Copper potential of KSK COW - Kalimantan Gold Corporation Limited

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Beruang Tengah
The Beruang Tengah prospect is hosted within the same circular structure and
southeast of Beruang Kanan (Fig. 4). Copper-gold mineralization is hosted within
dioritic to dacitic intrusions that were emplaced between sediments and tuffs to the
west and older granodiorite to the east. A zone of intense quartz-sericite alteration and
sheeted sulphide-quartz veins surrounds a central zone of biotite-magnetite alteration,
and quartz stockwork veins crop out at lower levels (Geiger and Prasetyo, 2004). A
400 metre wide zone of >0.1% copper in rock chips (Fig. 11) coincides with the zone
of quartz-sericite alteration. Some 500 metres to the west, a 1 km long zone of phyllic
alteration coincides with a zone of >0.1 g/t Au in soils (Geiger and Prasetyo, 2004).
Three previous diamond drill holes intersected low-grade copper-gold mineralization
at Beruang Tengah (e.g. BT2 – 240 metres @ 0.19% Cu and 0.12 g/t Au) and together
with the mapped alteration at surface, have indicated the presence of a porphyry
copper-gold system with significant molybdenum.
Oxiana Limited drilling
Oxiana Limited drilled one additional hole at Beruang Tengah which targeted high
copper in rock chips (Fig. 11), known phyllic alteration, as well as an outcropping
milled breccia. The hole returned low values of copper and gold (Table 4), especially
in the milled breccia which from observations of the skeleton core is a post-mineral
feature.
Drill hole From (m) To (m) Cu (%) Au (g/t) Mo (ppm)
KBT 004 19.7 121.0 0.12 0.2 42
KBT 004 232.2 507.5 0.08 185
Table 4. Mineralized intercepts in KBT004 at Beruang Tengah.
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Peter J. Pollard
Copper potential of KSK COW, Central Kalimantan