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INDONESIAN EXPLORATION OFGOLD & COPPER

Barisan Porphyry Belt

Upper Tengkereng Porphyry Cu-Au Prospect


The Upper Tengkereng prospect is located approximately 1.8 km northeast of the Lower Tengkereng prospect. The geological setting is very similar to that at Lower Tengkereng and it is possible that the two systems are linked beneath the volcanic cover sequence. The Upper Tengkereng prospect was evaluated by CRA Exploration in the mid-1990s with a program of exploration that included diamond drilling. Work done by Barisan Gold's predecessor company, East Asia Minerals, to follow-up CRA Exploration's earlier work has consisted of geological mapping, sampling and the drilling of two diamond holes. Widespread, moderate-grade gold and copper mineralization is associated with quartz veins and stockworks that locally form breccias within intensely altered diorite porphyry. The alteration consists of advanced argillic in outcrops and in the upper parts of the system and a mixture of argillic and phyllic alteration deeper in the system. Sulfide minerals, consisting of pyrite, minor chalcopyrite and covellite and trace amounts of chalcocite occur in both the quartz veins and as disseminations throughout the altered rock.

Hole No. From (m) To (m) Interval (m) Au (g/t) Cu (%)
UTD001A 0 646.25 646.25 0.39 0.21
Includes 14 82 68 0.51 0.21
and 82 318 236 0.23 0.19
and 318 586 268 0.57 0.26
Includes 354 402 48 0.91 0.35
and 566 586 20 0.83 0.39
UTD002 6 696.9 690.9 0.39 0.3
Includes 6 120 114 0.41 0.19
and 172 340 168 0.28 0.57
Includes 250 340 90 0.36 0.71
and 380 436 56 0.66 0.2
and 576 596 20 0.87 0.26
and 638 696.9 58.9 1.17 0.48
Includes 638 678 40 1.46 0.48
UTD003 8 922.4 904.4 0.41 0.25
Includes 238 292 54 0.59 0.24
and 428 690 262 0.81 0.49
and 690 758 68 0.52 0.35
UTD004 664 866 202 0.70 0.40
Includes 320 350 50 1.22 0.41
UTD005 520 868 348 0.90 0.40
Includes 442 472 30 0.81 0.25
and 520 710 190 1.30 0.55
Includes 714 742 28 0.65 0.48
UTD006 4 990 986 0.5 0.3
Includes 142 414 272 0.6 0.6
UTD007 292 800 508 0.65 0.4
Includes 510 800 290 0.8 0.5
UTD008 4 600 596 0.5 0.5
Includes 188 600 412 0.7 0.7



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