With the us dollar strength, construction gets cheaper and cheaper.

No way Teck buys out Copper Fox. Copper Fox may sell but that isn't happening until Teck decides to move the project forward. Copper Fox would have to discount thier value too much to sell under the current circumstances. It costs Copper Fox nothing to wait and let Teck add value to the property, even to the point of arranging financing for construction. If Copper Fox does nothing they eventually end up with thier share of a producing mine. That is not a bad thing either.