Section 7958 Of Chapter 1. Tunnels And Mines From California Labor Code >> Division 5. >> Part 9. >> Chapter 1.
7958
. A trained rescue crew of at least five men shall be provided
at underground mines with more than 25 men or tunnels with 10 or more
men underground at any one time. Smaller mines shall have one man
for each 10 men underground who receives annual training in the use
of breathing apparatus. Two trained crews shall be provided at mines
with more than 50 men underground and at tunnels with more than 25
men underground.