* Union demanding 15 pct wage rise, Northam offers 8 pct
* Exxaro, NUM negotiators not yet agreed pay deal
* Strike to cost Northam 9 million rand per day
(Recast with losses, adds details, shares, analyst)
By Shapi Shacinda
JOHANNESBURG, Sept 6 (Reuters) - Northam Platinum said on Monday it would lose 1,000 ounces in daily output of Platinum Group Metals (PGMs) after the majority of its workers went on a wage strike, the latest to hit South Africa.
Northam, one of South Africa's smaller platinum miners, said 80 percent of its 6,800 employees at the Zondereinde mine started the strike on Sunday, shutting the entire operation.
South Africa, the continent's biggest economy, has been hit by a wave of strikes and strike threats in both the private and public sectors, which have led to above-inflation settlements and stoked fears that the cost of living will rise.
The Northam workers, members of the National Union of Mineworkers (NUM), are demanding a 15 percent wage rise after rejecting an offer of an 8 percent pay increase in a two-year deal.
South Africa's inflation rate slowed to a four-year low of 3.7 percent in July.
Northam produced 321,475 ounces of PGMs in the year to end-June.
"At current rand basket price levels, revenue losses are estimated to be 9 million rand ($1.25 million) per day," the company said in a statement.
An analyst at Vestact, Sasha Naryshkine, said the production losses could prompt Northam to seek a quick end to the strike.
"They will probably settle in the middle pretty soon, because it is better to be producing than not to produce at all," Naryshkine said.
The NUM says it represents over 8,000 miners out of Northam's 8,600 total workforce. Northam said the difference between the union's and its own figures was made up of contract workers.
NUM spokesman Lesiba Seshoka said the union would continue to press for higher pay demands.
"Unless we find a resolution, there will be no end to this strike," Seshoka said.
Seshoka said new wage negotiations at diversified miner Exxaro had continued on Monday but there was no agreement yet.
Workers at Exxaro's mineral sands operations have been on a wage strike since Aug. 23 after rejecting an 8 percent wage increase. The NUM is demanding a 14 percent pay rise.
Northam shares were up 1.16 percent at 43.50 rand at 1427 GMT, compared with a 0.2 percent fall in the JSE's All-share index. (Editing by Matthew Tostevin and Jane Baird)