Von Frank - South

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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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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