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 cross-section for the Batu Hijau area, showing sulphide- and oxide-mineral zones reconstructed to a mid-Pliocene palaeosurface on the basis of assumptions given in the thesis text
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: 40.75 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Simplified metal zoning patterns of the Batu Hijau area, showing central Cu (chalcocite, bornite & chalcopyrite) & Au (native gold), proximal Mo (molybdenite), & peripheral Zn (sphalerite) anomalies in bedrock & soil. Gold occurs in copper-sulphides in the deposit core & within structurally-controlled pyritic "D" veins & quartz veins that extend through the deposit. Arsenic (tennantite) in these late veins forms linear anomalies outboard of gold.
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: 50.37 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Schematic cross-section for the Batu Hijau area, showing metal zones reconstructed to a mid-Pliocene palaeosurface, on the basis of assumptions given in the thesis text
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: 41.23 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Simplified geophysical characteristic of the Batu Hijau area, showing the outlines of magnetite, radiometric and induced polarisation-chargeability anomalies. Batu Hijau is characterised by coincident magnetic and chargeability highs that lie within a corridor of anomalous radiometric potassium.
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: 48.33 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Schematic vertical sections of intrusive relationships and zonal patterns as a function of depth in the Batu Hijau deposit area, reconstructed to a mif-Pliocene palaeosurface
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: 110.06 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Synoptic plots illustrating the inferred geological- hydrothermal alteration-, mineralisation- and metal zoning-patterns and geophysical responses for the Batu Hijau deposit at three crustal-levels: the mid-Pliocene palaeosurface, and depths of 1 km and 2.5 km
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: 60.60 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Cross-section of mine geology with projected pit profiles
Source: Courtesy Newmont Mining Corporation
Date: 2003
File size: 34.00 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: 3D view of mineralisation at depth beneath pit
Source: Courtesy Newmont Mining Corporation
Date: 2003
File size: 18.35 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Soil geochemistry: gold ppb. Gold and copper distribution in soil is highly anomalous over Bat Hijau. A >100 ppb Au anomaly is coincident with tonalite outcrop and altered wall rocks. A >600 ppm copper anomaly is also coincident with the deposit outcrop and leached secondary copper occurs in drainage to the north. Molybdenum forms a broad halo around the deposit.
Source: Australian Mineral Foundation: Maula & Levet, in proceedings oPorphyry Related Copper & Gold Deposits of the Asia Pacific Region
Date: 1996
File size: 37.91 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Soil geochemistry: copper ppm. Gold and copper distribution in soil is highly anomalous over Bat Hijau. A >100 ppb Au anomaly is coincident with tonalite outcrop and altered wall rocks. A >600 ppm copper anomaly is also coincident with the deposit outcrop and leached secondary copper occurs in drainage to the north. Molybdenum forms a broad halo around the deposit.
Source: Australian Mineral Foundation: Maula & Levet, in proceedings oPorphyry Related Copper & Gold Deposits of the Asia Pacific Region
Date: 1996
File size: 38.10 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: Ground magnetics: total field data reduced to the pole. A circular magnetic high centred over the deposit correlates well with surface projection of the 0.5% Cu contour of the deposit. Secondary magnetite, associated with the potassic alteration of the intrusives and the propylitic alteration of the wall rocks, produces a distinctive high in aeromagnetic and ground magnetic data.
Source: Australian Mineral Foundation: Maula & Levet, in proceedings oPorphyry Related Copper & Gold Deposits of the Asia Pacific Region
Date: 1996
File size: 41.36 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: IP gradient array: chargeability. This clearly defines the gross mineral system and outlines economic mineralisation. The 60 ms chargeability contour maps the surface projection of 0.5% Cu from the 300 m level. Also, a well-defined chargeability annulus 600 m from the centre of the deposit and 200 m in width encircles the core anomaly, believed to represent the higher pyritic outer alteration halo.
Source: Australian Mineral Foundation: Maula & Levet, in proceedings oPorphyry Related Copper & Gold Deposits of the Asia Pacific Region
Date: 1996
File size: 36.08 Kb
Location: Batu Hijau, Sumbawa Island, Indonesia
Annotation: IP gradient array: resistivity. Well defined conductive zones correlate with the argillic alteration zone. Interpretation of the dipole-dipole data also clearly outlines the mineralised core and the argillic alteration zone.
Source: Australian Mineral Foundation: Maula & Levet, in proceedings oPorphyry Related Copper & Gold Deposits of the Asia Pacific Region
Date: 1996
File size: 37.53 Kb

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