Littlejohn

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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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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