Quartz Creek

Mine, Probably inactive

Commodities and mineralogy

Main commodities Au
Other commodities Ag
Ore minerals gold
Gangue minerals amphibole; chlorite; epidote; garnet; ilmenite; magnetite; pyrite; zircon

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1515
Longitude -144.7522
Nearby scientific data Find additional scientific data near this location
Location and accuracy This mine is in the lower part of Quartz Creek, a tributary of the east fork of the upper Chisna River. The mine is at an elevation of about 4,100 feet and is about 0.1 mile southeast of the center of section 30, T. 20 S., R. 16 E., Fairbanks Meridian. The approximate location of the mine was shown by Yeend (1981 [OFR 81-355]). This mine corresponds to locality 25 on figure 6 of Cobb (1979 [OFR 79-238] and locality 11 in table 3 of Nokleberg and others (1991).

Geologic setting

Geologic description

This mine is on Quartz Creek on an alluvial fan at the mouth of the creek, similar to the lower placer deposit at Ruby Creek (Gulch) (MH305). Good 'pay' occurs on false bedrock within the fan and on bedrock at the base of the fan. The gravel is poorly sorted and consists mainly of sand-size angular chips of blue-gray slate and cobbles to 1-foot diameter composed of quartz and igneous and metamorphic rocks probably derived from the 'round wash' conglomerate of Tertiary age (Yeend, 1981 [OFR 81-355]).
Heavy minerals, abundant in the concentrates, consist predominantly of magnetite, but include amphibole, garnet, ilmenite, chlorite, epidote, pyrite, and zircon. Two varieties of gold are present: bright yellow, and orange brown. Some gold has adhering quartz; small nuggets are mostly flattened (Yeend, 1981 [OFR 81-355]).
The placer deposit exploited at the mine is Holocene in age, formed by reconcentration of gold contained in an older alluvial fan and from bedrock sources. 'Round wash' conglomerate of Tertiary age was probably the ultimate source of most of the gold.
Geologic map unit (-144.754429606563, 63.151105287939)
Mineral deposit model Placer Au (Cox and Singer, 1986; model 39a).
Mineral deposit model number 39a
Age of mineralization Holocene deposit formed by reworking of Tertiary and Pleistocene (?) deposits.

Production and reserves

Workings or exploration The property was being mined when visited by Yeend (1981 [OFR 81-355]) in 1979.
Indication of production Yes; small
Reserve estimates Yeend (1981 [OFR 81-355]) estimated that the gold-bearing alluvial fan contained about 600,000 cubic meters of gravel, only part of which would have been of ore grade.

References

References

Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 7/12/2003