MSHA - Code of Federal Regulations - 30 CFR 33.31
Skip to content
Additional Search Options
Subscribe to E-mail Updates
DEPARTMENT OF LABOR
Mine Safety and Health Administration - MSHA
- Protecting Miners' Safety and Health Since 1978
30 CFR § 33.31
Drilling tests shall be conducted in a test space formed by two curtains suspended across a mine opening in such a manner that the volume of the test space shall be approximately 2,000 cubic feet.
No mechanical ventilation shall be provided in the test space during a drilling test, except such air movement as may be induced by operation of drilling or dust-collecting equipment.
All parts of a unit or system shall be within the test space during a drilling test.
Freedom of Information Act
Privacy & Security Statement
Online Filing Help Desk
U.S. Department of Labor | Mine Safety and Health Administration (MSHA) | 1100 Wilson Boulevard, 21st Floor | Arlington, VA 22209-3939
| Telephone: (202) 693-9400 | Fax-on-demand: (202) 693-9401