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Conference Proceedings

PACRIM 2015

Conference Proceedings

PACRIM 2015

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The Composition of Disseminated, Gold-bearing Sulfides within the Three-dimensional Framework of Bulk Au, As and Sb in the Globe-Progress Orogenic Gold Deposit, Reefton Goldfield, New Zealand

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Disseminated, gold-bearing sulfide minerals hosted in sheared, wall rock metasediments and clay alteration zones comprise one of the dominant styles of Palaeozoic orogenic gold mineralisation within the Reefton Goldfield, and is exemplified by OceanaGold's Globe Mine. This study begins the exploration and characterisation of the gold-arsenic-antimony mineralisation hosted within the dominant lithologies of the Globe-Progress shear zone. The main gold-bearing sulfides are pyrite, arsenopyrite and stibnite. Pyrite and arsenopyrite are not compositionally uniform across the Globe-Progress shear zone. Pyrite from the mineralised greywacke and argillite has higher As contents than pyrite in the host rock and pug breccia. Furthermore, the mineralised greywacke and argillite pyrite are enriched in As from core to rim. The 3D models based on bulk assays reveal a significant correlation in the distribution of Au, As and Sb. The interpolant for Sb envelops those for Au and As, which in turn are very similar to each other in their vertical and lateral extents across the shear zone. This result is consistent with earlier findings that the occurrence of stibnite represents a separate and likely later phase of mineralisation relative to that represented by the formation of disseminated pyrite and arsenopyrite both of which exert a stronger control on the distribution of As.CITATION:Durance, P M J, Christie, A B, McIntosh, C and Carder, M, 2015. The composition of disseminated, gold-bearing sulfides within the three-dimensional framework of bulk Au, As and Sb in the Globe-Progress orogenic gold deposit, Reefton Goldfield, New Zealand, in Proceedings PACRIM 2015 Congress, pp 327-334 (The Australasian Institute of Mining and Metallurgy: Melbourne).
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  • The Composition of Disseminated, Gold-bearing Sulfides within the Three-dimensional Framework of Bulk Au, As and Sb in the Globe-Progress Orogenic Gold Deposit, Reefton Goldfield, New Zealand
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  • The Composition of Disseminated, Gold-bearing Sulfides within the Three-dimensional Framework of Bulk Au, As and Sb in the Globe-Progress Orogenic Gold Deposit, Reefton Goldfield, New Zealand
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  • Published: 2015
  • PDF Size: 1.363 Mb.
  • Unique ID: P201502044

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