By Rhiannon Hoyle 
 

SYDNEY--BHP Billiton Ltd. (BHP.AU) will pare back its workforce linked to the Olympic Dam copper, uranium and gold mine in South Australia state as it confronts a downturn in global commodity markets.

The world's biggest mining company by market value will cut roughly 140 jobs, largely from its office in South Australia's capital Adelaide, a person familiar with the matter said.

In an emailed statement, BHP said the job cuts followed a review of the operation, including labor productivity. The miner had already made 90 employees redundant in January.

"At Olympic Dam, we continue to simplify our business to ensure we are operating as efficiently as possible," BHP said. "This is consistent with the work being done in other BHP Billiton operations, and across the resources sector, and reflects the challenging external environment."

BHP said the review of its operations was continuing.

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

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