| Basis for focus area |
MRDS past producers and Cannon and others (2017). |
| Identified resources |
Identified resources and historical production of manganese. |
| Production |
Three Kids mine (1917-1961): 2,225,000 tons of ore mined and treated, with 15-40% Mn. Total production from the district exceeded 1,000,000 tons of manganese ore (Longwell and others, 1965). |
| Status |
Past mining. |
| Estimated resources |
Three Kid mine: Resource of 7,230,000 metric tons ore, grading 13.2% Mn for 954.000 metric tons of contained Mn (Cannon and others, 2017). |
| Geologic maps |
Stewart and Carlson (1978), scale 1:500,000; Longwell and others (1965), scale 1:250,000. |
| Geophysical data |
Inadequate Rank 3 aeromagnetic and Rank 5 aeroradiometric coverage. |
| Favorable rocks and structures |
Manganese deposits are in sandstone and siltstone beds of the Pliocene(?) Muddy Creek Formation, which overlies a thick series of Tertiary(?) volcanic rocks (Longwell and others, 1965). |
| Deposits |
Three Kids deposit (MRDS dep_id: 10037203), Red Chief claim (MRDS dep_id: 10037204), Fannie Ryan (MRDS dep_id: 10197443). |
| Evidence from mineral occurrences |
MRDS. |
| Geochemical evidence |
Wad (hydrous Mn oxide) is the principal ore mineral; psilomelane, pyrolusite, manganite, and neotocite are also reported (Longwell and others, 1965). |
| Geophysical evidence |
Unknown. |
| Evidence from other sources |
None. |
| Cover thickness and description |
Exposed at the surface, mined from open pits. |
| Authors |
David A. Ponce. |
| New data needs |
Geologic mapping, geophysics. |
| Geologic mapping and modeling needs |
Updated geologic mapping. |
| Geophysical survey and modeling needs |
High-resolution, Rank 1 aeromagnetic and aeroradiometric surveys. |
| Digital elevation data needs |
Lidar inadequate. |
