Silver-lead-zinc deposit. The mine started production in 1997.
Synchronous deformation and metamorphism at the Cannington Ag–Pb–Zn deposit, in northeastern Australia, involved a phase of Ca and Mn mobilization that accounts for the distribution of pyroxene- and garnet-bearing rocks, which were preferentially overprinted by sulfide mineralization. Garnet composition and its textural association in relation to three generations of planar fabric (S1 to S3) show that skarn-related grossular-rich garnet formed in the last garnet-stable event, D3. The D3 Cl-rich biotite in the gneiss is intergrown with garnet in veins, and within skarn rocks is continuous along strike with veins of garnet ± pyroxmangite, hedenbergite or amphibole, which indicates a period of anhydrous through to hydrous metasomatism. Compositional maps show that infiltration extended from alteration fronts through fractures, which indicates the high permeability of S3; these maps and XGrt profiles across skarn–gneiss contacts show that there was large-scale transport of mass by infiltration and varying degrees of hydrodynamic dispersion. Precipitation of oscillatory Ca- and Mn-zoned grossular-rich garnet in veins parallel to veins filled with Cl-rich biotite, in conjunction with the distribution of biotite-filled veins across the deposit, suggest that the mass transfer during D3 may be responsible for deposit-scale Ca–Mn skarn-like zoning.
References:
- T.J. Roache, P.J. Williams, J.M. Richmond, and L.H. Chapman (2005): Vein and skarn formation at the Cannington Ag-Pb-Zn deposit, northeastern Australia. Can. Mineral. 43, 241-262.
- www.aig.asn.au/roache_a.htm
- www.geodiscovery.com.au/download/Cannington%20Abstract.pdf
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Map Reference: 21°55'S , 140°54'E
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Mineral List:15 entries listed. 11 valid minerals.
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