* Says committed to all of Anglo's commodity business
* Rounds on "thugs and murderers" behind mine unrest
* Says platinum must pay its way
* South African gold miners may strike this weekend (Recasts with additional quotes from speech)
By Ed Stoddard
JOHANNESBURG, Aug 29 (Reuters) - Anglo American remains committed to its South African platinum mining business if it pays its way but violence in the country's mines must stop, the group's new chief executive said on Thursday.
Anglo American Platinum, the world's largest producer of the precious metal, made a loss last year because of low prices and strikes in the country, which sits on four fifths of the world's known platinum reserves.
The company has been trying to hammer out a restructuring plan for the business but fierce government and union resistance led it to rein in plans for 14,000 job cuts to just under 7,000. The company will give a further update on the process on Friday.
Asked whether Anglo American was committed to staying in South African platinum, CEO Mark Cutifani told Reuters: "Yes we are ... as we are for all of our commodities. But if they don't deliver, they won't stay in the portfolio. Nothing is sacrosanct."
The nation's mining sector was rocked last year by violent wildcat strikes rooted in a union turf war that killed dozens of people, cost billion of dollars in lost output and triggered credit downgrades for Africa's largest economy.
That conflict saw the Association of Mineworkers and Construction Union (AMCU), accused by critics of using intimidation - which it denies - poach tens of thousands of members from the National Union of Mineworkers (NUM) on the platinum belt, where tit-for-tat killings continue.
In prepared remarks delivered at the end of a mining conference in Johannesburg, an emotional Cutifani - who stunned the audience as he paused and held back sobs at one point - rounded on criminal elements he said were behind the violence.
"We cannot allow thugs and murderers to intimidate ordinary and law-abiding citizens in their individual quest for power and subversion," Cutifani said.
"It is time for all of us to stand together and just say no. Just say no to physical threats and abuse. Just say no to intimidation. Just say no to violence against people and property," he said to applause from the audience.
More strikes in the gold sector could begin this weekend as a militant and restive workforce seeks pay hikes of up to 150 percent, which the companies say they can ill afford.
Cutifani told Reuters before his speech that investors were "sick" of the bad news coming out of South Africa, a trend that had destroyed the value of mining shares in the resource-rich country.
"Investors have South African fatigue. If you look at the series of bad news stories that have come out of South Africa since 2011 it really has weighed on share prices," said Cutifani, who is also the president of South Africa's chamber of mines.
"The mining index has underperformed the Johannesburg All-share index. We've destroyed value. Whether it's London, whether it's New York, whether it's Timbuktu, they're all sick of the bad news coming out of South Africa," he said.
Since the start of 2011, Johannesburg's mining index has shed 18 percent against a gain of 32 percent on the All-share index, which has scaled a series of record highs this year. Anglo American Platinum shares have tumbled 40 percent in the same period.
Cutifani knows South African mining well, having been the chief executive of Johannesburg-based AngloGold Ashanti - which is not part of the Anglo stable - before assuming his new position at the London-listed global mining company.
He said about 50 percent of South Africa's gold and platinum shafts were "underwater" at current prices and he feared a new round of stoppages would hit jobs in a country with an unemployment rate of over 25 percent.
The chamber of mines negotiates on behalf of the gold producers which include AngloGold, Harmony Gold and Gold Fields.
"If we do end up going into strikes, I do fear for jobs and shafts," Cutifani said.
With wage talks deadlocked, more strikes seem likely.
The National Union of Mineworkers (NUM) will give gold producers on Friday 48-hours' notice of its members' intention to strike over deadlocked wage talks, a source with direct knowledge of the matter said on Wednesday.
"I hope we are able to salvage something at the 11th hour," Cutifani said. (Additional reporting by David Dolan; editing by Andrew Roche)