Prospect, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold; jarosite; limonite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale B-6
Latitude 59.4188
Longitude -155.2201
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Aukney prospect is near lake level on the south shore of Lake Iliamna north of Big Mountain, about 1.7 miles west-southwest of Eagle Bluff. For this record, it is on the shoreline of the lake, in the NW1/4 sec. 8, T. 9 S., R. 35 W., Seward Meridian. The accuracy is uncertain; the prospect could be about a mile farther west-southwest, in the Iliamna B-7 quadrangle (see Geologic description).

Geologic setting

Geologic description

Rocks tentatively mapped as Jurassic Talkeetna Formation strike east-northeast and are exposed in outcrops along Lake Iliamna north of Big Mountain, a volcanic massif of Tertiary age (Reed and Detterman, 1980). Rocks exposed along the shoreline to the west-southwest are undivided Tertiary volcanic rocks.
Martin and Katz (1910, p. 198) described the rocks at the Aukney prospect as tuffaceous and cherty beds containing finely disseminated pyrite. The beds strike northeast and dip 75SE to vertical. If these rocks are the Talkeetna Formation as mapped by Detterman and Reed (1980), this record's location of the site is probably accurate. If the strata are Tertiary, however, the claim could be about a mile to the west-southwest.
The deposit was prospected by blasting the shoreline cliffs (Martin and Katz, 1910, 1912). The cliffs are stained yellow, probably by jarosite, a common component of limonite formed by the oxidation of pyrite-rich deposits.
Geologic map unit (-155.222257574787, 59.418103983455)
Age of mineralization Jurassic or Tertiary, depending on the age of the volcanic hostrock.
Alteration of deposit Pyritization of tuff and chert.

Production and reserves

Workings or exploration The Aukney claim was located on October 16, 1908 (Martin and Katz, 1910; 1912). The only work reported was blasting the shoreline cliff face.
Indication of production None