Minnesota · Lake County
Prospect

Spruce Road deposit

Lake County, Minnesota, United States
CopperNickelPlatinumPalladiumCobaltGoldSilverPGE
⌖ Show on mapUSGS source ↗
Description

International Nickel Company

Commodities
PrimaryCopper, Nickel, Platinum, Palladium
SecondaryCobalt, Gold, Silver
TertiaryPGE
Commodity typeM
Deposit
Model9: Duluth Cu-Ni-PGE
Deposit sizeU
WorkingsSurface
Orebody formTABULAR - LENS
Ore controlFaults 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, Bravoite, Chalcocite, Copper, Cuprite, Digenite, Galena, Magnetite, Pentlandite, Pyrite, Sphalerite, Tenorite, Troilite
GangueOlivine, Plagioclase, Pyroxene
Other materialsPyrrhotite
Geology
Host rockMafic Intrusive Rock,Troctolite · "Duluth Complex", "South Kawishiwi Intrusion"
Associated rockGranite,Iron Formation,Argillite · "Giants Range Batholith", "Biwabik Formation", "Virginia 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 statusProspect
Discovery year1955
Identification
Deposit ID10038935
MRDS IDM046425
Alternate namesSpruce Open Pit Inco, Spruce Mine, Inco Prospect, Ely Spruce, Ely Nickel Copper
RegionNA
Data scoreA
Coordinates47.82972, -91.681
References
BOUCHER, M. L., 1975, COPPER - NICKEL MINERALIZATION IN DRILL CORE. U.S.BUREAU OF MINES REPORT OF INVESTIGATION 8084, 55 P.BONNICHSEN, BILL., 1974, COPPER AND NICKEL RESOURCES IN THE DULUTH COMPLEX; MINNESOTA GEOLOGICAL SURVEY I.C.10.CORNWALL, H.R., 1966, NICKEL DEPOSITS OF NORTH AMERICA, U.SS. GEOLOGICAL SURVEY BULLETIN 1223, P. 43-44.SCHWARTZ, G.M., AND DAVIDSON, D.M., 1952, MINING ENG., VOL. 4, NO. 7, P. 699-702.CORNWALL, H.R., 1973, NICKEL (CHAPTER IN): U.S.GEOLOGICAL SURVEY PROFESSIONAL PAPER 820, P.440.BONNICHSEN AND TYSON, 1975, FIELD GUIDEBOOK FOR THE ELY HOYT LAKES REGION OF THE DULUTH COMPLEX, MINNESOTA, PENROSE CONFERENCE, SEPT. 1975PAGE, N. J, 1986, DESCRIPTIVE MODEL OF DULUTH CU-NI-PGE, IN COX, D.P. AND SINGER, D.A., MINERAL DEPOSIT MODELS: U.S. GEOLOGICAL SURVEY BULLETIN 1693, P. 16HAUCK, S.A., SEVERSON, M.J., ZANKO, L., BARNES, S-J., MORTON, P., ALMINAS, H., FOORD, E.E., AND DAHLBERG, E.H., 1997, AN OVERVIEW OF THE GEOLOGY AND OXIDE, SULFIDE AND PLATINUM-GROUP ELEMENT MINERALIZATION ALONG THE WESTERN AND NORTHERN CONTACTS OF THE DULUTH COMPLEX: GEOLOGICAL SOCIETY OF AMERICA SPECIAL PAPER, V. 312, PP. 137-185.FOOSE, M.P., 1985, THE SETTING AND DISTRIBUTION OF COPPER-NICKEL SULFIDES IN THE SOUTH KAWISHIWI INTRUSION, DULUTH COMPLEX, MINNESTOA, IN KRAFT, KATHLEEN, ED., U.S. GEOLOGICAL SURVEY RESEARCH ON MINERAL RESOURCES--1985, PROGRAM AND ABSTRACTS: U.S. GEOLOGICAL SURVEY CIRCULAR 949, P. 12-13.MANIFILE, THE UNIVERSITY OF MANITOBA FILE OF NONFERROUS METAL DEPOSITS OF THE WORLD, 1973, UNIVERSITY OF MANITOBA,WINNIPEG, MANITOBA, INDEX NO. A17202002.METAL WEEK-METALS SOURCEBOOK, 3/11/74, ITEM #B1834.SKINNER, WALTER R., 1973, MINING INTERNATIONAL YEARBOOK: THE FINANCIAL TIMES, LONDON, 1973, P.316.INTERNATIONAL NICKEL COMPANY OF CANADA, 1972 ANNUAL REPORT.