Mine: Domtar Mine, Walker, MI
Began → Domatar Mine → Closed
From: Before 1860. Reopened in 1984.
Owned by: Grand Rapids Gypsum Company. Sold around 1999 to Georgia-Pacific which closed the mine.
Owned by R. E. Butterworth, who opened the first gypsum mines north of the Grand River in this area.
Prior to closure, this was the last operating underground gypsum mine in Michigan.