| Basis for focus area |
Mines clustered around Fredericktown, Missouri, includes the current Madison mine project area. |
| Identified resources |
Identified resources for copper, cobalt, and nickel. Historical production of cobalt, copper, lead, nickel, and zinc. |
| Production |
1827-1959 Pb-Cu production; Mine La Motte was the primary domestic source of Ni at various periods in the 1800s. Lead production from 1923-1961 is estimated as 575,000 tons of contained metal. Zinc, Cu, Ag, Co, and Ni were important byproduct (Kiilsgaard and others, 1967). |
| Status |
Past mining, current exploration. |
| Estimated resources |
Madison mine project contains an estimated 35 million lbs Co, 51 million lbs Ni, and 65 million lbs Cu. |
| Geologic maps |
Robertson (1961), scale 1:62:500; Grenia (1959), scale 1:62,500. |
| Geophysical data |
Adequate Rank 1 magnetic and aeroradiometric data available (McCafferty and others, 2019). |
| Favorable rocks and structures |
Ores are in the lower 50 feet of the Bonneterre Formation and in places the upper 15 feet of the Lamotte Sandstone. The Higdon deposit is in the Bonneterre Formation, about 1500 feet below the surface. |
| Deposits |
Fredericktown district (USMIN Site_ID MO00001): Madison mine (MRDS dep_id: 10010082), Higdon mine (MRDS dep_id: 10219296), Catherine, Hickory Nut, Ruth, Fleming: Mine La Motte mines include Seed-Tick, Rattlesnake, Wildcat, Bluff, Copper Mine, Jack, Hardscrabble. |
| Evidence from mineral occurrences |
MRDS; USMIN; Missouri Geological Survey database Inventory of Mines; Occurrences and Prospects (Missouri Geological Survey, 2021b). |
| Geochemical evidence |
Unknown, may be data in files at the Missouri Geological Survey files; known favorable mineralogy. Average ore grades from the Frederickton district were about 3% Pb, 0.09% Cu, 0.25% Ni, and 0.2% Co. |
| Geophysical evidence |
Combination of gravity with aeromagnetic data. |
| Evidence from other sources |
Drill core and mine information. |
| Comments |
The majority of the ore bodies contain mainly lead with minor zinc, copper, nickel, and cobalt, although some deposits or parts of deposits can contain significant amounts of copper, nickel, and cobalt. |
| Cover thickness and description |
Less than 500 feet. |
| Authors |
Cheryl M. Seeger, Warren C. Day. |
| New data needs |
Drill core logs, new 1:24,000 scale geologic maps. Geochemical sampling of mine waste. |
| Geologic mapping and modeling needs |
Modern 1:24,000 scale geologic maps for southern portion, drill core logs, and 3-D geologic model. |
| Geophysical survey and modeling needs |
Explore use of EM; airborne magnetic data recently acquired. |
| Digital elevation data needs |
Lidar adequate. |
