Ask them in today market what would be cut off points where a mine would be doable for them to build.

I would ask them if they plan on building a mine in the next 5 years period .

If so, what is their view on potentially building one in Canada ; lots of labor, cheap equipment, political stability.

This could also be linked to a question where they need to give their view on the prices of metal in the next years (level of optimism, which they should answer positively)