The Asia Miner

JAN-FEB 2018

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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26 | ASIA Miner | Volume 15 • Issue 1 | 2018 Indonesia MAPPING and sampling work by Arc Explo- ration at Jerambah prospect of the Treng- galek project in East Java has identified two drill targets. The encouraging results have prompted the company to undertake scout drilling at the prospect. The Trenggalek Exploration IUP tenement is held by Arc's Indonesian partner, PT Sumber Mineral Nusantara (SMN). The ten- ement, covering 29,969 hectares, is valid until November 2018. Arc is in the process of renewing a forestry permit affecting 3393 hectares within the tenement area. PT Danusa Tambang Nusantara, a sub- sidiary of one of the largest contract miners in Indonesia, is managing and funding ex- ploration work at Trenggalek. Trenggalek lies in the prospective South- ern Mountains Province of East Java, which contains the large Tumpangpitu porphyry copper-gold deposit in the Tujuh Bukit dis- trict. Jerambah is about 5km west of the Sing- gahan prospect. It is an extensive 2km by 1.5km silica-clay-pyrite alteration zone cen- tred on igneous intrusions mapped at sur- face. Jerambah was tested by a single drill hole during the Anglo-American Joint Venture. The hole was drilled to a depth of 1022 metres and intersected an extensive hydro- thermal alteration and pyrite mineralisation with traces of base metal mineralisation. Arc believes this hole was drilled on the margin of an anticipated copper-gold system. Subsequent soil sampling and spectral analyses showed a new cluster of over- lapping spotty copper-gold-molybdenum anomalies reporting up to 348 ppm copper, 0.095 ppm gold and 59 ppm molybdenum to the north of the drill hole. In recent months this area was re-mapped and resampled on a more detailed ba- sis with Induced Polarisation (IP) and ground magnetic surveys conducted. This work identified outcrops of diorite with quartz-sericite-(chlorite) alteration and quartz stockworks. Alteration zones were mapped with the aid of a Terraspec machine. An IP survey was conducted in July and August 2017 along 10 lines using a 50 me- tre dipole spacing with two additional lines using a 200 metre dipole spacing to obtain a deeper profile. The ground magnetic sur- vey confirmed the mapping results that the area is dominated by dioritic rocks with a strong NW-SE structural control. The IP and magnetic results combined with re-interpretation of aeromagnetic data, spectral analyses, re-mapping and re-sampling of the area have identified two drill targets. Arc begins Jerambah scout drilling Drilling at Arc Exploration's Trenggalek project in East Java.

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