Sisson Mine

Sisson Mine is a proposed open-pit tungsten and molybdenum mine which would be sited near the town of Stanley, 60 km North-West of Fredericton, New Brunswick, Canada. The project is being developed by Northcliff Resources Ltd., which holds an 88.5% controlling interest, with the remaining 11.5% owned by Todd Minerals Ltd., a subsidiary of the Todd Corporation of New Zealand. The mine would be among the world's largest tungsten mines, with reserves equating to 227 kilotonnes of elemental tungsten (W). The claim owner, Sisson Mines Ltd., proposes to mine 30,000 tonnes per day of ore which contains on average 0.06 per cent tungsten trioxide (WO3) and smaller amounts of molybdenum. The tungsten component of the ore would be refined into an intermediate product ammonium paratungstate (APT) for shipment. Five hundred fifty seven thousand metric ton units (mtu) of APT would be produced per year, which equates to 4,457 tonnes of tungsten metal per year. The mine would generate large quantities of potentially acid-generating tailings. To minimise acid production and leaching of toxins, including arsenic, from the tailings and waste rock the operator proposes to submerge the tailings and waste rock in a large tailings storage facility (TSF - or "tailings pond"). The pond would be about 3½ by 2½ km in horizontal extent, with a maximum dam height of 90 metres; the stored volume would compr

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