China sharply curtailed exports of two key critical minerals in June, with outbound shipments of antimony falling by 88% and germanium by 95% compared to January levels, Asia Financial reported on Monday, noting that the drop reflects Beijing’s intensifying crackdown on transshipment and unauthorized export activity after discovering that material was being routed through third countries such as Thailand and Mexico. The measures come amid escalating geopolitical competition over supply chains for strategic metals used in semiconductors,…