They can move to the U.S. and then pay tariffs to import the parts, and have a smaller international demand for the product do to retaliatory tariffs and just straight avoidance of U.S. products while making their product in a higher cost to operate area. OR they can build a mine, pay higher lifting costs, higher wages, produce a much more expensive product of shitty quality to keep the price hopefully low enough that they can still have a demand for the product abroad, but everyone will coorelate their American products as shit because they cut corners to try to keep the costs low enough while having higher expenses. So no one wants their product. Or they could not cut corners and make a great product that costs so much that their market shrinks down to inoperable levels and go out of business.