Show strip mining Is on increase increasing importance of strip coal maning on the colorado plateau is illustrated by a report from the steamboat springs area of the tons mined last year by the big three companies there tons of it was ob obtained tain through strip mining although trip strip mining has only been employed in the area for about five years the edna coal company led the field in 1954 with tons mined almost completely by that method one of the coal companies near neighboring hayden is even mining a vertical vein using the open pit method it is believed to be the only mine of this type west of the mississippi |