Trenggalek Project, East Java (ARX – 95%)
The Company operates a joint venture with P.T. Sumber Mineral Nusantara ("SMN") which holds an Exploration KP license covering an area of 30,044 ha in the Southern Mountains of East Java Province.
The Southern Mountains comprise an older segment of the Sunda-Banda magmatic arc and is known to host numerous but underexplored gold, silver and base metal vein and skarn prospects. Of further significance is the emergence of a potentially major porphyry copper-gold discovery in the Southern Mountains at Tujuh Bukit, near the eastern tip of East Java.
The geology at Trenggalek comprises Oligo-Miocene intermediate-felsic volcanic and volcaniclastic rocks, fossiliferous limestone and clastic sedimentary rocks intruded by intermediate-felsic plugs and domes. Erosional remnants of mineralised hot-spring depositional features (i.e. sinters, hydrothermal breccias and veins) are widespread in the project area.
ARX's partner, SMN, was granted the KP in late 2005, after the ground had been previously held under separate KPs by P.T. Aneka Tambang ("Antam"). Work completed by ARX to-date has included detailed mapping and prospecting. This has confirmed the presence of three previously defined mineralized vein systems and has identified several new areas of high-grade vein float.
The three defined mineralized vein systems (Sentul, Buluroto and Kojan) were traced over several kilometres strike-length in earlier mapping and trenching completed by Antam. Results from the Antam work included intercepts of up to 10 m at 12.6 g/t Au in trenching and 2.6 m at 10.1 g/t Au in diamond drilling at Buluroto. Our own limited trenching returned 3 m at 7.6 g/t Au and a grab sample of 149 g/t Au at Sentul. All three prospects had limited previous drill testing and we strongly believe that there is significant potential to discover high-grade ore-shoots along the vein structures.
Prospecting and mapping completed in the northern half of the KP have highlighted new areas of vein float, with higher grade samples ranging from 7 to 46 g/t Au. These are associated with extensive areas of sulphidic replacement silicification and hydrothermal brecciation returning highly arsenic-antimony-mercury geochemistry in rock chip samples. The primary source(s) of this vein float remains to be identified. Its distribution within about a 30 km2 area and association with near-surface hot spring depositional features suggests very good potential for discovering blind and shallowly eroded, high-grade epithermal gold-vein deposits in the project area.
Results at Trenggalek are very encouraging and indicate the potential for a high-grade epithermal gold-vein field in the Southern Mountains of East Java.
Trenggalek Project - Photo Gallery
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