[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR57.3000]

[Page 319]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 57--SAFETY AND HEALTH STANDARDS--UNDERGROUND METAL AND NONMETAL MINES--Table of Contents
 
                        Subpart B--Ground Control
 
Sec. 57.3000  Definitions.

    Authority: 30 U.S.C. 811.

    Source: 51 FR 36198, Oct. 8, 1986, unless otherwise noted.


    The following definitions apply in this subpart.
    Rock burst. A sudden and violent failure of overstressed rock 
resulting in the instantaneous release of large amounts of accumulated 
energy. Rock burst does not include a burst resulting from pressurized 
mine gases.
    Rock fixture. Any tensioned or nontensioned device or material 
inserted into the ground to strengthen or support the ground.
    Travelway. A passage, walk, or haulageway regularly used or 
designated for persons to go from one place to another.

              Scaling and Support--Surface and Underground