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Barisan Gold’s activities at the Upper Tengkereng porphyry prospect of the Barisan Copper-Gold Project in northern Sumatra are at an all-time high with two deep drill rigs operating 24 hours per day.
The company has received final assay results for a hole completed earlier this year and advice from two holes that are still active.
The completed hole returned 986 metres from 4 metres @ 0.5 grams/tonne gold and 0.3% copper, including 272 metres @ 0.6 grams/tonne gold and 0.6% copper within 594 metres @ 0.6 grams/tonne gold and 0.4% copper. On a whole, this is the highest grade hole drilled so far at Upper Tengkereng.
Upon further review of the core, the drilling intersected two distinct but continuous mineralized zones from 142 to 736 metres that returned significant mineralization.
From 142 to 362 metres, it intersected a high-grade covellite rich silica-pyrophyllite-alunite zone. The zone appears to sit close to surface and has returned the highest-grade copper assays so far intersected at Upper Tengkereng. It appears to be around 200-plus metres in thickness and remains open in all directions.
From 362 to 736 metres, it intersected a high grade chalcocite-chalcopyrite rich zone. This high-grade zone appears to sit immediately underneath the rich covellite zone, starts at about 350 metres in depth, is at least 500 metres in thickness and remains open in all directions and at depth.
Following the results from this hole, Barisan has now identified three distinct high-grade zones at Upper Tengkereng, all of which are open in all directions and at depth.
Drilling over the next few months will look to expand these high-grade zones, delineate them in more details and target the potential for additional high-grade zones. Drilling at a new hole began on May 7 from a new drill platform that has been built on the north side of the highway. The objectives of this hole are to test the vertical true depth and length of the high-grade zone discovered on the eastern edge of the deposit in three previous holes. Due to topographical challenges, the new drill platform could not be built immediately above the high-grade zone but is 22 metres to northwest of the zone.
Drilling has been slower than anticipated due to the unusually high rainfall experienced at site during most of May. Since May 24 the rain has subsided and drilling is now progressing at a normal rate. The hole is being planned to a maximum depth of 1500 metres or until it exits the high grade zone vertically or horizontally.
Another hole began on May 23. Barisan Gold had initially planned to drill it from a new drill platform built in the south of the deposit area, however heavy rainfall during May has rendered such a plan impossible due to the potential for landslides. That proposed hole will now be drilled later this year during the dry season.
The objectives of this hole are to test the extension of the covellite rich zone intersected previously and test the extension of the chalcocite-chalcopyrite rich zone intersected previously. Drilling has been faster than anticipated, averaging more than 40 metres per day. This hole is being planned to a maximum depth of 1500 metres or until it exits the high-grade chalcocite-chalcopyrite rich zone vertically or horizontally. www.barisangold.com