Barisan Porphyry BeltThe Barisan Porphyry Belt is located in Indonesia's Aceh Province. The Project consists of two contiguous license areas totalling 151,618 hectares. Barisan Gold has identified a 5x15 km corridor that encompasses six drill ready porphyry prospects, four of which have had historical drilling in the late 1990s by operators such as Rio Tinto/North who abandoned the region in 2000 due to civil unrest. In 2007, Barisan Gold's predecessor company, East Asia Minerals, acquired the Project following a peace agreement in the region.
These six porphyry prospects include:
- Upper Tengkereng
- Lower Tengkereng
- Upper Ise Ise
- Middle Ise Ise
- Lower Ise Ise
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Upper Tengkereng Porphyry Cu-Au Prospect
The Upper Tengkereng prospect is located approximately 1.8 km northeast of the Lower Tengkereng prospect. The geological setting is very similar to that at Lower Tengkereng and it is possible that the two systems are linked beneath the volcanic cover sequence. The Upper Tengkereng prospect was evaluated by CRA Exploration in the mid-1990s with a program of exploration that included diamond drilling. Work done by Barisan Gold's predecessor company, East Asia Minerals, to follow-up CRA Exploration's earlier work has consisted of geological mapping, sampling and the drilling of two diamond holes. Widespread, moderate-grade gold and copper mineralization is associated with quartz veins and stockworks that locally form breccias within intensely altered diorite porphyry. The alteration consists of advanced argillic in outcrops and in the upper parts of the system and a mixture of argillic and phyllic alteration deeper in the system. Sulfide minerals, consisting of pyrite, minor chalcopyrite and covellite and trace amounts of chalcocite occur in both the quartz veins and as disseminations throughout the altered rock.
|Hole No.||From (m)||To (m)||Interval (m)||Au (g/t)||Cu (%)|
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Lower Tengkereng Porphyry Cu-Au Prospect
The Lower Tengkereng prospect is located approximately 15 km south-southeast of the Abong prospect within the Barisan II IUP. Porphyry copper-gold mineralization was discovered by CRA Exploration in the late 1990s following a program of exploration that involved the drilling of seven (7) diamond drill holes. East Asia Minerals has undertaken a program of work, including two successful diamond drill holes, which has confirmed the results of CRA Exploration and provided further information on the geology and mineralization. The geology of the prospect is dominated by strongly altered diorite porphyry that has intruded andesitic volcanics, volcaniclastic sediments and limestone of the Mesozoic Kenyaran Volcanic Formation. Later volcanics locally overlie the diorite. Work by East Asia Minerals, Barisan Gold's predecessor company, has demonstrated that widespread, moderate-grade gold and copper mineralization is hosted within altered diorite porphyry. East Asia Minerals drilled 2 holes at Lower Tengkereng in 2010. Both holes hit mineralization from surface to the end of the hole, confirming the presence of a significant gold copper porphyry system.
|Hole No.||From (m)||To (m)||Interval (m)||Au (g/t)||Cu (%)|
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Upper Ise Ise Porphyry Cu-Au Prospect
The geology of this prospect, which is located approximately 16 km southeast of Abong and 2.5 km northeast of Upper Tengkereng, is dominated by four dioritic stocks ranging from coarse grained, through medium grained and porphyritic, to fine grained variants that have been intruded into the Kenyaran Volcanic Formation. CRA Exploration evaluated this prospect during its exploration campaign in the mid 1990s and completed a limited amount of drilling. Mapping and sampling by East Asia Minerals has confirmed the presence of anomalous gold and copper mineralization hosted by altered diorite. The associated alteration consists of an initial quartz-sericite-pyrite event overprinted by widespread silicification and quartz-pyrite stockworks. East Asia Minerals drilled one hole on this prospect in 2011. The hole hit mineralization from surface to the end of the hole 800.95 meters below surface, confirming the presence of a significant gold copper porphyry system.
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Bahu Porphyry Cu-Au Prospect
This prospect is located approximately 10 km southeast of Abong and 3.5 km north of Upper Ise Ise. Work undertaken by East Asia Minerals, to follow-up encouraging results by previous explorers, has consisted of geological mapping, rock-chip and channel sampling and a ground magnetic survey. This work has outlined a large area (2.3 km x 1 km) of alteration of diorite porphyry and enclosing sediments. Alteration consists of quartz-sericite-pyrite±illite overprinted by structurally controlled advanced argillic and argillic styles. Quartz-pyrite veins and stockworks are present and likely host the moderate grades of gold mineralization that have been identified from rock and channel sampling; 46 m at 0.72 g/t Au and 268 ppm Cu, and 30 m at 0.71 % Au and 341 ppm Cu being some better examples.
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Middle Ise Ise Porphyry Cu-Au Prospect
This prospect is located about 8 km southeast of Abong. Geological mapping, rock-chip and channel sampling by East Asia Minerals has outlined altered and gold-copper mineralized diorite and quartz diorite over an area of 1,200 m x 500 m. The alteration assemblages that have been recognised are advanced argillic, quartz-clay-pyrite (locally phyllic), argillic and propylitic. Sugary quartz veins and silica-alunite veins are present. Sulfides that have been noted are pyrite and minor chacocite, covellite and chalcopyrite. The best results reported from channel sampling to date is 10 m at 0.17 g/t Au and 0.21% Cu.
Lower Ise Ise Porphyry Cu-Au-Mo Prospect
The prospect is located approximately 5 km south of Abong and is defined by a historical gold- copper-molybdenum soil anomaly. East Asia Minerals and Barisan Gold have yet to undertake any exploration work of significance at this prospect.