The Whirlwind is a lead and silver 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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Whirlwind MRDS details
Site Name
Primary: Whirlwind
Commodity
Primary: Lead
Primary: Silver
Secondary: Arsenic
Secondary: Copper
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: Polymetallic veins
Orebody
Not available
Structure
Not available
Alterations
Not available
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Arsenopyrite
Ore: Galena
Gangue: Quartz
Comments
Comment (Commodity): Gangue = Carbonate
Comment (Reference): Primary Reference = DiMarchi and others, 1992
Comment (Workings): Workings / Exploration = The Whirlwind Prospect was discovered in 1991 by ASA Inc. during regional exploration on lands selected by Doyon Ltd. Grab samples collected by DiMarchi and others (1992) contain as much as 276 ppm copper, 1.4 ppm silver, 396 ppm lead, and 6,192 ppm arsenic.
Comment (Deposit): Other Comments = The Whirlwind prospect is on lands selected or owned by Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.
Comment (Geology): Geologic Description = The Whirlwind prospect consists of veinlets and replacement zones near the contact of a composite pluton with Cretaceous flysch. The composite pluton, which is composed of pyroxenite, gabbro, and monzonite, is elongated parallel to the northeast trending ridgeline (Patton and others, 1980). Galena and arsenopyrite occur in replacement zones at the contact and as grains in mafic phases of the pluton. The pluton is marked by an elongated aeromagnetic high (Patton and others, 1982). The Whirlwind prospect is inferred to be Late Cretaceous, based on isotopic ages of the host pluton (Moll and others, 1981). Grab samples collected by DiMarchi and others (1992) contain as much as 276 ppm copper, 1.4 ppm silver, 396 ppm lead, and 6,192 ppm arsenic.
Comment (Deposit): Model Name = Polymetallic veins (Cox and singer, 1986; model no. 22c)
Comment (Geology): Age = The Whirlwind prospect is inferred to be Late Cretaceous, based on isotopic ages of the host pluton (Moll and others, 1981).
Comment (Exploration): Status = Inactive
References
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): Patton, W.W., Jr., Cady, J.W., and Moll, E.J., 1982, Aeromagnetic interpretation of the Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-E, 15 p., 2 sheets, scale l:250,000.
Reference (Deposit): DiMarchi, J.J., Weglarz, T.B., Freeman, L.K., Nicholson, L.C., and Barker, J.C., 1992, Annual Report for 1992--Doyon Option Lands, Block 10: ASA Inc. Report, 121 pages (Report held by Doyon Ltd., Fairbanks, Alaska.)
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