Turtle Mountains manganese

Region Central, North Central
Mineral systems
Deposit types
Critical minerals
Other minerals

Information leading to the delineation of this focus area

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.