Nickel, Copper and Platinum Group Elements-Selected References Bornhorst, T.J., and Baxter, D.A., 1990, Reconnaissance Evaluation of Platinum -Group Elements in Selected Precambrian Rocks of the, Western Upper Peninsula; Michigan Department of Geological Engineering, Geology and Geophysics, Michigan Technological University, Houghton, Michigan, Michigan Department of Environmental Quality Geological and Land Management Division Contribution to Michigan Geology Report - 90-2 http://www.michigan.gov/documents/deq/CMG_90_02_Platinum_2_301732_7.pdf Ding, X, Edward M.R. & Chusi Li, 2011, PGE geochemistry of the Eagle Ni–Cu–(PGE) deposit,Upper Michigan: constraints on ore genesis in a dynamic magma conduit; Miner Deposita, DOI 10.1007/s00126-011-0350-y http://www.geo.mtu.edu/~raman/papers2/DingetalEagleGeochemMD2011.pdf Ding X, Li C, Ripley EM, Rossell D, Kamo SL (2010) The Eagle and East Eagle sulfide ore-bearing mafic–ultramafic intrusions in the midcontinent rift system, upper Michigan: geochronology and petrologic evolution. Geochemistry, Geophysics Geosystems, Vol, 11, issue 3, 11:Q03003. doi:10.1029/2009GC002546 Ding X, Ripley EM, Shirey SB, Li C, Moore CH (2011) Os, Nd, O and S isotope constraints on the importance of country rock contamination in the generation of the conduit-related Eagle Cu–Ni–(PGE) deposit in the Midcontinent Rift System, Upper Michigan. Geochim Cosmochim Acta (in press) Daniel J.F., 2011, Petrology and Cu-Ni-PGE Mineralization of the Bovine Igneous Complex, Baraga County, Northern Michigan, University of Minnesota unpublished MS Thesis, 109 p. http://www.d.umn.edu/geology/research/thesis/Foley_Daniel_July2011.pdf J. S. Klasner, 1979; Report of Investigation 24: The Yellow Dog Peridotite and A Possible Buried Igneous Complex of Lower Keweenawan Age in the Northern Peninsula of Michigan; A detailed study a possibly economic geologic complex; maps, illustrated Marquette Co. http://www.michigan.gov/documents/deq/GIMDL-RI24_307817_7.pdf Rossell D, Coombes S, 2005, The geology of the Eagle nickel–copper deposit Michigan, USA: Kennecott Exploration report to Kennecott Minerals Company: 34 pp Klaus Schulz, K, 2011, Sulfide Deposits and Associated Geology in Michigan and Wisconsin, Understanding the Impacts of Mining in the Western Lake Superior region (Minnesota, Wisconsin, and Michigan), Session: Mineral Deposits, Associated Geology, and Mineral Economics Conference, Bad River Lodge, Casino, and Convention Center, Odanah, Wisconsin, September 12-14, 2011 http://mn.water.usgs.gov/projects/tesnar/2011/Presentations/SchulzSulfide%20deposits% 20of%20Michigan%20and%20Wisconsin.pdf Assessment of the platinum-group element resources in mafic-ultramafic igneous intrusions of the Midcontinent Rift System, Lake Superior region, U.S. Geological Survey http://geomaps.wr.usgs.gov/midcontpge/index.htm .