Kucing Liar, Big Gossan, Ertsberg/Ertzberg

Irian Jaya, West Papua, Indonesia

Main commodities: Cu Au
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In addition to the Grasberg porphyry deposit, high grade gold-copper ore is found in sediment hosted skarns fringing both the Grasberg Igneous Complex and the adjacent, marginally older Ertsberg Diorite 2 km to the south-east.

These skarns include the Kucing Liar deposit adjacent to the Grasberg Igneous Complex, the DOM, IOZ and DOZ, GBT of the East Ertsberg Skarn System and the Ertsberg skarn, all fringing the Ertsberg Diorite, and the Big Gossan orebody west of the latter.

With the exception of the original Ertsberg Skarn of 32 Mt @ 0.46 g/t Au, 2.2% Cu, all are underground mining operations.

In the Ertsberg Mining District, the intruded sequence comprises a lower, 2000 m thick Jurassic to Cretaceous sequence of sandstones, shales and limestones. These are overlain by 1600 m of Miocene age limestones and dolomites of the New Guinea Limestone Group, commencing with the 290 m thick Paleocene Waripi Formation, which includes an upper evaporite band, and the overlying 200 m Eocene to Oligocene Faumai Formation. These are followed in turn by younger sandstones and carbonates.

Skarn style mineralisation in the Ertsberg Mining District is found in both Mesozoic and Tertiary sequences. At both Kucing Liar and Big Gossan ore is hosted by both the Palaeocene Waripi Formation and the sandstones and limestones at the top of the Jurassic-Cretaceous sequence. In the East Ertsberg skarns of GBT, IOZ and DOZ the hosts are the limestones at the top of the Jurassic to Cretaceous, the Waripi Formation and the Faumai Formation, while DOM is exclusively within the Faumai. The different protoliths have produced different skarn mineralogies, which in turn also vary laterally. There are both prograde and retrograde assemblages, and quartz vein stockworks, as well as over-printing hydrothermal breccias.

The reserve remaining in the skarn orebodies is over 400 Mt @ 0.4 to 1.6 g/t Au, 1.2 to 2.7% Cu.
Of this, Kucing Liar accounts for 221 Mt @ 1.57 g/t Au, 1.42% Cu, and
Big Gossan 37 Mt @ 1.02 g/t Au, 2.69% Cu.

Kucing Liar was the subject of one of the papers delivered at an international conference in Perth in late 1998, and printed in the associated volume: Porter T M (Ed.) "Porphyry and Hydrothermal Copper and Gold Deposits: A Global Perspective", now available through PGC Publishing, Adelaide, Australia

The full abstract summarising the deposit, and the reference list from the paper can be displayed by selecting options offered below.

    Abstract   Reference list

For detail consult this paper or other reference(s) listed below.

The most recent source geological information used to prepare this summary was dated: 1999.    
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd.   Unauthorised copying, reproduction, storage or dissemination prohibited.


  References & Additional Information
   Selected References:
Widodo S, Belluz N, Wiwoho N, Kusnanto B, Manning P, Edwards A, Macdonald G  1998 - Geology of the Kucing Liar Ore Body, Irian Jaya, Indonesia: in Porter T M (Ed.),  Porphyry and Hydrothermal Copper and Gold Deposits - A Global Perspective PGC Publishing, Adelaide    pp 49-60

   References in PGC Publishing Books: Want any of our books ? Pricelist
Sugeng Widodo, Belluz N, Nur Wiwoho, Bowo Kusnanto, Manning P, Macdonald G, Edwards A, 1998 - Geology of the Kucing Liar Ore Body, Irian Jaya, Indonesia,   in  Porter T M, (Ed.),  Porphyry and Hydrothermal Copper and Gold Deposits: A Global Perspective,    pp 49-60
Buy   Abstract

Paterson J T and Cloos M, 2005 - Grasberg Porphyry Cu-Au Deposit, Papua, Indonesia: 2. Pervasive Hydrothermal Alteration,   in  Porter T M, (Ed),  Super Porphyry Copper and Gold Deposits: A Global Perspective,  v2  pp 331-355
Buy   Abstract

Paterson J T and Cloos M, 2005 - Grasberg Porphyry Cu-Au Deposit, Papua, Indonesia: 1. Magmatic History,   in  Porter T M, (Ed),  Super Porphyry Copper and Gold Deposits: A Global Perspective,  v2  pp 313-329
Buy   Abstract

Friehauf K C, Titley S R and Gibbins S L, 2005 - Porphyry-Style Mineralisation in the Ertsberg Diorite, Gunung Bijih (Ertsberg/Grasberg) District, West Papua, Indonesia,   in  Porter T M, (Ed),  Super Porphyry Copper and Gold Deposits: A Global Perspective,  v2  pp 357-366
Buy   Abstract

Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge.   It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published.   While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo takes no responsibility what-so-ever for inaccurate or out of date data, information or interpretations.

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