Unnamed (near Skwentna River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb
Ore minerals chalcopyrite; galena; native gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TY
Quadrangle map, 1:63,360-scale D-7
Latitude 61.96
Longitude -152.3
Nearby scientific data Find additional scientific data near this location
Location and accuracy The location of this occurrence is approximated from Spurr (1900, p. 110-112, June 24 campsite; U.S. Bureau of Mines, 1998, MAS # 0020840014; MacKevett and Holloway, 1977, p. 76, locality 4; and Cobb, 1972, MF 385, locality 5) in Section 25, T. 22 N., R. 17 W. One of the reporters (Millholland) was unable to located the occurrence in the field using the localites cited above.

Geologic setting

Geologic description

Folded volcanic rocks are cut by granitic dioritic and syenitic dikes. Rock along contacts between dikes and volcanics are decomposed and iron stained (Spurr, 1900, p. 110-112). Narrow quartz veins up to several inches wide are rich in pyrite, chalcopyrite and galena. Other zones near, but not at, contacts generally follow stratification, are similarly mineralized and contain gold and silver. Upstream, black slate is cut by granitic dikes; quartz veins carry pyrite, chalcopyrite and galena. Assay of sample with pyrite and chalcopyrite assayed 0.05 oz/ton gold and 0.15 oz/ton silver. Assay of a quartz vein sample returned 0.1 oz/ton gold and 0.25 oz/ton silver (Spurr, 1900, p. 259). The basic reference was published in 1900; no more recent information is available.
Geologic map unit (-152.302226910138, 61.9594283952634)
Mineral deposit model Hydrothermal/contact metamorphic?, polymetallic vein?, disseminated? (MacKevett and Holloway, 1977).

Production and reserves

Workings or exploration Prospecting with rock sample assayed.
Indication of production None

Additional comments

The basic reference was published in 1900; no more recent information is available.

References