W. Va. Code § 22A-3-2: Clay mine foreman; when to be employed; qualifications; assistants.

In every underground clay mine where five or more persons are employed in a period of twenty-four hours, the operator shall employ a mine foreman who shall be a competent and practical person holding a certificate of competence for said position issued to him or her by the Office of Miners' Health, Safety and Ttraining after an examination by such office. In order to receive a certificate of competence qualifying a foreman in an underground clay mine, the applicant shall take an examination prescribed by the Director of the Office of Miners' Health, Safety and Training, be a citizen of this state, of good moral character and temperate habits, having had at least three years' experience in the underground working of clay mines.