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Location: 8 km S from Brits, South Africa
Old Zandfontein RoadPO Box 513BritsSouth Africa0250
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The Project is located on the Western Limb of the Bushveld Complex in a structurally complex area close to the town of Brits. The geology of the Project Area is located within and adjacent to the Brits Graben and mines the UG2. The Merensky Reef in this area is not currently considered economically viable. The graben and associated faults result in the mine being split into three main sections/mining blocks.The UCZ of the RLS outcrops extensively, striking in an east-west direction and dipping to the north from about 15° to 25°. Both the Merensky Reef and the UG2 outcrop in the area, with a middling of approximately 200 m. The UG2 occurs from outcrop down to a known depth of at least 2,000 m below surface.The UG2 at CRM typically consists of a single chromitite layer some 1.35 m to 1.5 m thick. The leader hanging wall layers are generally absent or have coalesced with the main band to form a virtually homogenous chromitite. A very thin chromitite stringer (~1 mm thick) occurs at varying heights above the top of the chromitite in the immediate hanging wall. However, variations in the thickness of specific lithotypes do exist between individual drillholes, and several disturbances to the layering by pothole structures and mafic pegmatites have been encountered during mining and in some drillholes.Both the Merensky Reef and the UG2 Reef outcrop in the area, with a middling of approximately 220 m. The UG2 Reef occurs from outcrop down to an estimated depth of at least 2,000 mbs. The Merensky Reef is seen as uneconomical in the Project Area, thus the UG2 was investigated.Nature Of, And Controls On, MineralisationThe mineralised units of the Project Area form part of the Bushveld Complex, a large layered igneous intrusive body. In a large, layered intrusion such as the Bushveld Complex, the sulphide droplets that segregate out of the parental magma will eventually settle out of the magma, and once magma convection ceases are deposited on already consolidated layers of the magma chamber to form sulphide-rich zones.The Merensky Reef has traditionally been the most important PGM producing horizon in the Bushveld Complex. In addition to PGM mineralisation associated with the Merensky Reef, all chromitite layers in the Critical Zone of the Bushveld Complex contain elevated concentrations of PGM. The UG2 is the only chromitite layer where significant mining of PGM takes place. The UG2 of the Western Bushveld Limb is generally less than 1 m thick, and is comprised of 60% to 90% chromite, however in the Project Area the thickness of the UG2 tends to average 1.3 m to 1.5 m. The PGMs are interstitial to the chromite grains, and are concentrated at the base and middle of the chromitite layer.The UG2 at CRM has on average a 4E prill ratio of 62:27:10:1, derived from the drillholes with individual prill analyses. The prill Split Ration is calculated from the mining cut width ratios of elements. The mining cut selection is based on the UG2 reef width plus 20 cm footwall. The footwall cut was included as mineralisation occurs below the base of the UG2.
