290.020. It is hereby declared to be unlawful for anyperson, company or corporation engaged in carrying on any kind ofmining, mechanical, chemical manufacturing or smelting business,to work their employees in any mill or mills, or plants, whileengaged in crushing rocks and mine products, containing mineralor ores, or engaged in separating the minerals or ores from rockand such combination with which the mineral or ores are mixed, orreducing or roasting, or refining or smelting minerals or ores,from and after the time such rocks, or combination of rocks andmine products, or minerals or ores are taken out of the mines, atsuch labor or industry, for a period of time longer than eighthours in a day of twenty-four hours, without their consent, andit is hereby declared that eight hours shall constitute a day ofemployment, for all laborers, or employees, engaged in the kindof labor or industry aforesaid.
(RSMo 1939 § 10167, A.L. 1981 H.B. 748)Prior revisions: 1929 § 13206; 1919 § 6767; 1909 § 7813