Diavik Diamond Mine Inc. is a founding member of the Mine Training Society. Several northerners who participate in MTS underground miner program complete their training at the Diavik Diamond Mine and go on to full-time employment at the mine. Diavik, located 300 kilometres northeast of Yellowknife, is an unincorporated joint venture between Diavik Diamond Mines Inc. and Dominion Diamond Mines Ltd. Diavik Diamond Mines Inc., which operates the mine, is a wholly owned subsidiary of Rio Tinto plc of London, England. Currently, Diavik is an all underground mine. In 2014, the joint venture partners approved $US350 million to fund development of the A21 kimberlite pipe. Construction of a rockfill water retention structure, built with the same technology which allowed Diavik to safely and successfully open-pit mine the A154 and A418 ore bodies, is now underway. . Open-pit mining of the A21 kimberlite pipe is expected to begin in 2018. Diavik’s operations training initiatives include numerous site-based training programs, apprenticeships, a site-based workplace learning centre, support for the Aboriginal Leadership Development Program, and many workforce development initiatives. Approximately 1,100 people work at Diavik, of which half are northern. One quarter of Diavik’s workforce is Aboriginal. Diavik’s cumulative northern spend is CDN$4.6 billion, or 72 per cent of its total spending. Total spend with Aboriginal businesses in $2.4 billion. In 2012, Diavik constructed the North’s first last-scale wind farm. This renewable energy facility is reducing the mine’s carbon footprint; it supplies 10 per cent of the mine’s power needs and its diesel fuel offset is approximately five million litres annually. The company’s vision "is to be Canada's premier diamond producer, creating a legacy of responsible safety, environmental, and employee development practice and enduring community benefit."