Unnamed (near southwest end of Midnight Dome)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu
Ore minerals gold; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-1
Latitude 67.4597
Longitude -150.1562
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of 3,700 feet, 0.2 mile west of hill 3860 on the south end of Midnight Dome. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of sulfide-bearing quartz veins in schist or quartzite (Eden, 2000). A sample of vein quartz found in float contains pyrite, malachite, and limonite, 179 ppb gold and 1,469 ppm copper. A sample of quartz vein collected in place contains pyrite and limonite, and 532 ppb gold. Eden (2000) interprets this occurrence as an extension of the system of auriferous quartz veins in the Nolan area. The rocks in the area are Upper Devonian chloritic schist and chloritic quartzite (Eden, 2000).
Geologic map unit (-150.158947395062, 67.4592743933357)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Alteration of deposit Iron-oxide alteration.

Production and reserves

Workings or exploration Only limited surface sampling and geologic mapping.
Indication of production None

References