The Littlejohn is a gold and mercury 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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Littlejohn MRDS details
Site Name
Primary: Littlejohn
Commodity
Primary: Gold
Primary: Mercury
Secondary: Silver
Secondary: Arsenic
Location
State: Alaska
District: Alaska Peninsula
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Epithermal vein, Sado
Model Name: Hot-spring Au-Ag
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Propylitic alteration, inferred from presence of chlorite (Christie, 1974).
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Pyrite
Gangue: Clay
Gangue: Quartz
Comments
Comment (Reference): Primary Reference = Butherus, 1984
Comment (Geology): Age = Pliocene or younger
Comment (Deposit): Other Comments = Good example of how color anomaly evaluation focused on copper porphyry mineralization (Christie, 1974) might miss epithermal gold vein type mineralization.
Comment (Geology): Geologic Description = Strongly argillized vesicular andesite containing areas of silicified rock. Initially reported as having rare quartz veins and disseminated Au and Hg (Trujillo and others, 1982), later work (Butherus, 1984) showed Au and Hg to be limited to vertical fault or shear that localizes reticulated quartz veins.
Comment (Deposit): Model Name = Epithermal gold vein, hot springs gold-silver, Hot spring disseminated gold (Silberman and Berger, 1985).
Comment (Deposit): Model Number = 25a, 25d
Comment (Workings): Workings / Exploration = Christie (1974) reported brief reconnaissance geologic mapping and collection of a few silt samples as part of a porphyry copper evaluation. Trujillo and others (1982) and Butherus (1984) collected 269 samples and did geologic mapping, collecting 45 samples in 1982 and 224 in 1984. Their samples showed gold to 5.6 ppm and silver to 33.2 ppm whereas Christie's (1974) were at background levels.
Comment (Exploration): Status = Inactive
References
Reference (Deposit): Trujillo, R.S., Tapper, C.J., Alvarez, T.J., Porterfield, Ben, and Toupe, W.M., 1982, Exploration and evaluation of precious metal potential of portions of Aleut Corporation lands, southwest Alaska 1982: Unpublished Resource Associates of Alaska report, 91 p, 33 mpas, various scales. (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reference (Deposit): Butherus, D.L., 1984, Exploration and evaluation of northern Akun Island and Walrus Peak-Littlejohn areas, Aleut Native Corporation Lands, 1984: Resource Associates of Alaska, 14 p., 4 appendices (Report held by the Aleut Corporation, Anchorage, Alaska.)
Reference (Deposit): Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
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