This is to decide whether to continue a week-long wildcat stoppage, the National Union of Mineworkers (NUM) said.
About 5,000 NUM members stopped work last Tuesday at the company's Zondereinde mine, its biggest operation, demanding the removal of chief executive Paul Dunne over what they say are unfair hiring and firing practices.
The union said a draft memorandum had been developed by both sides after marathon talks on Monday.
(READ MORE: Northam reports no change in situation at Zondereinde)
"The memorandum will be presented to workers at a mass meeting at 10h00 (0800 GMT)," the NUM said in a statement.
[DATA NHM:Northam] shut operations at the mine, which produces 65 per cent of its output, on Friday due to what it called rising levels of intimidation against non-striking workers and assaults related to the stoppage. The mine produces about 900 to 1,000 ounces of platinum group metals per day.