DescriptionAmCyc Blasting - Stoping.jpg	English: Woodcut/drawing illustrating a method a forming steps in rock blasting called stoping. Several steps are shown schematically.
Date	1879
Source	The American Cyclopædia, v. 2, 1879, p. 700 (Fig. 4).
Author	Unknown authorUnknown author
Permission (Reusing this file)	Public domainPublic domainfalsefalse This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:AmCyc_Blasting_-_Stoping.jpg

Caption: When the tunnel is of sufficient height it is usual to drive the heading (H) forward beneath the crown, and to follow with one or more benches (B and B'). The work is always driven against the perpendicular faces of the headings and benches, and in the direction of the axis of the tunnel; but the lamination of the rock may be such as to make it preferable to drill the holes in the upper surface of a bench, as at b, and throw the rock horizontally from the face, instead of commencing at b' and throwing it downward.