Back Forty Deposit, Menominee Co., Michigan, USAi
| Regional Level Types | |
|---|---|
| Back Forty Deposit | Deposit |
| Menominee Co. | County |
| Michigan | State |
| USA | Country |
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Latitude & Longitude (WGS84):
45° 27' 9'' North , 87° 49' 50'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Wausaukee | 568 (2017) | 13.1km |
| Amberg | 180 (2017) | 13.9km |
| Daggett | 254 (2017) | 17.5km |
| Stephenson | 867 (2017) | 17.9km |
| Middle Inlet | 827 (2017) | 21.9km |
The Back Forty Project is an advanced stage exploration program focusing on a newly discovered polymetallic zinc-copper, bimodal felsic type VMS deposit located in Menominee County, Michigan.
Early in 2002, drill testing of a geophysical anomaly resulted in the discovery of the massive sulfide deposit. Subsequent drilling in 2002-03 and 2006-08 totaling over 77,000 meters has defined numerous closely spaced zones of significant zinc-gold-copper-silver mineralization comprising the Back Forty Deposit.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
27 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Acanthite Formula: Ag2S Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ 'Amphibole Supergroup' Formula: AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Arsenopyrite Formula: FeAsS Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Baryte Formula: BaSO4 Reference: DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ 'Biotite' Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Bornite Formula: Cu5FeS4 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Cassiterite Formula: SnO2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Chalcopyrite Formula: CuFeS2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ 'Chlorite Group' Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Clausthalite Formula: PbSe Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Diaphorite Formula: Ag3Pb2Sb3S8 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Dolomite Formula: CaMg(CO3)2 Reference: DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Eugenite Formula: Ag11Hg2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Galena Formula: PbS Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Goethite Formula: α-Fe3+O(OH) Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Gold Formula: Au Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
|
| ⓘ Gold var. Electrum Formula: (Au,Ag) Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Hematite Formula: Fe2O3 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Luanheite Formula: Ag3Hg Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Marcasite Formula: FeS2 Reference: DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Meneghinite Formula: Pb13CuSb7S24 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Muscovite var. Sericite Formula: KAl2(AlSi3O10)(OH)2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Nickelskutterudite Formula: (Ni,Co,Fe)As3 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Pyrite Formula: FeS2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Pyrrhotite Formula: Fe1-xS Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Quartz Formula: SiO2 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85. |
| ⓘ Ramdohrite Formula: Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Silver Formula: Ag Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
|
| ⓘ Skutterudite Formula: CoAs3 Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ Sphalerite Formula: ZnS Reference: Quigley, Tom, and Mahin, Bob, 2008, Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ 'Tennantite Subgroup' Formula: Cu6(Cu4C2+2)As4S12S Reference: DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S Reference: DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237. |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Eugenite | 1.AD.15c | Ag11Hg2 |
| ⓘ | Gold | 1.AA.05 | Au |
| ⓘ | var. Electrum | 1.AA.05 | (Au,Ag) |
| ⓘ | Luanheite | 1.AD.15b | Ag3Hg |
| ⓘ | Silver | 1.AA.05 | Ag |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Acanthite | 2.BA.35 | Ag2S |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Clausthalite | 2.CD.10 | PbSe |
| ⓘ | Diaphorite | 2.JB.05 | Ag3Pb2Sb3S8 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Marcasite | 2.EB.10a | FeS2 |
| ⓘ | Meneghinite | 2.HB.05b | Pb13CuSb7S24 |
| ⓘ | Nickelskutterudite | 2.EC.05 | (Ni,Co,Fe)As3 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Ramdohrite | 2.JB.40a | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| ⓘ | Skutterudite | 2.EC.05 | CoAs3 |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | 'Tennantite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)As4S12S |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Cassiterite | 4.DB.05 | SnO2 |
| ⓘ | Goethite | 4.00. | α-Fe3+O(OH) |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| Group 9 - Silicates | |||
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | var. Sericite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| Unclassified Minerals, Rocks, etc. | |||
| ⓘ | 'Amphibole Supergroup' | - | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| ⓘ | 'Biotite' | - | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| ⓘ | 'Chlorite Group' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| H | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| H | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Goethite | α-Fe3+O(OH) |
