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Summary: 0361-0128/00/3024/99-14 $6.00 99
Introduction
THE GOLDEN Cross Au-Ag deposit is a classic example of a
volcanic-hosted, low-sulfidation epithermal vein deposit.
From 1989 to 1997, when mining ceased, more than 700,000
oz of gold were produced. Hydrothermal alteration patterns
and fluid inclusion data show that the deposit formed in the
shallow part of a hydrothermal system at less than 500 m
depth, where boiling-upflow conditions existed (de Ronde and
Blattner, 1988; Simpson, C., et al., 1995; Simpson, M., et al.,
1995). Late barren calcite veins are a distinctive feature of the
deposit and are most prominent in the Empire zone, where
ore was mined by underground methods. The abundance of
Origin of Massive Calcite Veins in the Golden Cross Low-Sulfidation,
Epithermal Au-Ag Deposit, New Zealand
STUART F. SIMMONS,
Geothermal Institute and Geology Department, University of Auckland, Private Bag, 92019, Auckland, New Zealand
GREG AREHART,*
Institute of Geological and Nuclear Sciences, Wairakei Research Centre, Private Bag 2000, Taupo, New Zealand
MARK P. SIMPSON,
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