Mineral Fork is a stream in Washington County, Missouri. It is a tributary of the Big River.
The source which is the confluence of the Mine a Breton Creek and the Fourche a Renault is located at 38°01′44″N 90°51′12″W / 38.02889°N 90.85333°W and the confluence with Big River is at: 38°06′09″N 90°40′53″W / 38.10250°N 90.68139°WCoordinates: 38°06′09″N 90°40′53″W / 38.10250°N 90.68139°W.