By Devon Maylie 

JOHANNESBURG--South Africa's platinum producers and the Association of Mineworkers and Construction Union have agreed "in principle" to a wage offer to end a 21-week strike.

The Association of Mineworkers and Construction Union held meetings with its members in the platinum belt on Thursday to present for approval the latest offer from the world's three biggest platinum producers-- Anglo American Platinum Ltd., Impala Platinum Holdings Ltd. and Lonmin PLC.

" 'In principle' undertakings have been reached with the leadership of the Association of Mineworkers and Construction Union," the companies said in a joint statement.

AMCU and its members could come back with amendments before a final agreement is reached, they said, adding that the union will report back to them by Friday.

Speaking to crowds of mine workers in the platinum belt on Thursday, AMCU told its members to choose wisely, and some cheered when they heard the offer. At Lonmin, several workers said they wanted some changes to the offer before they agreed, including rehiring around 235 workers the company dismissed last month.

"I am quietly optimistic," said Johan Theron, a spokesman for Impala Platinum.

The platinum producers have offered to increase workers' monthly salaries by 1,000 rand ($93) each year until their demand of 12,500 rand is reached. Thereafter, salaries will increase by 7.5% a year. The companies also proposed to hold a forum with the union three months after workers return to their jobs to discuss wider structural issues that plague the mine workers, such as poor housing. They also asked for the union to agree to not strike for the next three years.

Some 70,000 miners stopped work on Jan. 23 to demand that the minimum monthly wage be nearly tripled to 12,500 rand a month ($1,165). The latest round of talks mediated by South Africa's new minister of mines broke down on Monday without a resolution.

Since then, AMCU leaders and the company chief executives have held private meetings in the last two days to hash out a new way to end the strike. AMCU President Joseph Mathunjwa said his union would canvass its members on Thursday to get a mandate on what they wanted to do.

The strike has hobbled South Africa's already languishing economy, inflicting more than $2 billion in lost revenue on mining companies and increasing poverty and violence in the communities near the platinum mines. A rival union, the National Union of Mineworkers, said some of its members' property was damaged this week, including cars that were set on fire. Over the past month, the NUM said five people who had been breaking the strike and going to work have been killed around the mines.

Once the strike ends, analysts estimate it will still take at least three months to get the operations back into full production. In addition, the companies said some restructuring is likely, which could lead to job losses.

Once workers return to the mines, Lonmin spokeswoman Sue Vey said there are still a number of issues that companies and the unions will be discussing.

"There are structural issues in the mining sector that still need to be addressed," Ms. Vey said.

Rory Gallivan contributed to this article

Write to Devon Maylie at devon.maylie@wsj.com

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