The Asia Miner

JAN-MAR 2019

The ASIA Miner - Reporting Important Issues to Mining Companies in the Asia Pacific Region

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the asia miner • volume 16 • issue 1 28 WASTE TO ENERGY In the Philippines' volaঞle mining sector, OceanaGold appears to be hiমng the mark and winning points at its Didipio Mine operaঞons. As reported by the local Philippines media, the fast-growing populaঞon in the upland mining village of Didipio in Kasibu town, Nueva Vizcaya, has prompted OceanaGold to provide it with a P37-million water system. The natural spring water is the main source of the community's drinking water as outlined in OceanaGold's 2017 Mine Rehabilitaঞon Fund Commiee report, Water Resource Study for Barangay Didipio. With this, OceanaGold, which operates the Didipio Mine, is working with the community for the construcঞon of the P37-million Didipio Water System Project (DWSP) due for compleঞon in 2019. According to OceanaGold, the DWSP will include water storage, treatment and supply infrastructure that would provide the community with safe, potable water; with the system capable of providing water for up to 11,000 individuals or about 2,400 households. While the nature of the mined ore at Didipio allows for extracঞon using grinding and flotaঞon processes with water, OceanaGold has reported not using cyanide or mercury for gold and copper recovery. The mine tailings generated from the processing plant are stored at the tailings storage facility (TSF) while the water from the TSF is further processed in the water treatment plant, which is an automated facility. He said that using a flocculaঞon and coagulaঞon process, the water storage plant significantly reduces total suspended solids to 70 parts per million (ppm), well below the government standard for Class D water at 150 ppm. A purpose-built paste-backfill plant, where approximately 30 to 40 per cent of the mine tailings are mixed with OceanaGold launches P37-M water project at Didipio cement and used as backfill material for the underground voids, which reduces the volume of tailings delivered to the TSF, was also constructed. Didipio's TSF is constructed to standards that exceed Philippine guidelines and meet Internaঞonal Commission on Large Dams (Icold) guidelines, and the Category High C Australia Naঞonal Commiee on Large Dams (Ancold) guidelines. The Didipio Mine also minimises the use of freshwater resources by recycling process water. In 2018, the Didipio Mine successfully commissioned the Didipio Water Recycling and Purificaঞon Plant, which treats sewage water. OGPI environment manager Jason Magdaong said the AWT facility at Didipio was built to further improve water discharge quality. "Our technology involves the recycling of process tailings water, contribuঞng significantly to the

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