Intrepid reports drilling result from E. Java gold project
Thursday, February 19 2009 - 06:33 AM WIB
GTD 56 was drilled between the previously reported porphyry and high sulphidation mineralisation intersected in holes GTD 29 and 35.
The result from Hole 56 has delivered improved interpretation of possible geometries for the high sulphidation system which overlies and overprints the deeper and more typical porphyry mineralisation.
Results from Hole 56 are:
High sulphidation mineralization
76 - 274 metres: 198 metres at 0.26 grams per tonne gold, 12 grams per tonne silver and 0.25% copper
Including
76 - 122 metres; 46 metres at 0.27 grams per tonne gold and 0.26% copper, and 10 grams per tonne silver
156 - 178 metres: 22 metres at 0.36 grams per tonne gold and 0.43% copper and 16 grams per tonne silver
228 - 274 metres: 46 metres at 0.56 grams per tonne gold and 0.47% copper and 33 grams per tonne silver.
Porohyry copper-gold mineralization
450 - 676 metres; 226 metres at 0.72 grams per tonne gold and 0.44% copper
Including
484 - 584 metres: 100 metres at 0.95 grams per tonne gold and 0.67% copper
550 - 584 metres: 34 metres at 2 grams per tonne gold and 1% copper.
The diagrams below show drill intercepts and mineralisation types on a composite cross section across zones A and C, and in greater detail across Zone C and the deep intercepts of holes 29, 56 and 35.
Three zones of mineralisation have been defined
1. the near surface oxide gold-silver mineralisation which is interpreted to be an oxidized derivative of the underlying high sulphidation sulphide zones. Zones A and C - current combined Inferred Resource estimate stands at 2.57 million ounces gold equivalent (gold and silver) at a 0.5 gram per tonne gold-equivalent cut-off.
2. a high sulphidation copper-gold-silver zone with associated intense clay-silica alteration of lithic tuffs and some lesser hydrothermal breccias.
3. porphyry copper-gold zone associated with quartz-magnetite veining.
The geometry of the high sulphidation zones presented on the sections is a current working model and may change as additional drill holes are completed.
Hole 46 was drilled in late 2008 on the eastern side of the prospect to assist in defining the geometry of the zone beneath the Zone A oxide mineralisation. The hole 46 intersected widespread propylitic and clay alteration that most likely defines a marginal zone to the high sulphidation mineralisation. At the base of the hole, assays returned 33 metres at 0.23 grams per tonne gold and 0.2% copper in clay and hematite altered material which is interpreted to be a high suiphidation overprint on a quartz-magnetite veined porphyry zone that appears open at depth below the end of hole.
The zone of high sulphidation and porphyry mineralisation across holes 29,56 and 35 on section covers a width of 500 metres.
An extensive soil geochemistry program is currently underway at Tujuh Bukit and additional detailed geophysics are being planned for the second quarter of 2009. These data will allow for further definition of sulphide drill targets.
*2.57 Million ounce gold equivalent Inferred Resources based on ?
? Zone C: 1.1 Million ounce gold equivalent Inferred Resource at a 0.5 gram per tonne gold equivalent cut-off based on 39.3 Million tonne at 0.55 grams per tonne gold, 26 grams per tonne silver
? Zone A: 1.47 Million ounce gold equivalent Inferred Resource at a 0.5 grams per tonne gold equivalent cut-off based on 43.6 Million tonne at 0.62 grams per tonne gold, 28 grams per tonne silver. (end of edited release)