North Fork Group

The North Fork Group is a gold, silver, and lead mine located in Carbon county, Wyoming at an elevation of 7,680 feet.

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: North Fork Group
Secondary: Pease Properties
Secondary: claims: North Fork, Tablespoon

Commodity

Primary: Gold
Primary: Silver
Primary: Lead
Secondary: Copper
Secondary: Zinc
Tertiary: Iron

Location

State: Wyoming
County: Carbon
District: Encampment District

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Underground

Ownership

Owner Name: Boston Sierra Madre Mine Industry Company

Production

Not available

Deposit

Record Type: Site
Operation Category: Prospect
Deposit Type: Vein
Operation Type: Unknown
Mining Method: Unknown
Discovery Year: 1906
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Rocky Mountain System
Physiographic Province: Southern Rocky Mountains

Mineral Deposit Model

Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Type: R
Structure: NE trending fault crosses the properties

Type: L
Structure: dikes trend NW and dip NE, and are cut by N45W-trending qtz vein

Alterations

Not available

Rocks

Not available

Analytical Data

Analytical Data: Galena ore ran as high as 600 opt Ag. Oxidized ore ran 33-73 opt Au. Avg. ore $36.39/ton combined Au+Ag+Pb at 1905 prices.

Materials

Ore: Silver
Ore: Azurite
Ore: Malachite
Ore: Limonite
Ore: Sphalerite
Ore: Galena
Ore: Chalcopyrite
Ore: Pyrite

Comments

Comment (Identification): Do not confuse North Fork group with North Fork Mine.

Comment (Geology): Granite and diorite dikes trend NW and dip NE, and are cut by N45W-trending qtz vein (North Fork vein). A N88E-trending crosscut vein cuts the N. Fork vein.

Comment (Analytical Data): Max. values: Ag 600 opt; Au 73 opt. Avg. workable ore: $36.39 per ton in Au, Ag, & Pb (1905 prices) (Beeler, 1905).

Comment (Deposit): Vein is 6 to 26 in wide at a depth of 160 ft.; Boston Sierra Mine Industry Co. reported a 1700 ft long pay streak with a 300 ft long by 6 to 18 in wide ore shoot. Cross-cut vein is 23 ft wide and mineralized throughout much of its width.

Comment (Geology): NE trending fault crosses the properties

Comment (Identification): May contain the Pease Properties.

References

Reference (Deposit): Osterwald and others, 1959, Mineral Resources of Wyoming: Geological Survey of Wyoming Bull. 50, p. 45, 77, 109, 113, 157, 219.

Reference (Deposit): Osterwald and others, 1966, Mineral Resources of Wyoming: Geological Survey of Wyoming Bull. 50 [revised ed.], p. 48, 83, 121, 126, 174, 240.

Reference (Deposit): Hausel, 1986, Mineral deposits of the Encampment mining district, Sierra Madre, Wyoming-Colorado: Geological Survey of Wyoming RI-37, p. 21.

Reference (Deposit): Hausel, 1989, The geology of Wyoming's precious metal lode and placer deposits: Geological Survey of Wyoming Bull. 68, p. 157.

Reference (Deposit): Hausel, 1997, Copper, lead, zinc, molybdenum, and associated metal deposits of Wyoming: Wyoming State Geological Survey Bull. 70, p. 175.

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