Commodities
PrimaryCopper, Nickel
TertiaryPalladium, Cobalt, Platinum
Commodity typeM
Deposit
Model9: Duluth Cu-Ni-PGE
Deposit sizeN
Orebody formTABULAR, DISSEMINATED
Ore controlSulfides Segregated In Basal Troctolites Sub-Parallel To Lower Contacts. Faults And Folds Were Responsible For Localizing Sulfide Mineralization As Well As For Providing Conduits For Later Syn- To Post-Magmatic Hydrothermal Fluids.
Materials
Ore mineralsBornite, Chalcopyrite, Cubanite, Millerite, Pentlandite, Pyrrhotite, Sphalerite
GangueOlivine, Plagioclase, Pyroxene
Geology
Host rockTroctolite · South Kawishiwi Intrusion
Associated rockIron Formation · Biwabik Formation
StructureSeveral Ne-Trending Normal Faults Parallel The Midcontinent Rift System Near The Margin. These Faults Formed During The Opening Of The Rift And Controlled Emplacement Of The Troctolitic And Late Intrusions.
Economic & production
Development statusOccurrence
Identification
Deposit ID10048523
MRDS IDMP00113
RegionNA
Data scoreB
Coordinates47.72083, -91.82434
References
CANNON, W.F., 1991, WRITTEN COMMUN. TO M.L. ZINETEKMORTON, PENELOPE, AND HAUCK, S.A., 1987, PGE, AU AND AG CONTENTS OF CU-NI SULFIDES FOUND AT THE BASE OF THE DULUTH COMPLEX, NORTHEASTERN MINNESOTA: NATURAL RESOURCES RESEARCH INSTITUTE TECHNICAL REPORT NRRI/GMIN-TR-87-04, 81 P.