For the purpose of examination of candidates for such certificate, a board of examiners shall be appointed in each of the inspection districts provided for by this act. The said board shall consist of the district inspector of mines, two practical miners and one engineer, operator, or superintendent of a mine. The said inspector shall act ex officio and the said boards shall be appointed by the courts of common pleas of the county in which the inspection districts are located. The said boards shall act as such for the period of one year from the date of their appointment. Meetings of the board may be held at any time and they may make such rules and conduct such examinations as in their judgment may seem proper for the purpose of such examinations. The said board shall report their action to the Secretary of the Department of Mines and Mineral Industries,¹ and at least three of the members thereof shall certify to the qualification of each candidate who has passed such examination.