Geology of the Shinas Mine

The Shinas deposit (1.42 Mt @ 2.0% Cu) occurs about 5 km to the east of the Hatta deposits, adjacent to an isolated gossan developed on silica-rich stockwork mineralisation. The lack of outcrop in the area means that the detailed stratigraphic position of the deposit is difficult to assess, but the general easterly dip of the succession means that it likely formed higher in the volcanic stratigraphy than the Hatta deposit.


The Shinas deposit consists of a gently ESE-dipping massive sulphide lens overlying a broad stockwork zone. The sulphide assemblage is similar to that of Hatta (pyrite, chalcopyrite and chalcocite), but the mineralisation is typically more silica-rich, reflecting a late stage of hydrothermal veining that in places has formed silica-cemented sulphide breccias (silica-massive sulphide; SMS). The massive sulphide mound is overlain by thin layers of sedimentary umber and is intruded by two major WNW-trending dolerite dykes.