Stock prices for Thompson Creek Metals have been falling since late February this year.
Share prices have gone from $9-10 per share to less than $3 as of last week.
Problems at both their Endako operation and their U.S. molybdenum operation have reportedly increased production costs.
The Mount Milligan mine being built between Fort St. James and Mackenzie is still slated to become operational by the third quarter of 2013.