I work for an underground mining company. Do I have to work longer than eight hours a day? July 28, 2021 22:00 Missouri law states it is unlawful for any operator engaged in mining or prospecting for minerals to work any employee longer than eight hours in a 24 hour time period without his/her consent. Related articles What types of mining operations does the state of Missouri inspect? Why is there a protest period for unemployment claims? General Information How do I make my weekly request for payment?