Mich. Comp. Laws § 425.101
There shall be elected at the general election in the year 1968, and at the general election held every fourth year thereafter an inspector of mines for the term of 4 years in any county within this state where there are iron or copper mines situated, some suitable person who is a citizen of this state, who can read and write the English language, and who has had at least 10 years' actual experience in mining, or a person holding the degree of mining engineer, or an equivalent degree, and who shall have practiced his or her profession as a mining engineer for at least 2 years. Inspectors of mines shall not, during their term of office, accept employment or be employed by any mining company or any subsidiary or affiliate thereof. A person elected to any other public office shall not be eligible for election as an inspector of mines, nor for appointment as a deputy inspector.
MCL 425.101