-- Aquarius Platinum puts Everest mine "on care and maintenance"

-- Move comes just weeks after company halted Marikana mine

-- Producer under pressure from low metal prices

-- Analysts say more platinum mine closures needed to influence price

(Adds details and context throughout.)

By Devon Maylie and Rhiannon Hoyle

SYDNEY--Aquarius Platinum Ltd. (AQP.AU) halted its second mine in a month Thursday, on account of low prices, a signal that miners of the precious metal will continue to struggle to remain profitable amid weakening demand and rising costs.

The move to place South Africa's Everest mine "on care and maintenance" from close of business Thursday comes less than two weeks after Aquarius stopped operations at its Marikana mine, jointly run with Anglo American Platinum Ltd. (AMS.JO), citing sustained weak platinum group metal prices.

"[Platinum] prices in both rand and U.S. dollar terms are likely to remain stagnant for some time, and margins will remain under severe pressure across the industry," Aquarius said in a statement.

Analysts at JP Morgan said larger platinum mines would have to close to influence the price of the metal, which is scarcer and more expensive to extract than gold and traditionally trades at a higher price. But weak industrial demand--platinum is primarily used in cars to clean emissions--and worries that the euro-zone debt crisis will sap global growth, have pressured platinum below the price of gold and below the cost of production for a growing segment of the industry.

Adding to demand concerns, Aquarius said the South African sector--the world's largest producer of platinum--is being hit by costs that are up more than the rate of domestic inflation, and increased labor disruptions that are causing output losses.

That isn't good news for the South African economy, which partly relies on mining exports and is projected to grow slower than last year.

South Africa's mining sector contracted 16.8% in the first three months of 2012 due to worker strikes at platinum mines, safety stoppages at gold mines and slower demand from Asia, the country's reserve bank said. The sector dragged down overall gross domestic product growth by 0.9% on the quarter.

Many platinum miners face a dismal outlook. The largest producer, Anglo American Platinum Ltd. (AMS.JO), has already cut capital spending plans at its South African mines, saying it wants to prioritize less capital-intensive projects in the near term given pricing volatility and escalating costs. Its parent, Anglo American PLC (AAL.LN), is reviewing its operations and could sell or halt of some of its unprofitable mines.

Eastern Platinum Ltd. (ELR.T), said recently it was suspending some work at its South African mines and reviewing its spending.

"Aquarius now has two of its seven mines operating, but crucially we estimate the residual company is now cash break-even, something none of its competitors Lonmin PLC (LMI.LN), Northam Platinum (NHM.JO), Impala or Amplats can boast," said Liberum Capital analyst Dominic O'Kane in a note.

The spot price of platinum Thursday traded around $1,456 a troy ounce, down 16% from its 2012 high of $1,734/oz recorded in February.

Metals consultancy Thomson Reuters GFMS estimates that the platinum market will be over-supplied by 735,000 ounces this year, while Johnson Matthey said the 2012 surplus will be similar to last year's--which was 430,000 ounces.

At 1126 GMT, Aquarius shares were trading down 10.69% at 7.10 rand.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com and Devon Maylie at devon.maylie@dowjones.com

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