Employment of minors between 16 and 18 years of age is permitted in quarries but such minors shall be prohibited from engaging in any of the following occupations in quarries:
- (1) Drilling, shot firing or assisting in loading or tamping holes.
- (2) Face cleaning.
- (3) Attaching blocks to chains for cable hoisting.
- (4) Operating or assisting in operating steam, air or electric shovels, or in any other occupation prohibited by section 5 of the act (43 P. S. § 46).