Section 1
SECTION 1. The Secretary of Labor is hereby authorized to promulgate and enforce rules, regulations, and orders to establish safety standards and otherwise to promote and increase the safety of laborers and employees in mines, quarries or metallurgical operations and other industrial enterprises, against danger of injury, or disease: Provided, That whenever, in the opinion of the Secretary of Labor, the enforcement of any rule, regulation, or order may prove detrimental to the normal operation of the enterprises enumerated herein, he may make exemptions which he shall revoke when conditions warrant such revocation.