MSHA - Code of Federal Regulations - 30 CFR 57.6307
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MSHA - Title 30 CFR
30 CFR § 57.6307
Drill stem loading.

Explosive material shall not be loaded into blastholes with drill stem equipment or other devices that could be extracted while containing explosive material. The use of loading hose, collar sleeves, or collar pipes is permitted.

[58 FR 69596, Dec. 30, 1993]