Tri-State District

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

Information leading to the delineation of this focus area

Basis for focus area Approximate outline of the Tri-State mining district (Mississippi Valley-type deposits with known Ga, Ge, and In).
Identified resources Historical production of cadmium, gallium, germanium, indium, lead, and zinc.
Production Total production from all three states: 498 Mst of ore, with 2.8 Mst Pb and 11.7 Mst Zn. Past minor production of Cd, Ge, and Ga as byproducts of Zn and Pb extraction (Dressel and others, 1986).
Status Past mining from late 1700s to 1950s in Missouri; mining ended in Oklahoma in 1967, and in Kansas in 1970.
Estimated resources Unknown.
Geologic maps Middendorf and others (1987, 1997), scale 1:250,000; McCauley and Smith (1998), scale 1:250,000.
Geophysical data Inadequate aeromagnetic and aeroradiometric data.
Favorable rocks and structures Mississippian Burlington-Keokuk and Warsaw Formations.
Deposits Kansas; Salway mine, Bendelari mine (MRDS dep_id: 10170013); Oklahoma: Picher (MRDS dep_id: 10200406); Missouri: Joplin, Granby and Wenworth camps, other deposits and occurrences in Missouri Geological Survey database Inventory of Mines, Occurrences, and Prospects (Missouri Geological Survey, 2021b).
Evidence from mineral occurrences MRDS; Missouri Geological Survey database Inventory of Mines; Occurrences and Prospects (Missouri Geological Survey, 2021b).
Geochemical evidence Unknown, but there may be information in files at the Missouri Geological Survey on favorable mineralogy beyond Zn, which is known to exist.
Geophysical evidence No data.
Evidence from other sources Drill core and mine information.
Cover thickness and description Less than 1000 feet.
Authors Cheryl M. Seeger.
New data needs Drill core logs, new 1:24,000 scale geologic mapping. Geochemical sampling of mine waste.
Geologic mapping and modeling needs Modern 1:24,000 scale geologic mapping, drill core logs, and 3-D geologic modeling.
Geophysical survey and modeling needs High resolution aeromagnetic and aeroradiometric coverage needed.
Digital elevation data needs Lidar adequate only in Oklahoma section; inadequate elsewhere.