Operated between late 1979 and 1993 by the Ozark-Mahoning Company. The Denton mine, along with the Annabel Lee and Minerva #1 mines were the most productive fluorspar mines during the last phase of mining in the Southern Illinois fluorspar district. The Denton Mine was also a prolific specimen-producer.
Ref.: (in part): Rocks & Min.:63:211 & 64:18, Mineralogical Record, 28:1.
References:
Econ Geol. (1992) 87:172-181