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Name
M.P. Simpson
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Publications

  • Epithermal Au-Ag and related deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand

    Authors
    Stuart F. Simmons, J.L. Mauk, A.B. Christie, M.P. Simpson, R.L. Brathwaite
    Journal
    Economic Geology
    Year
    2007
    Epithermal Au-Ag vein deposits of the Hauraki goldfield in the Coromandel volcanic zone, New Zealand, produced 320,000 kg Au and 1.5 million kg Ag between 1862 and 2006 from a total land area of appro... REGISTER NOW TO SEE MORE

  • The significance of clathrates in fluid inclusions and the evidence for overpressuring in the broadlands-Ohaaki geothermal system, New Zealand

    Authors
    Stuart F. Simmons, M.P. Simpson, T.J. Reynolds
    Journal
    Economic Geology
    Year
    2007
    The Broadlands-Ohaaki geothermal system is host to an epithermal environment where gold-silver transport and deposition involves deeply derived fluids containing up to 3.3 wt percent CO2 and 0.1 wt pe... REGISTER NOW TO SEE MORE

  • Origin of massive calcite veins in the Golden Cross low-sulfidation, epithermal Au-Ag deposit, New Zealand

    Authors
    Stuart F. Simmons, J.L. Mauk, G.B. Arehart, M.P. Simpson
    Journal
    Economic Geology
    Year
    2000
    At Golden Cross, andesitic lavas and volcaniclastic rocks host epithermal veins that formed in the shallow part (<500 m depth) of a hydrothermal system. Calcite is a trace mineral in precious metal-be... REGISTER NOW TO SEE MORE