Arc Exploration: Drilling commences at Trenggalek
Monday, October 7 2013 - 02:43 AM WIB
ASX-listed mineral exploration company Arc Exploration Limited reported that drilling has commenced on the Trenggalek Project in East Java with its joint venture partner, Anglo American, who are fully funding the program.
The Trenggalek Project lies in the prospective Southern Mountains Province of East Java, which contains the giant Tumpangpitu porphyry copper-gold deposit in the Tujuh Bukit district.
The company said in a statement obtained Monday that the current program was planned to test a number of geophysical targets associated with possible porphyry copper-gold systems located beneath large near-surface alteration features. The geophysical targets were generated from the earlier airborne magnetics/radiometrics survey and are ranked with the results of surface geochemical sampling, detailed mapping and alteration studies.
The first target to be tested is the recently identified Jerambah Prospect, located about 2 km southwest of the Buluroto epithermal gold-breccia prospect on the southern side of the Trenggalek tenement, the statement said.
It said that previous drilling at Buluroto returned narrow epithermal gold intercepts that included 2m @ 8.7 g/t gold in TRDD032. Copper sulphide mineralisation in silicified breccia was intersected in another hole, TRDD025, returning a broad gold-copper-molybdenum intercept of 24.5m @ 0.51 g/t Au, 0.21% Cu & 16 ppm Mo from 138.5m depth. This latter intercept provided one of the first indications of the deeper porphyry potential at Trenggalek.
?The subsequent discovery of a large high-sulphidation epithermal alteration system centered on quartz-feldspar porphyry intrusions at Sumber Bening Prospect, located on the western side the Trenggalek tenement, provided further evidence for porphyry potential on the Trenggalek tenement,? the company said.
The first hole in the current program will test a recently identified large silica-clay-pyrite alteration zone (+2.5 km x 1 km) centered on quartz diorite/quartz feldspar porphyry intrusions. Geophysical modelling of the airborne magnetics and radiometric data has highlighted a geophysical target beneath this large outcropping alteration zone.
?Drilling has commenced at the Jerambah Prospect, one of several targets identified on the Exploration IUP. Further interpretative and field work is also underway with the aim of firming up a pipeline of other targets for drill testing,? commented Managing Director Jeffrey Malaihollo.
?Previous drilling at Trenggalek has identified several shallow epithermal gold-vein and breccia systems. This exciting new phase of exploration is testing for deeper porphyry copper-gold systems associated with geophysical anomalies detected beneath large near-surface alteration features,? he added.
Editing by Reiner Simanjuntak