Calculate the barrier pillar that should exist between two mines when the bottom elevation is 1,570 feet and the surface elevation is 1,971 feet with the coal bed being 6 feet, 2 inches in height.

Feet of Cover	=	401 feet
Barrier Pillar	=	10 ft. + (2 x 7 ft.) + (5 x 5 ft.)
	=	49 feet for one side
49 ft. x 2	=	98 ft. total thickness of barrier pillar