Hamp Subdistrict

The Hamp Mines are aligned along the Hamp Fault, which lies along the north flank of Hicks Dome. The fault is very poorly exposed and was primarily mapped through mine notes and previous reports by Baxter and Desborough (1965), Weller et al. (1952), and Bastin (1931). The fault strikes almost due east–west circumferential to the dome and dips steeply to the south at 60% to 75% (Bastin 1931). Because the Hamp Fault trends circumferential to Hicks Dome, Denny et al. (2010) suggested the fault was related to the domal or circular uplift at Hicks Dome.

References

Bastin, E.S., 1931, The fluorspar deposits of Hardin and Pope Counties, Illinois: Illinois Geological Survey, Bulletin 58, 116 p.

Baxter, J.W., and G.A. Desborough, 1965, Areal geology of the Illinois Fluorspar District: Part 2—Karbers Ridge and Rosiclare Quadrangles: Illinois State Geological Survey, Circular 385, 40 p.

Denny, F.B., B. King, J. Mulvaney-Norris, and D.H. Malone, 2010, Bedrock geology of Karbers Ridge Quadrangle, Hardin, Gallatin, and Saline Counties, Illinois: Illinois State Geological Survey, IGQ Karbers Ridge-BG, 2 sheets, 1:24,000; report, 7 p.

Weller, J.M., R.M. Grogan, and F.E. Tippie, 1952, Geology of the fluorspar deposits of Illinois: Illinois State Geological Survey, Bulletin 76, 147 p.