Unnamed (Adams Inlet)

Prospect, Inactive

Commodities and mineralogy

Main commodities Mo
Ore minerals molybdenite

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale D-1
Latitude 58.85
Longitude -136.05
Nearby scientific data Find additional scientific data near this location
Location and accuracy A molybdenite occurrence was reported by Buddington and Chapin (1929, p. 330) on the north side of Adams Inlet; apparently the same locality was cited by Smith (1942, p. 178). MacKevett and others (1971) found altered amygdaloidal basalt with somewhat anomalous molybdenum for a distance of about 500 feet on the north shore about 2.3 miles up the Inlet in the Juneau D-6 quadrangle, but apparently did not find the locality referred to by Buddington and Chapin. The coordinates are for a point just east of Pt. George, about at the point shown by Cobb (1972). The location is uncertain but is geologically reasonable.

Geologic setting

Geologic description

Granite of Cretaceous age forms a batholithic mass that crops out on Point George and extends northerly to the Klotz Hills. Another granitic intrusion, about 1 mile across, occurs on the north side of Adams Inlet 1 mile east of the granite exposed on Point George. The two granitic intrusives are separated by volcanic and sedimentary rocks of Devonian and Silurian age (Brew and others, 1978, pl. 1A).
Buddington and Chapin (1929, p. 330) reported molybdenite as coatings on fracture surfaces in metamorphic rocks, mainly hornfels and tactite, on the north side of Adams Inlet. The molybdenite occurrence is inferred to be in the belt of sedimentary and volcanic rocks that separates the major granitic intrusion exposed on Point George from the smaller mass exposed in Adams Inlet about two miles east of Point George.
Geologic map unit (-136.051872879609, 58.8496150477995)
Mineral deposit model Tactite or skarn molybdenum occurrence.
Age of mineralization Cretaceous or younger.

Production and reserves

Workings or exploration Ten claims reported in 1912 (Kimball and others, 1978, p. C351); there are no obvious workings.
Indication of production None

Additional comments

The site is in Glacier Bay National Park and Preserve.

References