Little Mo Mine

The Little Mo Mine is a uranium mine located in Fremont county, Wyoming.

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

Name: Little Mo Mine  

State:  Wyoming

County:  Fremont


Commodity: Uranium

Lat, Long: 43.41, -107.89600

Map: View on Google Maps

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Satelite image of the Little Mo Mine

Little Mo Mine MRDS details

Site Name

Primary: Little Mo Mine
Secondary: Arrowhead No. 1 Claim
Secondary: Arrowhead Mine
Secondary: Arrowhead #1 Claim


Primary: Uranium


State: Wyoming
County: Fremont
District: Copper Mountain uranium mining district

Land Status

Not available


Not available


Not available


Owner Name: Little Missouri Mining Co. (Little Mo)
Info Year: 1966
Years: 1955 -

Owner Name: Susquehannah-Western Inc.
Info Year: 1966

Owner Name: Western Nuclear Inc.


Not available


Record Type: Site
Operation Category: Past Producer
Operation Type: Surface
Mining Method: Open Pit
Year First Production: 1955
Year Last Production: 1964
Years of Production:
Significant: N
Deposit Size: S


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

Mineral Deposit Model

Not available


Not available


Not available


Not available


Name: Conglomerate
Role: Host
Age Type: Host Rock Unit
Age Young: Eocene

Name: Conglomerate
Role: Host
Age Type: Host Rock
Age Young: Eocene

Analytical Data

Not available


Ore: Meta-Autunite
Ore: Uranophane
Ore: Uraninite
Ore: Coffinite
Unknown: Marcasite


Comment (Location): Bull. 50 and MINOBRAS puts mine in NW4 of Sec. 29. RME-3137 and RME-3125 put it in Sec. 29. Anomaly is in SE4 of NE4 of Sec. 29. Deleted and merged records also say Sec. 28. Largest surface disturbance in the area is on the boundary of Sec. 28 and 29.


Reference (Deposit): USAEC-PRR-DEB-P-2-2202

Reference (Deposit): CONSV. DIV. COMP. DATE, 11-00-1958

Reference (Deposit): Gruner, J.W., Smith, D.K., Jr., and Knox, J.A., 1956, Annual REPORT FOR PERIOD APRIL 1, 1955 TO March 31, 1956. Part II: U.S. Atomic Energy Commission RME-3137, part II, 24 p.
Pages: p. 9.

Reference (Deposit): Gruner, J.W., and Smith, D.K., Jr., 1955, PROGRESS REPORT NO. 10 FOR PERIOD APRIL 1 TO OCTOBER 1, 1955: U.S. Atomic Energy Commission RME-3125, 19 p.
Pages: p. 15.

Reference (Deposit): DMEA Docket No. 4709, 1957, 654 p.,

Reference (Deposit): Osterwald and others, 1966, Mineral Resources of Wyoming: Wyoming Geological Survey Bulletin 50, 287 p.
Pages: p. 213.


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