Safety officer qualifications in mines require scaled appointments, category-specific competency certificates, and recognised industrial safety experience. At every mine where one hundred or more workers are ordinarily employed, the employer must appoint safety officers on a prescribed staffing scale, with one officer for up to five hundred workers and one additional officer for every further five hundred workers or part thereof. The rule prescribes specific qualifications for safety officers in coal mines, metalliferous mines, and oil mines, including category-wise competency certificates, recognised engineering or industrial safety qualifications, and, for oil mines, five years' experience in management or supervision of operations.