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 Island, Indonesia
Annotation: Representative samples of rock, alteration, sulphide and vein types compiled by the geology office at Batu Hijau mine
Source: Peter Laznicka
Date: 2000
File size: 72.80 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Volcanics: sample stratigraphy compiled by the geology office at Batu Hijau mine
Source: Peter Laznicka
Date: 2000
File size: 110.01 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Hornblende altered to secondary biotite in drill core
Source: Peter Laznicka
Date: 2000
File size: 80.31 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Massive magnetite alteration zone at outer contact of intermediate tonalite to old tonalite and relicts of andesite: alteration assemblages are lebelled
Source: Peter Laznicka
Date: 2000
File size: 57.23 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Several generations of quartz (± magnetite, Cu sulphides) veinlets on background altered plutonic breccia: detail from geology office display board
Source: Peter Laznicka
Date: 2000
File size: 91.32 Kb
Location:Batu Hijau, Sumbawa Island, Indonesia
Annotation:Multiple overlapping phases of fracturing, alteration, and mineralisation: detail from geology office display board
Source:Peter Laznicka
Date:2000
File size:60.59 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Typical ore: fracture-controlled quartz, chalcopyrite and bornite in altered tonalite
Source: Peter Laznicka
Date: 2000
File size: 76.76 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Intrusion (magmatic) breccia: older phases form partly assimilated inclusions cemented by younger porphyry
Source: Peter Laznicka
Date: 2000
File size: 68.73 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Intrusion (magmatic) breccia: older phases form partly assimilated inclusions cemented by younger porphyry. Tonalite-1 inclusions are mineralised by copper sulphides
Source: Peter Laznicka
Date: 2000
File size: 66.29 Kb

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