Wow this administration is f**ing batshit insane. I thought the tariffs would be on raw metals, not anything at all that happens to contain them.
For example, the US has some of the largest lithium deposits in the world, but it's not being exploited because extraction is dirty and polluting, generally the compliance for opening a new mine is very complex (takes 7-10 years), and catching-up on refinery capacity will take an enormous investment (China does almost all Li refining now).
Similarly, developing the techniques to boost oil extraction (fracking, EOR...) took significant and sustained government support of different kinds until it became competitive, it's unclear if market pressure alone would have done it. This made the US again into the largest exporter rather than the largest importer of oil.
There are many such cases.
Note: I'm not from the US, and I'm not particularly pro-US, I'm not saying that tariffs are a good mechanism to support these industries, and I'm not necessarily in favour of such anti-environmental policies. But those are the facts as I understand them.
If the US has a ton of Lithium but finds it too expensive to extract, why not buy it now while it's cheap, wait for it to become rarer in other countries so more expensive, and only extract it once it's worth it (or close to worth it)?