The union, Lonmin, Amplats and Implats have agreed to a R1,000 basic salary annual increase for three years.
Mining companies have offered a R1,000 pay hike per year, but Harmony is only offering R500.
The union insists it did not walk out of negotiations, but simply declared a deadlock.
Negotiations with Harmony Gold, Anglo Gold Ashanti, Sibyane, Village Main Reef & Evander will begin soon.
The latest victim was outside a bottle store when a group of armed men opened fire on him.
Amcu has made fresh calls for the killings on the platinum belt to stop and for officers to act swiftly.
Miners may not sit in on proceedings and their lawyer has threatened to walk out.
Platinum producers have denied they gave an undertaking to Amcu to refrain from restructuring.
The top three platinum companies have collectively lost over R20bn during the work stoppage.
All parties involved in the labour dispute are expected to sign the agreement this afternoon.
Amcu has planned a mass meeting with workers in Rustenburg this afternoon.
The mineral resources minister will soon meet with the ANC's subcommittee to discuss the economy.
Striking Amcu members are demanding a basic R12,000 monthly salary.
Both Amplats and Implats said they are reviewing the contents of the written response.
Miners gave Amcu's leadership a mandate to accept a R1,000 salary hike.
The SA Attorneys Association says the effects of the platinum strike on the economy are concerning.
Ngoako Ramatlhodi said the living out allowance demanded by Amcu is in addition to the R12,500 salary.
Solidarity says the right to strike has become more important than the right to work.
