By Stephen Bell 
 

PERTH, Australia--Tugboat workers at Australia's biggest iron-ore port have voted to take industrial action, including work stoppages, raising the prospect of disruptions to exports of the steelmaking ingredient by BHP Billiton Ltd. (BHP) and several other mining companies.

Maritime Union of Australia deckhands in Port Hedland backed the move--the latest in the 12-month dispute--after failing to negotiate new pay and conditions with Teekay Shipping, a contractor that runs tugboats on behalf of BHP and the other port exporters, the MUA said in a statement Thursday.

Members endorsed an unlimited number of two-hour and four-hour stop-work meetings and unlimited work stoppages of 6 hours and 12 hours, the MUA said.

Industrial action was considered a last resort, but workers were frustrated that negotiations were not progressing, said Will Tracey, MUA Assistant Secretary of the Western Australia state branch.

Write to Stephen Bell at stephen.bell@wsj.com

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