The Three Castle Mountain is a zinc and lead 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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Three Castle Mountain MRDS details
Site Name
Primary: Three Castle Mountain
Commodity
Primary: Zinc
Primary: Lead
Secondary: Uranium
Secondary: Silver
Location
State: Alaska
District: Black
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
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Gossans and local silicification of limestone, along a northeast-trending fault.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Comments
Comment (Geology): Geologic Description = The Three Castle Mountain area is underlain by limestone, shale, and dolomite from the upper Tindir Supergroup (Dover and Miyaoka, 1988). The Three Castle Mountain prospects lie 7 miles southwest of the Nation Gossan prospects (CY021); they exhibit the same type of mineralization and may be part of the same system (Northstar Exploration, Inc., 1999). The Three Castle Mountain prospects consist of northeast-trending gossans that are associated with sulfide mineralization in limestone fault breccias that may be thrust breccias. Lead, zinc, and silver anomalies are common in soil samples, with lead and zinc values ranging from 1,000-10,000 parts per million, and silver ranging from 0.1 to 0.5 ounces per ton. A dolomite sample with secondary silica and traces of pyrite also contained 3.25 parts per million uranium (Northstar Exploration, Inc., 1999). The Three Castle Mountain area has been explored since the mid-1970s by soil and rock sampling.
Comment (Geology): Age = Proterozoic or younger.
Comment (Reference): Primary Reference = Northstar Exploration, Inc., 1999
Comment (Workings): Workings / Exploration = The area has been explored since the mid-1970's by soil and rock sampling.
Comment (Deposit): Model Name = Fault-controlled Zn-Pb?
Comment (Exploration): Status = Active
Comment (Deposit): Other Comments = These prospects are located on Doyon, Limited selected or conveyed land. For more information, contact Doyon, Limited. This site is within the Yukon-Charley Rivers National Preserve.
References
Reference (Deposit): Northstar Exploration, Inc., 1999, 1998 Annual Report Kandik, Block 7: Fairbanks, Alaska. (Report held by Doyon, Limited, Fairbanks, Alaska.)
Reference (Deposit): Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.
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