Tables of electron probe microanalyses from the Copperwood sediment-hosted stratiform copper deposit, Michigan, USA
Dates
Publication Date
2020-06-30
Start Date
2015-07-01
End Date
2016-06-30
Citation
Mauk, J.L., and Lowers, H.A., 2020, Tables of electron probe microanalyses from the Copperwood sediment-hosted stratiform copper deposit, Michigan, USA: U.S. Geological Survey data release, https://doi.org/10.5066/P9AIB97Y.
Summary
This data release provides electron microprobe analyses of ore minerals from the Copperwood sediment-hosted stratiform copper deposit in the Upper Peninsula of Michigan. The minerals include bornite, chalcocite, native copper, native silver, and pyrite. Minerals were analyzed for Ag, As, Co, Cu, Fe, Hg, Ni, Pb, S, Sb, and Zn. Results with acceptable totals that lie between 98.5 and 101.5% show that these minerals are stoichiometric, with very limited substitution of other elements. The Copperwood copper deposit is a sediment-hosted stratiform copper deposit in the Presque Isle Syncline of the Upper Peninsula of Michigan. The Lower Copper Bearing Sequence has a 2018 mineral resource estimate of 42.2 million metric tons (Mt) of measured [...]
Summary
This data release provides electron microprobe analyses of ore minerals from the Copperwood sediment-hosted stratiform copper deposit in the Upper Peninsula of Michigan. The minerals include bornite, chalcocite, native copper, native silver, and pyrite. Minerals were analyzed for Ag, As, Co, Cu, Fe, Hg, Ni, Pb, S, Sb, and Zn. Results with acceptable totals that lie between 98.5 and 101.5% show that these minerals are stoichiometric, with very limited substitution of other elements. The Copperwood copper deposit is a sediment-hosted stratiform copper deposit in the Presque Isle Syncline of the Upper Peninsula of Michigan. The Lower Copper Bearing Sequence has a 2018 mineral resource estimate of 42.2 million metric tons (Mt) of measured plus indicated mineral resources at an average grade of 1.60% Cu and 3.84 g/t Ag. The measured plus indicated mineral resource in the Upper Copper Bearing Sequence is estimated to be 7.1 Mt at an average grade of 1.21% Cu and 3.26 g/t Ag (Gignac, 2018). The mineral reserves for the Copperwood Project are estimated at 25.4 Mt at an average grade of 1.43% Cu and 3.83 g/t Ag (Gignac, 2018).
Gignac, L. P., 2018, Feasibility Study Copperwood Project Michigan, USA, NI 43-101 technical report prepared for Highland Copper Company Inc [Effective Date June 14, 2018]: G Mining Services Inc., 468 p, accessed September 13, 2019, at https://docs.wixstatic.com/ugd/62921a_41a8193d4db1498e8a2d5b1d1391308f.pdf.
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Mauk Copperwood EPMA Data 2020 0616.xml “Metadata in .xml format” Original FGDC Metadata
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11.71 KB
application/fgdc+xml
Copperwood_DDH_lat_long.csv “Location of drill holes at the Copperwood deposit used in this study”
5.16 KB
text/csv
Copperwood_EPMA_2016_06.csv “Data in .csv format”
158.64 KB
text/csv
Copperwood_EPMA_2015_07.csv “Data in .csv format”
49.15 KB
text/csv
Copperwood EMPA locations.jpg “Location of drill holes at the Copperwood deposit used in this study”
543.15 KB
image/jpeg
Purpose
This dataset is part of an effort to describe the mineralogy and geochemistry of the Copperwood sediment-hosted stratiform copper deposit in the Upper Peninsula of Michigan. Some sediment hosted copper deposits elsewhere contain or produce significant amounts of critical minerals, including cobalt, so one objective of these analyses was to test for minor elements that may occur within the lattice of common ore minerals in the Copperwood deposit.
Preview Image
Location of drill holes at the Copperwood deposit used in this study