California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 17 - Mine Safety Orders
Article 32 - Gases in Mines
UNDERGROUND
Section 7103 - (21-1). Gassy Mine Classification
Universal Citation: 8 CA Code of Regs 7103
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) A mine shall be deemed gassy, and thereafter operated as a gassy mine, if:
(1)
(21-1b) Flammable gas emanating from the orebody or the strata surrounding the
orebody has been ignited in the mine; or
(2) (21-1c) A concentration of 0.25 percent
or more, by air analysis, of flammable gas emanating only from the orebody or
the strata surrounding the orebody has been detected not less than 12 inches
from the back, face, or ribs in any open workings; or
(3) (21-1d) The mine is connected to a gassy
mine; or
(4) (21-1a) The Division
may designate any mine as gassy if history or past experience indicates that
flammable gas in hazardous concentrations is likely to be encountered in such
mine.
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