A news release obtained by The Canadian Press says the Widows Pension Act would ensure the women get full retroactive benefits.
The document says legislation was changed in 1999 so that remarried women would continue to receive their survivors' benefits, retroactive to the date when they remarried.
However, benefits for women who remarried before 1985 were only retroactive to 1999.
The news release credits Betty Baumann of Glace Bay, whose husband died in a coal mine in 1960, for leading a group of widows who fought for the change.
The government says most of the compensation will come from the Workers' Compensation Board's accident fund, which covers workers injured on the job.
Self-insured employers, such as the provincial government, would be responsible for their portion of the cost.