Ganes Creek

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities Pb; Sb; Sn; W; Zn
Ore minerals chalcopyrite; galena; jamesonite; pyrite; tetrahedrite; wolframite
Gangue minerals axinite; fluorite; quartz; topaz; tourmaline; white mica

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale D-2
Latitude 62.85673
Longitude -156.95406
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 3,000 feet in a saddle on a north-south-trending ridge that separates two forks of Billy Goat Creek from the cirque at the head of Ganes Creek. The prospect is about 0.7 mile west-southwest of peak 3440 and about 0.6 mile south-southwest of the center of section 15, T. 32 N., R. 41 W., of the Seward Meridian. The location is accurate. This site is sometimes called the 'Ganes Creek' prospect, but it should not confused with the large placer mine further down Ganes Creek.

Geologic setting

Geologic description

This prospect consists of a sulfide-bearing veins and veinlets with tourmaline, quartz, fluorite, and white mica; it occurs in a small quartz porphyry body that intrudes andesitic roof pendants that overlie the Beaver Mountains volcanic field (Bundtzen and Laird, 1982; Miller and Bundtzen, 1994). The quartz porphyry intrusion is probably a phase of the composite Beaver Mountains pluton that has been dated at 70.3 Ma. Szumigala (1993, 1996) who investigated this area for Battle Mountain characterizes the prospect as in the northern part of the 'south quartz zone'.
The deposit is controlled by a near-vertical fracture set that strikes about N75-80E. The deposit is possibly part of a mineralized trend that extends from the Cirque prospect (ID009) northeast to the head of Ganes Creek, a distance of more than 1.8 miles. The mineralization consists of parallel quartz-white mica-tourmaline-sulfide veins, 1 to 7 inches thick within the tourmalinized, quartz-porphyry intrusion. A sulfide-bearing zone about 50 by 100 feet in size that was sampled by Anaconda Minerals Company contains abundant fluorite, axinite, and topaz (D.B. Obolewicz, written communication, 1981). Veins with quartz and white mica typically have a vuggy coxcomb texture whereas the tourmaline-axinite- rich zones are tight; this suggests the deposit was formed by several different hydrothermal fluids over a period of time.
Samples collected by the U.S. Geological Survey and the Alaska Division of Geological and Geophysical Surveys contained up to 332 parts per million (ppm) silver, 8.00 percent copper, 100 ppm antimony, and 100 ppm tin (Bundtzen and Laird, 1982; Miller, Bundtzen, and Gray, 2005). Samples collected by Anaconda Minerals (D.B. Obolewicz, written communication, 1981) contained up to 3,400 ppm copper, more than 2.00 percent lead, 450 ppm zinc, more than 100 ppm silver, more than 2,000 ppm tungsten, 250 parts per billion (ppb) gold, more than 1,000 ppm arsenic, 425 ppm tin, and 330 ppm antimony. One grab sample collected by Battle Mountain Mining Company contained 52.4 ppm gold and 1.53 percent lead (Szumigala, 1993). The high lead values in grab samples can be attributed to visible galena in hand specimens. The high copper and silver values found in the grab samples might be attributed to tetrahedrite and jamesonite observed in hand specimens. Wolframite was also identified in hand specimens.
Geologic map unit (-156.956417124082, 62.8560736992817)
Mineral deposit model Sn-polymetallic veins (Cox and Singer, 1986; model 20b).
Mineral deposit model number 20b
Age of mineralization Undated; may be related to emplacement of the Beaver Mountains stock which has been dated at 70.3 Ma (Bundtzen and Laird, 1982).
Alteration of deposit Development of greisen with tourmaline, quartz, axinite, white mica, and topaz.

Production and reserves

Workings or exploration Personnel from the U.S. Geological Survey and Alaska Division of Geological and Geophysical Surveys sampled the deposit in 1981. In 1981, Anaconda Minerals examined the prospect (D. Obolewicz, written communication, 1981). Szumigala (1993, 1996) investigated the prospect in the late 1980s, while working for Battle Mountain Mining Company.
Indication of production None

References

References

Reporters T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.), M.L. Miller (U.S. Geological Survey); and C.C. Hawley (Hawley Resource Group)
Last report date 5/16/2003