Precious- and base-metal mineralogy of the Hellyer volcanogenic massive sulphide deposit, northwest Tasmania — a study by electron microprobe

Ramsden, A. R.; Kinealy, K.; Creelman, Robert A.; French, David

doi:10.1007/978-94-009-0809-3_4

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…deposit in eastern Australia (up to 720 ppm Au in arsenopyrite, with an average of 250 ppm) and the nearby Rosebery deposit (up to 3000 ppm Au in arsenopyrite, with an average of 260 ppm: Huston et al 1992). At Hellyer, gold-bearing arsenopyrite accounts for as much as 90% of the bulk gold content of the deposit (Ramsden et al 1990), and visible electrum and arsenopyrite account for virtually all of the gold at Rosebery (Huston et al 1992). Healy and Petruk (1990) also found similar concentrations of gold, averaging close to 30 ppm Au, in arsenopyrite from the Trout Lake deposit, Manitoba.…”

Section: Discussionmentioning

confidence: 98%

Characteristics of gold mineralization in volcanogenic massive sulphide deposits of the Notre Dame Bay area, central Newfoundland

Santagulda¹,

Hannington²

1996

Can. J. Earth Sci.

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A reconnaissance study of 19 volcanogenic massive sulphide deposits in the Notre Dame Bay area indicates Au concentrations of up to 30 pprn (Betts Cove), and elevated gold contents (> 1 pprn Au) have been found in samples from 10 additional past producers and developed prospects. Systematic trends in the occurrence of gold are observed in two principal sulphide assemblages: polymetallic, pyrite -sphalerite -chalcopyrite -galena f arsenopy rite assemblages (type I) and pyrite-chalcopyrite + sphalerite f pyrrhotite assemblages (type 11). Type I assemblages occur in deposits with dominantly felsic host rocks, whereas type I1 assemblages are restricted to deposits in mafic-dominated ophiolite sequences. Free gold grains were observed in samples from eight different deposits in both type I and type I1 assemblages. X-ray emission spectra and electron microprobe analyses of the gold indicate that most grains are electrum, although a Au-bearing telluride occurs at Point Leamington. Ion microprobe analyses indicate that as much as 50% of bulk gold may be present as "invisible gold" locked in pyrite or arsenopyrite (up to 140 pprn Au at Point Leamington). Well-preserved primary depositional features in gold-bearing sulphides from several deposits suggest that the gold in type I assemblages is syngenetic. A strong correlation between gold and a polymetallic suite of Zn, Ag, Pb, As, and Sb, similar to that observed in Kuroko-type massive sulphides and in modem seafloor sulphides, supports a primary origin for gold in type I assemblages. In type I1 assemblages primary depositional features have been largely destroyed by deformation and annealing of sulphide grains. Gold is locally enriched in Zn-rich sulphides, and sulphides containing abundant pyrrhotite have the lowest gold contents. However, consistent geochemical associations with other elements are not observed, and this may reflect the strong remobilization of gold during structural deformation. The abundant free gold in some type I1 assemblages is a product of recrystallization during deformation and was derived locally from primary gold originally present in the host sulphides.

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Section: Discussionmentioning

confidence: 98%

Characteristics of gold mineralization in volcanogenic massive sulphide deposits of the Notre Dame Bay area, central Newfoundland

Santagulda¹,

Hannington²

1996

Can. J. Earth Sci.

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“…Strictly speaking, sec- tions 10730N and 10860N are most closely paired after unfolding the Jack Fault. Samples from drill hole 38A on section 10450N were polished sections previously studied by Ramsden et al (1990) and were used to test vertical variation. For the footwall, ablation analyses were carried out on some samples previously used for conventional analyses by Gemmell and Large (1992), together with additional vein samples, and also on samples obtained from several drill holes that penetrated the ''unaltered'' footwall volcanic rocks outside the stringer envelope zone (Figs.…”

Section: Sampling and Analytical Methodsmentioning

confidence: 99%

Nature and origin of the fluids responsible for forming the Hellyer Zn–Pb–Cu, volcanic-hosted massive sulphide deposit, Tasmania, using fluid inclusions, and stable and radiogenic isotopes

Solomon

Gemmell

Zaw

2004

Ore Geology Reviews

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Gold and silver extraction from Hellyer lead-zinc flotation middlings using pressure oxidation and thiourea leaching

1993

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Precious- and base-metal mineralogy of the Hellyer volcanogenic massive sulphide deposit, northwest Tasmania — a study by electron microprobe

Cited by 6 publications

References 13 publications

Characteristics of gold mineralization in volcanogenic massive sulphide deposits of the Notre Dame Bay area, central Newfoundland

Characteristics of gold mineralization in volcanogenic massive sulphide deposits of the Notre Dame Bay area, central Newfoundland

Nature and origin of the fluids responsible for forming the Hellyer Zn–Pb–Cu, volcanic-hosted massive sulphide deposit, Tasmania, using fluid inclusions, and stable and radiogenic isotopes

Gold and silver extraction from Hellyer lead-zinc flotation middlings using pressure oxidation and thiourea leaching

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