The Arcadia plant took nine months to construct and started exporting concentrates in April.

China on Monday announced export restrictions on some gallium and germanium products, citing national security interests.

China said on Monday it will impose export restrictions on gallium and germanium.

The Earth-i global dispersion index fell to 45.9 in June from 46.2 in May.

The move underscores the dilemma facing President Xi Jinping as he seeks to counter US efforts to prevent China from accessing the chips needed to dominate technology.

The LME index of base metals has sunk from a January high of 4,356 to 3,704.

China said the control on exports of gallium and germanium products from Aug. 1 was aimed at protecting national security.