The Batu Mas (meaning 'Gold Rock' in Bahasa Indonesia) prospect was another first drilled by Billiton Indonesia in the late 1990's after being identified as a target through soil geochemistry and mapping exercise over the Lakuwahi Caldera.

Batu Mas has a similar geology to the Batu Hitam prospect although the silica-barite stockwork is more intensive with a corresponding increase in the level of the gold mineralisation. Significant base metal intersections are also observed within the altered andesitic basement with grades as high as 2 metres @ 21% combined Lead-Zinc mineralisation seen in hole LWD025.

Highlights of the assay results for the Robust Resources' holes are as follows:

LWD 017:

27 metres at 2.19 g/t Au and 48 g/t Ag from 22m

  LWD 018:

This hole was abandoned well short of its target depth due to drilling problems and was re-drilled as LWD025. Results from the abandoned hole were as follows:

6.65 metres at 0.31 g/t Au and 34 g/t Ag from 38.4m

  LWD 019: 18.1 metres at 0.55 g/t Au and 11 g/t Ag from 33m
  LWD 020: 33 metres at 1.45 g/t Au and 111 g/t Ag from 18m
Including:
11.0 metres at 2.46 g/t Au and 113 g/t Ag from 28m
  LWD 021: 2.45 metres at 3.10 g/t Au and 29 g/t Ag from surface
And:
20.6 metres at 1.07 g/t Au and 46 g/t Ag from 27.35m
  LWD 022: 7.0 metres at 1.01 g/t Au and 21 g/t Ag from 33m
  LWD 025: 23m @ 0.52g/t Au, 23g/t Ag, 2.54% Pb and 2.27% Zn
Including:
3.7 metres at 1 g/t Au, 55 g/t Ag, and 13.23% Combined Pb-Zn
And:
2 metres at 1.51 g/t Au, 89 g/t Ag, and 21.04% Combined Pb-Zn

Detailed location plan of Robust Resources' Drilling at the Batu Mas Prospect

Detailed location plan of Robust Resources? Drilling at the Batu Mas Prospect
Click to view enlarged image

Drill Section 317595E showing the distribution of gold-silver mineralisation

Drill Section 317595E showing the distribution of gold-silver mineralisation
Click to view enlarged image

Drill Section 317630E showing the distribution of gold-silver mineralisation

Drill Section 317630E showing the distribution of gold-silver mineralisation
Click to view enlarged image

Robust's current plans for exploration at the Batu Mas prospect include extensional diamond drilling and test shaft to gather bulk sample for metallurgical testwork.