--Nymex July platinum recently trades up $7.30, or 0.5%, at $1,517.90 a troy ounce

--Platinum miners at Lonmin in South Africa vote for strike, union boss wants more talks

--Gold steady after ECB meeting, traders cautious ahead of Friday's US jobs data

 
   By Matt Day 
 

NEW YORK--Platinum futures hit a five-week high on Thursday as union workers at a South African mine voted to strike, the latest threat to supply from the top producer of the metal.

The most actively traded platinum contract, for July delivery, recently traded up $7.30, or 0.5%, at $1,517.90 a troy ounce on the New York Mercantile Exchange. Futures rose as high as $1,523 an ounce, the highest since April 29.

Members of the Association of Mineworkers and Construction Union this week voted to go on strike at platinum producer Lonmin PLC (LMI.LN), but the union's president has asked members for more time to negotiate with the company's management.

"We want to avoid a strike," AMCU president Joseph Mathunjwa said.

AMCU members say they're frustrated with the union recognition process at the mine after the group recently beat out a rival union for members. Union officials at AMCU and rival National Union of Mineworkers have been shot and killed in recent weeks.

Even if AMCU is able to convince its members to avoid another strike now, the mining sector faces the possibility of more industrial action as gold and coal producers begin negotiations for a new two-year wage agreement this month. Wage talks are normally accompanied by strikes as part of the negotiating process to demand higher wage increases.

South Africa accounts for about three quarters of global platinum output.

A brief strike was held at Impala Platinum Holdings Ltd. (IMPUY) on Tuesday, and workers at chrome mines owned by Glencore Xstrata PLC (GLEN.LN) remain on strike.

Gold was little changed after European Central Bank chief Mario Draghi didn't outline a course change to monetary policy in a press conference following the bank's policy meeting.

Gold trading activity has been muted this week, with some in the market reluctant to place large bets ahead of Friday's closely watched reading on the U.S. labor market. Prices have been pressured for much of this year by the view that an improving U.S. economy would spur the Federal Reserve to throttle back its easy-money policies.

Gold for August delivery, the most actively traded contract, was recently unchanged at $1,398.50 a troy ounce on the Comex division of the Nymex.

"Gold is just having a hard time putting any distance between itself and $1,400," said Matt Zeman, a market strategist with Kingsview Financial.

-Devon Maylie and Tatyana Shumsky contributed to this article.

-Write to Matt Day at matt.day@dowjones.com

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