By Rhiannon Hoyle 
 

SYDNEY--Energy Resources of Australia Ltd. (ERA.AU) said its output of uranium oxide dropped 20% in the second quarter, citing a planned shutdown of its processing mill for maintenance.

The company, controlled by Rio Tinto PLC (RIO), said it produced 390 metric tons of uranium oxide from its stockpiles in the three months through June, compared with 489 million tons the quarter immediately prior.

ERA stopped mining uranium at its Ranger deposit in Australia's Northern Territory in late 2012 after its ore was depleted, and has since been processing stockpiled ore.

Last month, ERA announced it would shelve its next proposed development, the Ranger 3 Deeps project, amid a prolonged downturn in the global uranium market.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com

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