The Von Frank - South is a gold and copper mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Von Frank - South MRDS details
Site Name
Primary: Von Frank - South
Commodity
Primary: Gold
Primary: Copper
Secondary: Molybdenum
Secondary: Arsenic
Location
State: Alaska
District: McGrath
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Porphyry Cu-Au
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Quartz+sericite+ankerite in diorite intrusion.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Stibnite
Ore: Sphalerite
Ore: Pyrite
Ore: Molybdenite
Ore: Chalcopyrite
Ore: Bournonite
Ore: Arsenopyrite
Gangue: Quartz
Comments
Comment (Geology): Age = Late Cretaceous (69.0 Ma), based on biotite age in host diorite (Bundtzen and others, 1994).
Comment (Reference): Primary Reference = DiMarchi and others, 1994
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = ASA Inc. discovered the Von Frank-South prospect in 1992. In 1993, ASA Inc., an Alaskan-based exploration firm, completed 2,000 feet (610 m) of reconnaissance diamond drilling, geologic mapping, and geochemical sampling. Drill intercepts include 429 feet (131 m) with an average grade of 0.013 ounces/ton (0.45 grams/tonne) gold, and 135 feet (41 m) of 0.035 ounces/ton (1.2 grams/ton) gold (Bundtzen and others, 1994). Up to 0.35 percent copper was also detected in drill core, but analytical results from mineralized sample widths were not available. The highest grade surface sample yielded 0.559 ounces/ton (19.1 grams/tonne) gold. Gold and copper have a correlation coefficient of 0.92, with much lower values of gold and other metals (DiMarchi and others, 1994).
Comment (Deposit): Model Name = Porphyry Cu-Au (Cox and Singer, 1986; model no. 20c)
Comment (Geology): Geologic Description = The Von Frank - South prospect is a chalcopyrite-pyrite-(moybdenite) quartz stockwork in a 69 Ma diorite stock, a cupola of the larger Von Frank Mountain monzonitic pluton (Patton and others, 1980; Moll and others, 1981; DiMarchi and others, 1994; Bundtzen and Miller, 1997). Much of the stockwork occurs in joint-fractures with regular N 55 E, 80 SE, and N 45 W, 75 SW orientations. Mineralized veinlets ranged from 1 inch to 6 inches (2.5 cm to 15 cm) thick and total about 15 per every 4 feet (1.2 m). About 90 percent of the stockwork is in plutonic rocks; the remaining 10 percent occurs in hornfels. Sulfides in stockwork from drill core include chalcopyrite, sphalerite, bournonite, stibnite, and pyrite. Bundtzen and Miller (1997) compare the Von Frank - South prospect with other Cu-Au Porphyry prospects in the Kuskokwim Mineral Belt of Southwest Alaska. Drill intercepts include 429 feet (131 m) of 0.13 ounces/ton (0.45 g/tonne) gold, and 135 feet (41 m) of 0.035 ounces/ton (1.2 grams/tonne) gold (Bundtzen and others, 1994). Up to 0.35 percent copper was also present in drill core. The best mineralization from surface samples yielded 0.559 ounces (19.1 grams/tonne) gold. Gold and copper have a correlation coefficient of 0.92 (DiMarchi and others, 1994).
Comment (Commodity): Gangue = carbonate
Comment (Deposit): Other Comments = See Von Frank - North (MD035), Montana Saddle (MD0180), and Neirod - East (MD020) prospects. The Von Frank - South prospect is on land selected or owned by Doyon Ltd. For additional information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
References
Reference (Deposit): Bundtzen, T.K., Swainbank, R.C., Clough, A.H., Henning, M.W., and Hansen, E.W., 1994, Alaska's mineral industry, 1993: Alaska Division of Geological and Geophysical Surveys Special Report 48, 84 p.
Reference (Deposit): Bundtzen, T.K., and Miller, M.L., 1997, Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Economic Geology Monograph #9, Mineral Deposits of Alaska, p. 242-286.
Reference (Deposit): Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.
Reference (Deposit): DiMarchi, J.J., Weglarz, T.B., Adams, D.D., Huber, J., and West, A.W., 1994, Annual Report for 1993--Doyon Option Lands, Volume 1: ASA Inc. Report, 187 p. (Report held by Doyon Ltd., Fairbanks, Alaska.)
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