Prospect, Undetermined

Commodities and mineralogy

Main commodities Ag; As; Au; Cu; Pb; Zn
Ore minerals arsenopyrite; chalcopyrite; galena; hematite; pyrite; sphalerite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale D-4
Latitude 67.7697
Longitude -148.9938
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Cindy prospect is about 7.3 miles at an azimuth of 24 degrees from the central (5425) peak of Horace Mountain and about 1.2 miles north-northeast of peak 5150. It is near the center of section 18, T. 34 N., R. 6 W. Kurtak and others (2002) include a map showing the regional geology of the area and the location of this and the other deposits of the Chandalar Copper Belt.

Geologic setting

Geologic description

The Cindy prospect was staked by Placid Oil Company in 1972 and explored by them until 1977 (Kurtak and others, 2002). It was also one of the prospects listed in a report by Ventures Resources Corp. (1999) about their exploration of the Chandalar Copper Belt.
The Cindy prospect is at the northeast end of the Chandalar Copper Belt which is characterized by copper skarn deposits (Newberry and others, 1986). The rocks in the vicinity of the prospect are mainly lower Paleozoic greenschist, calcareous schist, and marble in thrust contact with Devonian Hunt Fork Shale and Silurian and Devonian Skajit Limestone (Brosgé and Reiser, 1964). Massive pyrite, galena, and chalcopyrite occur in veins and pods in silicified marble (Kurtak and others, 2002) Two samples from outcrop averaged 955.5 parts per billion (ppb) gold, 48.5 parts per million (ppm) silver, 225 ppm copper, 809.5 ppm lead, and 14,514 ppm arsenic. A float sample of massive hematite with 5 percent galena contained 144 ppb gold, 15 ppm silver, 1,591 ppm copper, 4.24 percent lead, 21.01 percent zinc, and 1,038 ppm arsenic. The mineralization appears to be limited to an area of about 500 square feet.
Geologic map unit (-148.996561252533, 67.7693063070949)
Mineral deposit model Silicified marble with lead, silver, and copper.
Age of mineralization Probably a distal deposit of the Chandalar Copper Belt and thus Devonian(?) based on Early Devonian Pb/Pb zircon ages from the Baby Creek batholith and Horace Mountain plutons which are thought to be genetically tied to the mineralization of the belt (Dillon and others, 1996).
Alteration of deposit Silicification of marble.

Production and reserves

Workings or exploration The Cindy prospect was staked by Placid Oil Company in 1972 and explored by them until 1977 (Kurtak and others, 2002). Sampled by Bureau of Land Management.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

This prospect is on Doyon Ltd. selected lands; for more information, contact Doyon Ltd., Fairbanks, Alaska.
MAS No. 0020310144


MRDS Number 10307341


Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
Newberry, R.J., Allegro, G.L., Cutler, S.E., Hagen-Levelle, D.D., Adams, D.D., Nicholson, L.C., Weglarz, T.B., Bakke, A.A., Clautice, K.H., Coulter, G.A., Ford, M.J., Myers, G.L., and Szumigala, D.J., 1997, Skarn deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 355-395.
Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
Nicholson, L.M., 1990, Porphyry copper, copper skarn, and volcanogenic massive sulfide occurrences in the Chandalar copper district, Alaska: Fairbanks, University of Alaska, M.Sc. thesis, 164 p.
Ventures Resource Corp., 1999, 1999 Annual Report: Ventures Resource Corporation, 36 p.
Reporters J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)
Last report date 4/18/2010