China's outbound shipments of rare earths in May jumped 23% on the month to their highest in a year, though Beijing's export curbs on some of the critical minerals halted some overseas sales, with shortages rippling through global manufacturing.

Chinese exports of rare earths, a group of 17 minerals at the center of a trade dispute with Washington, rose 23% in May from the previous month, according to customs data on Monday.

Beijing has approved more export licenses for the critical minerals and magnets in recent days, but supplies remain scarce and factories in the West are running out.