northwest Giant Placers of the Victorian Gold Province
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold in Victoria  |  Topic: Giant Placers of the Victorian Gold Province 0 Members and 1 Guest are viewing this topic. « previous next »
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« on: Sunday February 10 2019 12:36:39 AEDT PM »

Giant Placers of the Victorian Gold Province
Martin J. Hughes (SEG 1993),† CSIRO Exploration and Mining, Dept. of Earth Sciences, Monash University,
c/- PO Box 148N Ballarat North, Victoria, Australia 3350
G. Neil Phillips (SEG 1985 F), CSIRO Exploration and Mining, c/o PO Box 3, Central Park, Victoria, Australia 3145
Stephen P. Carey, University of Ballarat, PO Box 663, Ballarat, Victoria, Australia 3353
ABSTRACT
The Victorian gold province has yielded 2500 tonnes (t) Au, nearly 2 percent of cumulative world gold production, mostly mined between 1851 and 1910. Fifty-five percent (1375 t) was placer gold from modern and paleostream systems, and from eluvial deposits, and the remainder came from primary quartz vein-related deposits. Most of the alluvial gold placers are in unconsolidated or weakly cemented quartz pebble conglomerate and gravel, dominated by hydrothermal quartz, although a few paleoplacers are within duricrusted conglomerate that required crushing. Large and abundant gold nuggets were common.
Placer gold deposits formed in three intervals following uplift in the Late Cretaceous, Late Eocene, and Pliocene. An important factor in the preservation of the paleoplacers has been their burial by younger sediments and basalt flows, with consequent protection from erosion and dispersal. Factors in the formation of the giant gold placers of Victoria include the following: (1) the existence of a major primary gold province with several multimillion-ounce gold deposits; (2) uplift and reactivation of older faults; and (3) high rainfall and deep Paleogene weathering.
  
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australian electronic gold prospecting forum.com  |  Geology and occurrence of gold deposits  |  Gold deposits  |  Gold in Victoria  |  Topic: Giant Placers of the Victorian Gold Province « previous next »
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