The location of the Selinsing and Buffalo Reef mineralization is 1Km East of a regional crustal suture named the Raub-Bentong Suture, approximately north-south oriented in the region. The resulting local structuring controls the shearing vein mineralisation observed in these deposits. Main rocks are Permian sedimentary rocks and volcanic tuffs, contacting with limestones. The host rocks for the mineralised shear zone consist of a series of finely interbedded argillites and very fine-grained arenites, along with sequences of quartz-rich, variably silicified sediments of likely tuffaceous origin, which are referred to as “felsic tuff” and a few thin beds of quartzite conglomerate. In the contact with hanging wall limestone to the East, there are some discontinuous carbonaceous shale bodies. The rocks tend to be more clayey at Buffalo Reef Deposits.
The Selinsing gold deposit is hosted by a 30 to 50 meter thick shear zone that dips steeply towards mine grid east (082° true grid) at angles between 55° and 75°. This zone or “envelope” of sheared rocks has been variably mineralized and intruded by gold-bearing quartz veins and stockworks of quartz veinlets. The quartz veins are likely to have been emplaced along individual fault surfaces. The faulting is thought to be essentially dip-slip reverse thrusting caused by compression from the east. Within the shear zone, there are distinctive tectonic-deformed rock types, the most noticeable of which are cataclasites and mylonites.
The Mesothermal lode gold deposits along Selinsing and Buffalo Reef deposits are structurally controlled and thought to be part of the same structural trend, with the Buffalo Reef deposit occurring along strike and to the north of the Selinsing deposit, containing auriferous quartz-pyrite-arsenopyrite ± stibnite veining, and associated hydrothermal alteration. The gold occurs within moderately to steeply east-dipping veins and fracture zones, ranging from 1 m up to 15 m in thickness (average thickness is approximately 10 m in the main mineralised veins).
Felda Block 7 is adjacent east of Buffalo Reef Central (“BRC”) and Buffalo Reef South (“BRS”), and contains the extension of the Buffalo Reef oxide and sulphide ore bodies, within the same structure.
At Peranggih, the recent work indicated that the gold mineralization is associated with a hydrothermal breccia system which is distinct from the hydrothermal veins system that occurs at Selinsing and Buffalo Reef, but still related to the same regional shearing structuring. The low and high grade gold mineralization is hosted in both matrix supported and clast supported quartz breccia. Significant coarse free gold was observed hosted in the breccia matrix. The matrix is friable and of loose material composed of clay minerals and small rock fragments, as well as mixed mineralization and/or gangue minerals. This leads to a nugget effect on the gold distribution throughout the deposit. The system extends over a distance of approximately 1.2 kilometers in length with varying widths of between 25 to 50 meters with identified areas of high gold grade mineralization surrounded by a halo of lower grade mineralization. The system is open down dip and along strike.