ENCOURAGING results have been received from soil sampling recently completed on the Singgahan prospect in the southeast corner of Arc Exploration’ Trenggalek exploration IUP. Singgahan was previously highlighted by gold-copper drainage anomalies and from targets generated by an airborne magnetics survey.

The location of Arc Exploration’s two projects in Indonesia.
The location of Arc Exploration’s two projects in Indonesia.

Results of the sampling have highlighted several geochemical anomalies within the grid area, including a 500 metres-wide by 1000 metre-long coincident gold-copper-molybdenum anomaly underlain by a silica-clay-pyrite altered diorite intrusion in andesitic volcanic and volcaniclastic rocks. The main anomaly is highlighted by plus-20 ppb gold, plus-90 ppm copper and plus-4 ppm molybdenum contours and contains peak results of 0.191 ppm gold, 585 ppm copper and 29 ppm molybdenum.

The gold-copper-molybdenum soil anomaly occurs within a prominent northwest-trending structural corridor that extends across the IUP and includes several other major gold and copper-gold prospects including Sentul, Buluroto and Sumber Bening further to the northwest.

Follow-up work is in progress and will include benching, continuous rock sampling and Terraspec work (identifying alteration minerals) to provide further definition of the geochemical anomalies.

Arc’s managing director and CEO Jeffrey Malaihollo says, “These results are encouraging and support our belief in the potential for multiple targets within the Trenggalek project. Trenggalek lies on the relatively under-explored western end of the segment of a magmatic belt that hosts the Tumpangpitu gold-copper deposit in the Tujuh Bukit district further to the east.”

Arc has a joint venture with PT Sumber Mineral Nusantara (SMN), an Indonesian company which holds the Trenggalek exploration IUP tenement that covers an area of about 300sqkm in the Southern Mountains of East Java.

In December 2012, Arc announced that Anglo American had elected to enter into an agreement with the company and SMN to farm into the Trenggalek project. Exploration activities at Trenggalek are currently managed by Arc but fully funded by Anglo American.

Work thus far has identified a large high-sulphidation epithermal alteration system at Sumber Bening and other areas that may be linked to porphyry gold-copper targets at depth. The project area lies within the same belt of rocks that hosts major porphyry copper-gold deposits including Tumpangpitu in East Java, and Batu Hijau and Elang on Sumbawa.

An extension to the Pinjam-Pakai (Borrow Use) Forestry Permit for the Trenggalek IUP was granted by the Indonesian Ministry of Forestry and is valid until November 3, 2015. This allows the company to conduct exploration work on several targets in production forestry areas within the tenement. Arc also a strategic alliance with Anglo American in Papua.

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