CRAZY - SEND MESSAGE TO OTTAWA DST DON'TYellowknives Dene First Nation PO Box 2514 Yellowknife, NT, Canada X1A 2P8 Dettah Administration Office Chief Drygeese Bldg. Community of Dettah Phone: 867-873-4307 Fax: 867-873-5969 Giant Mine in Yellowknife, NT is one of Canadas most contaminated places, and will cost at least $900 million dollars to remediate Theres 237,000 tonnes of arsenic trioxide stored underground, says environmental advocate Kevin OReilly. Theres probably enough arsenic trioxide underground to kill every person on the planet a couple times over. The pollution buried underneath Giant Mine is perilously close to downtown Yellowknife and a vital marine ecosystem. OReilly says if the creek running through the property floods it will have devastating impacts on the environment and the health of people who live in the area.