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Geco Mine, Manitouwadge, Thunder Bay District, Ontario, Canada

A copper-zinc mine located 200 km East of Thunder Bay near Manitouwadge. Ore is an Archean Cu-Zn massive sulfide deposit. Mine is at least to the 2,850 level.

This volcano-sedimentary deposit has been affected by an amphibolite facies metamorphism (T=650 °C, P=6 kb) resulting in the formation of rocks such as gedrite-cordierite gneisses (cf. Petersen, 1984).

Mineral List

Acanthite
Actinolite
'Albite-Anorthite Series'
'Allanite'
Andradite
Anthophyllite
'Bastnäsite'
'Biotite'
Calcite
Cassiterite
Chalcopyrite
'Chlorite Group'
Cordierite
Corundum
Epidote
Ferro-Actinolite
Ferro-edenite
Ferronigerite-2N1S
Gahnite
Galena
'Garnet'
Gedrite
Hastingsite
Hercynite
'Högbomite'
'Hornblende'
Ilmenite
'K Feldspar'
Magnetite
Microcline
var: Amazonite

'Monazite'
Muscovite
var: Sericite
Phlogopite
Pyrite
Pyrosmalite-(Fe)
Pyrosmalite-(Mn)
Pyrrhotite
Quartz
Rutile
Sillimanite
Sphalerite
Staurolite
Sudoite
Thaumasite
Titanite
Zircon


47 entries listed. 35 valid minerals.

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References

Canadian Mineralogist (1982): 20: 549-553.

Petersen, E.U. (1984), Economic Geology: 81(2): 323-342.

Stevenson, R.K. and Martin, R.F. (1986) Implications of the presence of amazonite in the Broken Hill and Geco metamorphosed sulfide deposits. Canadian Mineralogist: 24: 729-745.

Contributions to Mineralogy and Petrology (1989): 101(3)(March): 350-360.

Franklin, J M, Schnieders, B R, Koopman, E R (1991) Mineral Deposits in the western Superior Province, Ontario (Field Trip 9) Geological Survey of Canada, Open File 2164

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Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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