The Batu Jagung prospect, located in the northern section of the 6 Km x 4 Km Lakuwahi Project's magnetite destruction zone, had been tested historically by three holes (Billiton, 1999); two of which intersected significant silver and base metal grades.

This prospect is characterised by large areas of mineralised outcrop and strong multi-element soil geochemistry; and a large resistivity geophysical anomaly. The silver grades in soils reached as high as 158 g/t.

Billiton hole number LWD009 intersected an upper zone of high-grade silver in oxide which is underlain by strongly brecciated and mineralised volcanic rocks, containing potentially economic grades of lead, zinc and silver.

The main mineralised zones in LWD009 are as follows;

• 50m @ 93.5 g/t Ag from 6m
• 111m @ 1.55% combined Pb / Zn / Cu (0.76% Pb, 0.74% Zn, 0.05% Cu, 22 g/t Ag) from 43m including:
  • 16m @ 2.79% combined Pb / Zn / Cu (1.37% Pb, 1.29% Zn, 0.33% Cu 0.13 g/t Au, 42 g/t Ag) from 51m

Nearby Billiton hole LWD010 has an even more impressive zone of polymetallic base metals which is also rich in silver:

• 100m @ 3.23% combined Pb/Zn/Cu (1.88% Pb, 1.27% Zn, 0.08% Cu, 38 g/t Ag) from 40m including:
  • 33m @ 4.49% combined Pb/Zn/Cu (2.78% Pb, 1.58% Zn, 0.13% Cu, 45 g/t Ag) from 78m

The results from Batu Jagung have not been incorporated in the JORC mineral resource estimate.

Following the 2011 IP-Resistivity geophysical survey, the Batu Jagung target has been completely reinterpreted and re-evaluated. The extensive anomaly is now assessed as having the potential of a very large body of silver and base metal mineralisation.

By virtue of the reinterpretation, the 2012 drilling programme will feature drill holes in more favourable positions and orientations than previously achieved by Billiton. Robust is currently using a diamond drill rig from its owner-operated fleet to explore this potential at Batu Jagung.