Spotlight on American Rare Earths, page-4712

Both a future Harris administration and a future Trump Administration seem to have accepted tariffs as a part of US minerals policy. If either presidential administration wants to use tariffs to increase US mineral production, the most effective tariff policy would impose tariff rates that maximize reserve extraction and target refining self-sufficiency in the United States. Importantly, the US government should use tariff rate quotas and phase in the tariffs to moderate the price shocks on downstream US firms, allowing time for them to adapt their supply chains and for upstream mineral companies to expand existing US mines and refineries and to develop new US mines and refineries. This draft tariff policy—especially when combined with streamlined permitting, grants for mineral exploration, and concessional loans for mine development, expansion, and refining facilities—would help increase US mineral production. QUOTE
ARR place in the US market will benefit in the future IMO

https://www.mining.com/web/us-policy-to-increase-mineral-production-must-include-revisiting-tariffs/