[Code of Federal Regulations]
[Title 30, Volume 1]
[Revised as of July 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 30CFR77]

[Page 669]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 77_MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK 
AREAS OF UNDERGROUND COAL MINES--Table of Contents
 
                    Subpart T_Slope and Shaft Sinking
 
Sec.  77.1904  Communications between slope and shaft bottoms and hoist 
operators.

    (a) Two independent means of signaling shall be provided between the 
hoistman and all points in a slope or shaft where men are required to 
work. At least one of these means shall be audible to the hoistman. 
Signal codes used in any communication system shall be posted 
conspicuously at each slope and shaft.
    (b) Signaling systems used for communication between slopes and 
shafts and the hoistman shall be tested daily.