The Angas Zinc Mine is located on the Fleurieu Peninsula in South Australia, 2km from the town of Strathalbyn, 60km from the state’s capital city Adelaide, and 70km from the sea port of Port Adelaide.
The mine was placed in care and maintenance in late 2013 as a result of a prolonged drop in metal prices and the current economic reserve being depleted. In order to preserve capital infrastructure the majority of underground fixed plant was removed and stored on surface. Approximately 93% of the mined voids have been filled as part of the stoping sequence, but the decline and level drives remain open as access to remaining resources in the event of future reopening of the mine. After treating all available ore, the processing plant has been decommissioned and is being maintained in a ready condition for restarting in the short term. All underground pumps have been removed to allow groundwater levels to recharge and prevent AMD.
The Angas Zinc Mine has an existing Indicated and Inferred Resource of 1,200,000 at 5.8% Zinc and Lead which is located adjacent to existing mine workings. There is potential for additional near mine resources through exploration on the mining lease
The mine is an underground operation with decline access utilizing an Open Stoping mining method. A 400,000 tpa polymetalic float plant was used to process ore, producing zinc and lead-copper-silver-gold concentrates. Tailings are deposited in a lined tailings storage facility. The mining operations stopped in October 2013 and the site is being maintenance with the plan to reopen the facility. As part of the Mining Lease requirements, Terramin is working with the Department of State Development to finalise the updated PEPR, incorporating the Mine Closure Plan and the design for a Phytocap Cover System for the tailings storage facility.
Meanwhile Terramin is reviewing options for reopening with the strengthening zinc price and investigating the feasibility of utilising the Angas processing and tailings facilities for the treatment of high-grade gold ore from the Bird-in-Hand Project, approximately 35 km to the north. Terramin has renewed the original Extractive Mineral Licence 5325 for 7 years. This allows Terramin to undertake the extraction, processing and potential sale of construction sand and other quarry products from the site.