Present in Michigan County: Dickenson; Geological Formation: Groveland Mine Pegmatite; Specific Mine Name: None; Commercial Mining History: None; Published Literature: ; Unpublished Literature: Johnson, Christopher M. and Van Daalen, Christopher M.,2015, Mineralogy and geochemistry of Late Archean and Paleoproterozoic granites and pegmatites in the Northern Penokean terrane of Marquette and Dickinson Counties, Michigan, University of New Orleans Masters Thesis, 384p.; Comments: Mineral grains of Ferrotantalite analysed by Van Vaalen, 2015 averaged 62.6% Ta2O5; USGS Critical Mineral Reference: Schulz, K.J., Piatak, N.M., and Papp, J.F.,2017, Niobium and tantalum, chap. M�of�Schulz, K.J., DeYoung, J.H., Jr., Seal, R.R., II, and Bradley, [...]
