Renison is the largest of three major Skarn, carbonate replacement, pyrrhotite-cassiterite deposits within western Tasmania. The Renison Mine area is situated in the Dundas Trough, a province underlain by a thick sequence of Neoproterozoic Cambrian siliciclastic and volcaniclastic rocks. At Renison there are three shallow-dipping dolomite horizons which host replacement mineralisation.

Mount Bischoff is the second of three major Skarn, carbonate replacement, pyrrhotite cassiterite deposits within western Tasmania. The Mount Bischoff Mine area is situated within the Dundas Trough, a province underlain by a thick sequence of Neoproterozoic- Cambrian siliciclastic and volcaniclastic rocks. At Mount Bischoff folded and faulted shallow dipping dolomite horizons host replacement mineralisation with fluid interpreted to be sourced from the forceful emplacement of a granite ridge and associated porphyry intrusions associated with the Devonian Meredith Granite, which resulted in the complex brittle / ductile deformation of the host rocks. Lithologies outside the current mining area are almost exclusively metamorphosed siltstones. Major porphyry dykes and faults such as the Giblin and Queen provided the major focus for ascending hydrothermal fluids from a buried ridge of the Meredith Granite. Mineralisation has resulted in tin-rich sulphide replacement in the dolomite lodes, greisen and sulphide lodes in the porphyry and fault / vein lodes in the major faults. All lodes cont ........

Renison mine production stabilises at approximately 930,000 tonnes per annum (tpa) after an initial ramp-up from approximately 900,000 tpa, with production rate limited by stope production scheduling and underground asset capacity. Over the 10 year mine life, Area 5 contributes approximately 40% of total contained tin in mine production.

Area 5 subset Ore Reserve of 3.30 Mt at 1.87% Sn for 61,900 tonnes of contained tin, including 2.2 Mt at 2.11% Sn for 46,400 tonnes of contained tin from a distinct high-grade portion of the Mineral Resource.

Area 5 Mine Design
Renison staff selected mine design is based on a stope size of approximately 15 m x 15 m, and vertical stope height of 40 m. Hangingwall exposures have been minimised by creating vertical walls across the orebody (where required).

Long hole stoping with engineered backfill was selected to extract the wide orebody in Area 5. Mining will be in a bottom up sequence and a single continuous mining front from the north.

Area 5 Ventilation
The Area 5 Study has recommended the development of the No.14 Ventilation System as a ventilation exhaust system dedicated to Area 5. It comprises a series of three raise bored shafts with a planned diameter of 5.0 m from surface to 1020 mRL (approximately 1.2km depth) with connecting drives. A 55 m surface pre-sink is required to reach rock suitable for raise boring. A twin exhaust fan will be installed on the surface with ventilation ........

The Renison mine produces a tin concentrate of grade varying between 50-60% Sn with internal process designed to reduce penalty metals such as iron, sulphur, tungsten and copper. The metallurgical process is complex and applies several stages of gravity-type concentration as well as sulphide and oxide flotation, regrinding and acid leach methods. The metallurgical recovery is estimated from plant feed grades and is based on historical plant performance with modifying factors for different ore sources. Metallurgical recoveries on the various ore types and grades were considered as part of the cut-off grade analysis.

The throughput capacity of the Renison processing plant is approximately 1 Mtpa. The ore sorter provides flexibility and additional throughput capacity.

The ongoing Metallurgical Improvement Program is expected to deliver significant ongoing value over the life of mine. Comparing overall recovery (ore sorter and processing plant) at constant ore grade, ........