Mine detail: National Gypsum Co. Shoals Mine

Previously called 'Shoals'

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Location

Lat / long:

38.68338, -86.71527

Resource(N)

Primary:	Gypsum-Anhydrite
Ore:	Anhydrite, Gypsum
Gangue:	Calcite, Chlorite, Dolomite, Illite, Quartz
Orebody form:	LINEAR
Discovery year:	1951

Production

Operation type:	Unknown
Deposit type:	Sedimentary
Production size:	Large
Development status:	Producer
First production started:	1955

Geology

Host rock:	St. Louis Limestone (Lower Member)
Host type:	Evaporite
Structure:	Cincinnati Arch Trends Nw-Se Through North Central Indiana.
Tectonic:	Illinois Basin-Shallow Marine Environment Southwest Of Cincinnati Arch.
Alteration processes:	Dissolution And Leaching By Ground Water May Remove Some Gypsum

References

MRDS	W032229
DEP	10080847
Reporter	Sutphin, David M.