quaternary.
Alteration of deposit Not applicable

Production and reserves

Workings or exploration Unknown
Indication of production Undetermined
Reserve estimates No reserves
Production notes No production

Additional comments

Site is in Lake Clark National Park and Preserve.