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| C | Carbon | |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| O | Oxygen | |
| O | ⓘ Hematite | Fe2O3 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| O | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| O | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Goethite | α-Fe3+O(OH) |
| O | ⓘ Cassiterite | SnO2 |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| F | Fluorine | |
| F | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| F | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Mg | Magnesium | |
| Mg | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Al | Aluminium | |
| Al | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Al | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Al | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Si | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Si | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Galena | PbS |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Pyrrhotite | Fe1-xS |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Acanthite | Ag2S |
| S | ⓘ Diaphorite | Ag3Pb2Sb3S8 |
| S | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| S | ⓘ Meneghinite | Pb13CuSb7S24 |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Marcasite | FeS2 |
| S | ⓘ Tennantite Subgroup | Cu6(Cu4C22+)As4S12S |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Cl | Chlorine | |
| Cl | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| K | Potassium | |
| K | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| K | ⓘ Muscovite var. Sericite | KAl2(AlSi3O10)(OH)2 |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Ti | Titanium | |
| Ti | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Ti | ⓘ Amphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
| Mn | Manganese | |
| Mn | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Fe | Iron | |
| Fe | ⓘ Nickelskutterudite | (Ni,Co,Fe)As3 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Hematite | Fe2O3 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Fe | ⓘ Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
| Fe | ⓘ Goethite | α-Fe3+O(OH) |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Fe | ⓘ Marcasite | FeS2 |
| Co | Cobalt | |
| Co | ⓘ Nickelskutterudite | (Ni,Co,Fe)As3 |
| Co | ⓘ Skutterudite | CoAs3 |
| Ni | Nickel | |
| Ni | ⓘ Nickelskutterudite | (Ni,Co,Fe)As3 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Meneghinite | Pb13CuSb7S24 |
| Cu | ⓘ Tennantite Subgroup | Cu6(Cu4C22+)As4S12S |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Nickelskutterudite | (Ni,Co,Fe)As3 |
| As | ⓘ Arsenopyrite | FeAsS |
| As | ⓘ Skutterudite | CoAs3 |
| As | ⓘ Tennantite Subgroup | Cu6(Cu4C22+)As4S12S |
| Se | Selenium | |
| Se | ⓘ Clausthalite | PbSe |
| Ag | Silver | |
| Ag | ⓘ Silver | Ag |
| Ag | ⓘ Gold var. Electrum | (Au,Ag) |
| Ag | ⓘ Acanthite | Ag2S |
| Ag | ⓘ Diaphorite | Ag3Pb2Sb3S8 |
| Ag | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Ag | ⓘ Eugenite | Ag11Hg2 |
| Ag | ⓘ Luanheite | Ag3Hg |
| Cd | Cadmium | |
| Cd | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| In | Indium | |
| In | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Sn | Tin | |
| Sn | ⓘ Cassiterite | SnO2 |
| Sb | Antimony | |
| Sb | ⓘ Diaphorite | Ag3Pb2Sb3S8 |
| Sb | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Sb | ⓘ Meneghinite | Pb13CuSb7S24 |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
| Au | ⓘ Gold var. Electrum | (Au,Ag) |
| Hg | Mercury | |
| Hg | ⓘ Eugenite | Ag11Hg2 |
| Hg | ⓘ Luanheite | Ag3Hg |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
| Pb | ⓘ Diaphorite | Ag3Pb2Sb3S8 |
| Pb | ⓘ Ramdohrite | Pb5.9Fe0.1Mn0.1In0.1Cd0.2Ag2.8Sb10.8S24 |
| Pb | ⓘ Clausthalite | PbSe |
| Pb | ⓘ Meneghinite | Pb13CuSb7S24 |
References
Sort by
Year (asc) Year (desc) Author (A-Z) Author (Z-A)Dematties, T. A. (2007) An evaluation of the Back Forty volcanogenic massive sulfide (VMS) deposit, Menominee County, Michigan, U.S.A.: Technical report prepared for Aquila Resources Inc., 52p.
Quigley, Tom, and Mahin, Bob. (2008) Back Forty Geology and Mineralization: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 2 - Field Trip Guidebook, 66-85.
Schultz, K.J., Nicholson, S.W., and Van Schmus, W.R. (2008) Penokean massive sulfide deposits: Age, geochemistry, and paleotectonic setting: Proceedings of the Institute on Lake Superior Geology, v. 54, Part 1-Programs and Abstracts, 76-77.
Sims, P.K., Van Schmus, W.R., Schultz, K.J., and Peterman, Z.E. (1989) Tectono-stratigraphic evolution of the early Proterozoic Wisconsin magmatic terranes of the Penokean orogen: Canadian Journal of Earth Sciences, v.26, p.2, 145-2, 158.
DeMatties, T. A. (2018). Effects of paleoweathering and supergene activity on volcanogenic massive sulfide (VMS) mineralization in the Penokean Volcanic Belt, northern Wisconsin, Michigan and east-central Minnesota, USA: Implications for future exploration. Ore Geology Reviews, 95, 216-237.
External Links
http://www.aquilaresources.com/summary.html
http://mgmudrey.brinkster.net/ILSG/ILSG_54_2008_pt1_Marquette.pdf
http://mgmudrey.brinkster.net/ILSG/ILSG_54_2008_pt2_Marquette.pdf
http://mgmudrey.brinkster.net/ILSG/ILSG_54_2008_pt1_Marquette.pdf
http://mgmudrey.brinkster.net/ILSG/ILSG_54_2008_pt2_Marquette.pdf
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Michigan BasinBasin
- Minnesota River DomainDomain
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