BATU HIJAU COPPER-GOLD DEPOSIT


The Batu Hijau porphyry copper-gold orebody is located at long. 116º49', lat. 9º00'S on the island of Sumbawa in the Sunda-Banda Arc, Indonesia. Mineralisation occurs in the central stock of a tonalite intrusive complex, and in diorite and volcanic wallrocks. The central stock has associated intense pervasive potassic alteration that contains most of the higher grade mineralisation. This merges outwards into an extensive propylitic zone. Both of these zones are over-printed by widespread intermediate-argillic and minor phyllic and albite alteration. Argillic and advanced-argillic assemblages occur near surface. Copper and gold are largely hosted by quartz stockworks, but also as disseminations. Chalcopyrite and bornite are the main ore minerals. Current pit reserves as of December 2002 were 920 mt @ 0.55% Cu, 0.42 g/t Au. The property is owned by Newmont Indonesia Ltd.

Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Schematic representation of the mineral assemblages and characteristics of late hydrothermal alteration zones in andesitic volcanic lithic breccia and equigranular quartz diorite in the Batu Hijau diapir
Source: Courtesy of Steven Garwin, PhD thesis 'The Setting, Geometry & Timing of Intrusion-related Hydrothermal Systems in the Vicinity of the Batu Hijau Cu-Au Deposit ....'
Date: August 2000
File size: 47.72 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Ternary geochemical plot of representative samples of early- and late-hydrothermal alteration styles in the Batu Hijau district, and compositions for common alteration minerals in porphyry systems
Source: Courtesy of Steven Garwin, PhD thesis 'The Setting, Geometry & Timing of Intrusion-related Hydrothermal Systems in the Vicinity of the Batu Hijau Cu-Au Deposit ....'
Date: August 2000
File size: 63.80 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Photomicrographs of hydrothermal sericite and paragonite replacement of magmatic minerals in rocks of the Batu Hijau district
Source: Courtesy of Steven Garwin, PhD thesis 'The Setting, Geometry & Timing of Intrusion-related Hydrothermal Systems in the Vicinity of the Batu Hijau Cu-Au Deposit ....'
Date: August 2000
File size: 72.71 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Photomicrographs of hydrothermal minerals in advanced argillic-altered rocks of the Batu Hijau district
Source: Courtesy of Steven Garwin, PhD thesis 'The Setting, Geometry & Timing of Intrusion-related Hydrothermal Systems in the Vicinity of the Batu Hijau Cu-Au Deposit ....'
Date: August 2000
File size: 81.95 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Photographs of quartz veins in the Bambu vein system
Source: Courtesy of Steven Garwin, PhD thesis 'The Setting, Geometry & Timing of Intrusion-related Hydrothermal Systems in the Vicinity of the Batu Hijau Cu-Au Deposit ....'
Date: August 2000
File size: 74.54 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Photographs of quartz veins in the Bambu vein system
Source: Courtesy of Steven Garwin, PhD thesis 'The Setting, Geometry & Timing of Intrusion-related Hydrothermal Systems in the Vicinity of the Batu Hijau Cu-Au Deposit ....'
Date: August 2000
File size: 69.58 Kb

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