Technique

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Every section of rock has its own character, and experience and common sense will help determine the most effective method of dealing with it. Take time to carefully evaluate the rock's structure. Consider whether the rock is solid or 'seamy', stratified horizontally or vertically, or is igneous, sedimentary, or metamorphic before deciding where and how to attack it. Work with, not against, the rock.

The importance of properly planning the hole in advance, that is, deciding where and how deep to place it, cannot be overemphasized. Rock usually splits to the first horizontal seam below the drill bit or tip of the wedge. Proper placement will help assure that the rock will break at the proper angle and in the right place while using the least time and energy. Using the shortest steel necessary will also save time and energy.

Courtesy of the University of Montana Mansfield Library Archives.