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, but some issues remain.

The AMCU 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.

A spokesman for Impala said AMCU President Joseph Mathunjwa called Impala's chief executive after speaking with members and said that they had an agreement "in principle" but that there were still some points the workers wanted discussed before the union signs.

An AMCU leader at Anglo American Platinum's mines, Evans Ramokga, said that the union and companies are close to a deal if the companies make a few more concessions.

The companies said they expected to hear back from the union by Friday. But Mr. Ramokga said talks could be delayed until the weekend as union representatives plan to travel to one more platinum-producing region on 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, workers said they wanted changes to the offer before they agreed, including rehiring around 235 workers the company dismissed in May.

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

Impala Platinum said it offered to increase workers' monthly salaries by 1,000 rand ($93) for two years and then 950 rand thereafter.

The companies initially wanted the offer to last for a five-year period. The union wants to change the wage agreement to three years so that it can continue to negotiate to reach 12,500 rand ($1,165) a month, Mr. Ramokga said.

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.

The latest round of talks mediated by South Africa's new minister of mines broke down on Monday without a resolution.

AMCU leaders and the company chief executives have since held private meetings in the last two days to hash out an end to the strike. Mr. 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 broke the strike and went to work were 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.

When 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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