Sisson Mine
proposed mine in Stanley, New Brunswick, Canada
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 comprise 23 million cubic metres of contaminated water, 282 million tonnes of tailings, and 193 million tonnes of waste rock.
There is local concern about the environmental impact of the mine and tailings storage facility.
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This entry incorporates text from “Sisson Mine” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.