The fire first started on the former Hatfeld Colliery spoil heap, near Kirton Lane in Stainforth, on Thursday.
Firefighters worked to extinguish the blaze on Thursday afternoon.
The fire has now reignited and two appliances have been sent to the scene as crews attempt to get the blaze under control.
A South Yorkshire Fire and Rescue spokesman said: "Two fire engines are at a grassland fire near Kirton Lane in Stainforth, Doncaster.
"There is a lot of smoke in the area so firefighters are advising local residents to keep their doors and windows closed."