Unnamed (on hill 1355 west of Donlin Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Hg
Other commodities As; Sb; Zn
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale A-5
Latitude 62.06752
Longitude -158.25618
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on hill 1355, slightly more than 1 mile west of Crooked Creek; in the SE1/4 of section 21, T. 23 N., R 49 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is a zone of quartz veins in iron-oxide-coated sandstone of the Upper Cretaceous, Kuskokwim Group, lesser iron-oxide stained lithic tuff, and small felsic dikes that cut the sedimentary rocks (Cady and others, 1955; Miller and Bundtzen, 1994; Miller, Bundtzen, and Gray, 2005). A grab sample of sandstone contains elevated As and Sb. The tuff contains elevated As (20 ppm), Sb (18 ppm), and Zn (110 ppm). A grab sample of felsic dike contains 2.3 ppm Hg. The quartz vein material contains 0.94 ppm Hg. A blue-green mineral identified by x-ray diffraction to be dickite(?) (analyst Elizabeth Bailey, USGS) coats some of the fracture surfaces (McGimsey and others, 1988).
Geologic map unit (-158.258591842601, 62.0668270186827)
Alteration of deposit Alteration marked by clay (dickite) and iron oxides.

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). Westgold prospected the area for gold from 1988 to 1990, and Placer Dome Exploration conducted detailed rock chip and soil surveys of the area from 1995 to 1999. More recently, Novagold Resources has collected surface samples from the general area. The results of these investigations are not known.
Indication of production None

References