Smog

Occurrence, Active?

Commodities and mineralogy

Main commodities Pb; Zn
Other commodities Ag; Au; Cu
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals chlorite; quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale D-1
Latitude 63.99
Longitude -147.39
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,200 feet, on the north side of an east-flowing tributary to upper Slide Creek. The map site is about 1.7 miles northeast of VABM 6463 (Art), in the SE1/4 of sec. 5, T. 11 S., R. 2 E., of the Fairbanks Meridian. The location is accurate to within 1.5 miles. This is locality 6 of Cox and others (1989).

Geologic setting

Geologic description

The country rock in the area of this occurrence is the Lower Mississippian to Middle Devonian Totatlanika Schist. The deposit is in schist and consists of lenses of massive chalcopyrite, galena, pyrite, and sphalerite, accompanied by chlorite, quartz, and sericite (www.grayd.com, 1999).
Geologic map unit (-147.392333286671, 63.9895723294736)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a)
Mineral deposit model number 28a
Age of mineralization The deposit is interpretted to have formed synchronously with the deposition of the mid-Paleozoic protoliths of the Totatlanika Schist.
Alteration of deposit Footwall alteration zones contain chlorite and sericite.

Production and reserves

Workings or exploration In February 2016, White Rock Minerals Ltd. announced the proposed acquisition of the Red Mountain polymetallic volcanogenic massive sulfide (VMS) project in the north-central Alaska Range, with two known deposits: Dry Creek (101 historical drill holes for 13,831 m) and West Tundra Flats (26 historical drill holes for 5,349 m). As of May 2016, White Rock acquired 100 percent ownership of the property. In March 2016, White Rock Minerals Ltd. staked 85 new mining claims in the Bonnifield district. In June through August 2016, White Rock focused on identifying high-priority magnetic, conductivity, and geochemical targets for future follow-up work utilizing geochemical vector analysis, detailed geologic maps published by DGGS, and contracted detailed interpretation of a DGGS airborne magnetic and electromagnetic survey of the area (Burns and others, 2016). The resulting integrated assessment led to an additional 114 claims being staked and prioritization of the Dry Creek West, ReRun, West Tundra Flats, and Glacier target areas as highly prospective for additional VMS deposits, which are included within 30 geochemical-geophysical targets classified as of high interest (Athey and Werdon, 2017).
Indication of production None

References

MRDS Number 10307554

References

Reporters N. Van Wyck (Stevens Exploration Management Corporation); M.B. Werdon (DGGS)
Last report date 8/26/2017