It's not easy to answer that, and I'll tell you why. It depends. Certain minerals are obviously required to build certain weapons systems, to build your defence industry, but that might not be where the greatest risk is. The greatest risk is where the bottlenecks are. For instance, a metal like niobium, which Canada does have reserves of but is not yet producing, as far as I recall, is one of those metals that is at the greatest risk of disruption. It's essential, for instance, in the commercial market, for strengthening car bodies. It makes a super steel alloy that makes steel much stronger. It's also essential for building aircraft and other types of vehicles that require very light and very resistant metals.
