Copper potential of KSK COW - Kalimantan Gold Corporation Limited

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Beruang Kanan
The Beruang Kanan prospect is located within a 10-12 km wide circular feature near
the intersection of regional NE and NNW-trending structures (Fig. 4). Alteration and
mineralization at Beruang Kanan extends over an area of some 16 km 2 and is hosted
within dacite tuff and volcaniclastic rocks. Soil geochemistry and geophysical data (IP
and ground magnetics) have delineated three main prospects, the Main, South and
West zones.
Figure 4. Interpreted circular features, domes, faults and dilation zones in the
southeastern part of the KSK COW (after Murphy, 2003).
The Main Zone is an area of coincident copper, gold and molybdenum anomalism in
soils and is associated with strong phyllic alteration (Figs. 5-7). Leach (2001) reported
that alteration is zoned from deeper to shallower levels: chlorite-sericite-quartz-pyritechalcopyrite
→ quartz-sericite-pyrite-chalcopyrite-bornite → quartz-dickite/kaolinitepyrite-chalcopyrite-bornite-tennantite
→ quartz-alunite-pyrite-barite-enargite. Leach
(2001) also reported an apparent zonation from chlorite-sericite-rich assemblages at
deeper levels to the east to advanced argillic assemblages at shallow levels to the
west, suggesting a fluid source deeper and to the east.
Previous drilling in the Main Zone has intercepted potentially economic grades of
copper mineralization over considerable down hole intervals (Table 4). Near surface
mineralization is dominated by supergene chalcocite and minor chrysocholla and
malachite, while at deeper levels the hypogene mineralization is dominated by
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Peter J. Pollard
Copper potential of KSK COW, Central Kalimantan