By  Alex MacDonald and  Devon Maylie

CAPE TOWN, South Africa--The platinum mining industry is in crisis and there is no end in sight to the problem of rising costs and falling demand, leaving little alternative to widespread mine closures, senior executives in the industry said Tuesday.

The warning comes the day after the world's largest producer of the metal, Anglo American Platinum Ltd. (AMS.JO), said it lost $753 million in 2012 and found its plan to restore profitability by shutting loss-making mines obstructed by the South African government, which wants to preserve jobs.

"This is an unsustainable position," said Cynthia Carroll, chief executive of Anglo American PLC (AAL.LN), which has a majority stake in the platinum producer. "We have to restructure the business to make it viable."

South Africa's platinum mining industry accounts for 80% of global supply.

"We have seen several years in which levels of demand for platinum have fallen significantly short of the industry's expectations--in part because of depressed world economies and the consequential downturn in the automotive sector," Ms. Carroll said. Platinum is used mainly in catalytic converters that scrub the exhaust fumes of automobiles.

Demand problems were exacerbated in the second half of last year when thousands of mine workers shut down a swath of the country's mineral production. Mining companies had to increase wages to get workers to return--by as much as 10% in the case of worst-hit Lonmin PLC (LMI.LN).

"Costs have continued to rise relentlessly," Ms. Carroll said. Since the start of 2011, labor costs have risen 8% and the cost of electricity and diesel increased 19%, but the platinum price fell about 3%.

Almost 60% of the South African platinum industry is now either breaking even or making a loss, based on a price for the metal of $1,600 a troy ounce, said Steve Phiri, chief executive of South Africa's Royal Bafokeng Platinum Ltd. (RBP.JO).

Platinum traded at just over $1,700 a troy ounce Tuesday, up 11% since the start of the year. Societe Generale forecasts prices to average $1,688 an ounce this year.

The highest-cost platinum-producing area in South Africa, called the UG2 reef, needs to shut down to return the industry to profitability, said Stuart Murray, the former CEO of Aquarius Platinum Ltd. (AQP.AU). Anglo American Platinum, also known as Amplats, has started some closures, saying last month it would shut four mine shafts and lay off 14,000 workers.

Lonmin shut its K4 shaft last year and has cut back spending. The company doesn't plan to close any more of its mines but will cut management, said acting CEO Simon Scott.

There is some evidence that these plans are already having the desired effect. Platinum climbed to the highest point in almost four months on Monday after Amplats's full-year loss strengthened the case for mine closures.

Demand for platinum for automotive catalysts in Europe is likely to remain flat this year, Johnson Matthey PLC, which makes the products, said last month. However, Mr. Scott said the mine closures mean that by the end of the year, supply of the metal could finally fall below demand.

But Royal Bafokeng's Mr. Phiri said mine closures pose a problem for the South African economy, which counts on the platinum industry for 5.5% of its gross domestic product and about 190,000 jobs.

For this reason, South Africa's government is resisting the plans. It has already pressured Amplats to agree to a detailed consultation process with unions and government before proceeding with its restructuring plan, prompting concerns that mine closures may fall short of targets.

"We need more investment. We can't go back to the past where assets were frozen for 50 years. How we're approaching Amplats is what is best for the company and what is best the country," South Africa's Minister of Mineral Resources Susan Shabangu said Tuesday.

-Laura Clarke and Francesca Freeman contributed to this article.

Write to  Alex MacDonald at  Alex.MacDonald@dowjones.com and  Devon Maylie at Devon.Maylie@dowjones.com

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