The first thing you need is a job-offer from a company that can get an LMIA and bring you to work in Canada. Most big mining operations recruit from Internet so there is no harm in sending in your Cv and persuading them that you are the man for the job. Try Newgold at Rainy River or if you are adventurous: Baffinland at Mary River. That one is iron ore from the north of Baffin Island in the Arctic Circle. Good luck.