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Silver Creek, Rico District |
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Colorado, USA |
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Mo
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Silver Creek porphyry molybdenum deposit is located in the Rico District of south-west Colorado, USA, within the Colorado Mineral Belt. With a Pliocene age it is the youngest known porphyry molybdenum deposit in the mineral belt and has associated sulphate replacement, epithermal Pb-Zn-Ag vein and replacement mineralisation and Recent hot spring activity.
The Silver Creek deposit is concealed 1.5 km below surface. One main phase of molybdenum mineralisation appears to have produced a stockwork of molybdenite-quartz-veins with accessory early and late pyrite, orthoclase, fluorite and scheelite. Alteration includes skarn and hydrothermal sulphate (anhydrite) deposits up to 30 m thick formed by replacement of limestone prior to the introduction of molybdenite.
Mineralisation and alteration in the Rico district is related to a 4 Ma Pliocene thermal anomaly which has modified many of the country rocks, both sediments and the abundant intrusives. The youngest and possibly causative intrusives of the district are 4 Ma granitoids.
Historically important Pb-Zn-Ag veins and replacement chimneys and mantos in Carboniferous (Pennsylvanian) carbonates produced 83 847 t Pb, 82 717 t Zn, 5637 t Cu, 450 t Ag, 2.58 t Au.
Drill indicated reserves at the Silver Creek porphyry molybdenum deposit are: 41 Mt @ 0.31% Mo, within a possible resource of up to 185 Mt.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1997.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Wareham C D, Rice C M, Boyce A J, Rogers G 1998 - S, C, Sr, and Pb sources in the Pliocene Silver Creek Porphyry Mo system, Rico, Colorado: in Econ. Geol. v93 pp 32-46
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