South African mining unions have asked their members to consider the latest wage offer from the Chamber of Mines, as the the nation's largest gold mining strike in 18 years continues.

Officials with the National Union of Mineworkers say the new offer includes wage increases of between six and seven percent - an improvement from the original offer of four to five percent.

At least 110,000 workers have taken part in the strike. Officials estimate the action is costing South Africa's gold producers about $20 million a day.

Some information for this report provided by AFP and Reuters.