Present in Michigan County: Marquette; Geological Formation: ; Specific Mine Name: None; Commercial Mining History: None; Published Literature: Snelgrove, A. K., Seaman, W. A., Ayres, V. L. (1943) 'Strategic Minerals Investigations in Marquette and Baraga Counties', Progress Report No. 10, Geological Survey Division, Michigan Dept. of Conservation, Lansing, MI., p. 60; Unpublished Literature: ; Comments: Snelgrove (1943) says Tetrahedrite was found in the Ropes Gold Mine; USGS Critical Mineral Reference: Seal, R.R., II, Schulz, K.J., and DeYoung, J.H., Jr.,�with contributions from�David M. Sutphin, Lawrence J. Drew, James F. Carlin, Jr., and Byron R. Berger,2017, Antimony, chap. C�of�Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, [...]
