§ 57.22241. Advance face boreholes (I-C mines).
77 words·~1 min read·
/us/cfr/t30/s§ 57.22241·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
(a)Boreholes shall be drilled at least 25 feet in advance of a face whenever the work place is within---
(1)50 feet of a surveyed abandoned mine or abandoned workings which cannot be inspected; or
(2)200 feet of an unsurveyed abandoned mine or abandoned workings which cannot be inspected.
(b)Boreholes shall be drilled in such a manner to insure that the advancing face will not accidently break into an abandoned mine or abandoned working.