Unnamed (on Raggedtop Mountain)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Pb
Ore minerals galena; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale A-6
Latitude 61.02
Longitude -149.13
Nearby scientific data Find additional scientific data near this location
Location and accuracy On northeastern flank of Raggedtop Mountain, 2,400 ft east-northeast of summit (peak 5,215). Accurate within 2,000 ft. This is the prospect location from plate 33 of Park (1933).

Geologic setting

Geologic description

According to Park (1933) a quartz vein, apparently shattered from postmineral movement, cuts Late Cretaceous metasedimentary rocks of the Valdez Group. The metasedimentary rocks are in close proximity to quartz diorite or dacite dikes, sills, irregular pipes, or plugs. The vein strikes N 50 W, dips 40 W, and ranges from 1-24 inches thick with about 7 inches being the average thickness. The vein contains galena, pyrite, and limonite. Numerous small mineralized stringers were seen on the steep mountain side south of this location. Samples taken indicate 0.01 oz/ton Au, 1.4 oz/ton Ag, and 1.12 percent Pb (Park, 1933). Other nearby small prospects have several small but well-mineralized quartz veins that cut both intrusive and metasedimentary rocks.
Geologic map unit (-149.132185665276, 61.0194339366291)
Mineral deposit model Chugach-type low-sulfide Au-quartz veins (Bliss, 1992; model 36a.1).
Mineral deposit model number 36a.1
Age of mineralization Tertiary or younger; veins cut Late Cretaceous Valdez Group rocks and Tertiary intrusive rocks.
Alteration of deposit The intrusive rocks have undergone argillic alteration. Oxidation of iron minerals.

Production and reserves

Workings or exploration Vein exposed in a 2 ft open cut. Samples taken indicate 0.01 oz/ton Au, 1.4 oz/ton Ag, and 1.12 percent Pb (Park, 1933).
Indication of production None

References