Sumatra Copper & Gold: Further Tembang high grade drilling results
Thursday, June 17 2010 - 01:44 AM WIB
Tembang Drilling Update
The Tembang project is located approximately 120 kilometres north-northeast of Bengkulu in South Sumatra province. Tembang is a large intermediate-sulphidation epithermal deposit comprising gold-silver bearing quartz veins hosted by Tertiary volcanics. The Company has rights to two IUPs totalling an area of some 850 km2 over and around the former Rawas mine that operated between 1997 and 2900.
A total of 26 holes have been completed during the current programme of diamond drilling designed to test the down dip extensions of the higher grade vein systems at Buluh, Bujang, Nun and Belinau.
Results have now been received for 4 holes drilled into the main Berenai vein, Berenai together with Nun contributed approximately 70% of the ore mined previously by Barisan Tropical Mining (BTM), and constitutes some 30% of the existing JORC resource. A review of the old BTM drill data has indicated the presence of two high grade shoots (>1 5mg/t Au) open at depth.
The current drilling programme has concentrated on the southern shoot and has succeeded in pushing the shoot deeper with continuing high grades. Notable results include RDD10064 13.3 metres @ 2.91g/t Au, 3.5g/t Ag including 2.8metres grading 8.13g/t Au, 1.4g/t Ag, RDD10066 15.15 metres @ 4.94g/t Au, 5.0g/t Ag including 7.1 metres grading 9.39g/t Au, 7.1g/t Ag and RDD10067 5.6 metres @ 6.91g/t Au, 87.7g/t Ag including 3.1 metres grading 12.12g/t Au, 89.4g/t Ag. Further step out drilling will require a larger rig than the one currently on-site; the larger rig will also allow drilling of the northern high grade shoot.
Geological re-interpretation
These new high grade drilling intercepts at Tembang, in addition to those reported earlier at Belinau and Nun, indicate that higher grade zones exist at depth that were not previously explored or mined by BTM. Further the Company?s current mineral resource, which is based primarily on previous BTM drill data, does not therefore fully reflect this higher grade potential.
Our understanding of the vein systems suggests that considerable depth potential exists for higher grade shoots extending below the known vein systems, in particular below the largest vein/halo system mined to date at Berenai/Nuri. Tembang is most likely an intermediate suiphidation epithermal vein system similar to our own Lebong Tandai and the Co-O mine complex in the Philippines. By analogy, Tembang could potentially have shoots that extend > 200 metres downdip.
A major drilling program is being prepared to further explore and define these higher grade shoots underneath what appears to be a lower grade cap. These holes hold the promise to multiply the resource potential of Tembang several times. (end of edited release)