[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: 30CFR33.37]

[Page 158]
 
                       TITLE 30--MINERAL RESOURCES
 
  CHAPTER I--MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
 
PART 33--DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES--Table of Contents
 
                      Subpart C--Test Requirements
 
Sec. 33.37  Test procedure.

    (a) Roof drilling: Drilling shall be done in friable strata, similar 
to the roof in the Bureau's Experimental Mine, which tends to produce 
large scale-like cuttings.
    (b) Horizontal drilling: Drilling shall be done in strata comparable 
in hardness to that of coal-mine draw slate. Holes shall be started near 
the roof of the test space under conditions simulating the drilling of 
draw slate in coal mining.
    (c) Down drilling: Drilling shall be done in typical mine floor 
strata with a pneumatic percussion-type drill. Five holes shall be 
drilled vertically and five holes shall be drilled at an angle.
    (d) At MSHA's discretion drilling in ``on site'' strata may be 
acceptable in lieu of strata requirements in paragraphs (a), (b), and 
(c) of this section. (See Sec. 33.20(a).)