Md. Code, Environment § 15–303

(a) An applicant for a first-class mine foreman certificate of competence shall produce evidence satisfactory to the examining authority that he is at least 18 years of age and a citizen of the State or of another state that accords similar privileges to a citizen of Maryland. He shall furnish a verified history of his experience in mining employment, showing in detail the several mines in which he has worked, their location, the particular occupation followed during a period of at least five years, and in particular his knowledge of and extent of experience with gaseous mines. Each applicant shall pay an examination fee of $5 to the State.

(b) An applicant for a “permit of competence” shall produce evidence satisfactory to the examining authority that he is qualified by experience to take the examination for the permit.

(c) An applicant for a fire-boss certificate of competence shall produce evidence satisfactory to the examining authority that he is a resident of the State, or of another state that accords similar privileges to a resident of Maryland, and at least 18 years of age. He shall furnish a verified history of his experience in mining employment, showing in detail the several mines in which he has worked, their location, the particular employment followed during a period of at least 3 years, and, in particular, his knowledge of and extent of experience with gaseous mines. Each applicant shall pay an examination fee of $3 to the State.