There shall be a written and an oral examination of applicants as may be prescribed by the rules of the Mining Board; and all written examination papers and all others papers of applicants shall be kept on file by the Mining Board for not less than 6 months, during which time any applicant shall have the right to inspect his said papers at all reasonable times; and any applicant shall be entitled to a certified copy of any or all of his said papers upon payment of a reasonable copy fee therefor.