| Basis for focus area |
Focus area includes small cold-spring manganese deposits in glacial sediment overlying/incorporating Cretaceous marine strata along the southern margin of the Turtle Mountains. |
| Identified resources |
Identified resources for manganese. |
| Production |
No current production. |
| Status |
No known production or exploration. |
| Estimated resources |
The Mineral Spring deposit may contain ~16,000 tones of manganese ore (rancieite in calcareous tufa) with an average of 10% Mn (Hendricks and Laird, 1943). |
| Geologic maps |
Clayton and others (1980), scale 1:500,000; Deal (1971), scale 1:126,720; Bluemle (1985), scale 1:128,200. |
| Geophysical data |
Inadequate aeromagnetic and aeroradiometric coverage. |
| Favorable rocks and structures |
Glacial till and outwash overlying Cretaceous marine sediments (Fox Hills and Pierre Formations). |
| Deposits |
Mineral Spring deposit (MRDS dep_id: 10199865). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
No data. |
| Geophysical evidence |
No data. |
| Evidence from other sources |
No data. |
| Comments |
Box and Cossette (2020) state that the deposits are small and relatively low-grade and no mining has ever occurred. |
| Cover thickness and description |
Glacial cover around 100 ft in thickness, but deposits are within the glacial till. |
| Authors |
Laurel G. Woodruff, Ed Murphy, Levi Moxness, Ned Kruger. |
| New data needs |
Geological mapping. |
| Geologic mapping and modeling needs |
No mapping more recent than 1966. 1:24:000 scale surface mapping needed. |
| Geophysical survey and modeling needs |
Geophysical methods not useful. |
| Digital elevation data needs |
Lidar inadequate. |
