Operations at a shaft at Aquarius Platinum's Marikana mine in South Africa remain suspended a week after the death of five miners.
Aquarius Platinum commercial director Hulme Scholes said he is unsure when operations will resume, reports Reuters.
South Africa, home to the world's deepest mines, has one of the highest rates of work-related mining deaths in the industrialised world.
The South African Government has ordered mine closures to curb mining accidents, which has further reduced output after the global economic downturn.
In a meeting to discuss and reduce accidents, mining companies and the government agreed to invest in worker training to avoid more disasters and reconvene on a quarterly basis to review progress.
Mining Minister Susan Shabangu said mining accidents in 2010 have dropped by 25% compared to the same period last year.