Unnamed (north of Return Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Hg; Sb
Other commodities As
Ore minerals iron oxide
Gangue minerals carbonate; quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale A-6
Latitude 62.05144
Longitude -158.50639
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a ridge about 0.4 mile north of Return Creek, a tributary of Montana Creek. The occurrence is at an elevation of about 950 feet; it is about 0.2 mile east-northeast of hill 904 and 0.3 mile southeast of the center of section 30, T. 23 N., R. 50 W., of the Seward Meridian. The location is approximate.

Geologic setting

Geologic description

This occurrence consists of quartz-carbonate veins in reddish-orange, iron- oxide-stained volcanic flows and tuffs of the Iditarod volcanics (Miller and Bundtzen, 1988). Locally the volcanic rocks are cut by thin altered felsic dikes (Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). As seen in rubble crop, the individual quartz-carbonate veins are up to 4 inches thick. There are shallow prospect pits adjacent to the quartz-carbonate veins. A grab sample of the vein material contained 930 parts per billion (ppb) mercury, 110 parts per million (ppm) arsenic, and 10 ppm antimony (McGimsey and others, 1988).
Geologic map unit (-158.508807061114, 62.0507455685614)
Mineral deposit model Quartz-carbonate veins.
Alteration of deposit Iron oxide alteration of volcanic rocks.

Production and reserves

Workings or exploration Samples were collected by the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys in the 1980s (McGimsey and others, 1988).
Indication of production None

References