Inquiry procedure and representation at workplace accident inquiries, with summons powers, public mine hearings, and cost recovery provisions. Persons entitled to appear at an inquiry include the enforcement authority, employers' associations or trade unions, injured or affected persons or their representatives, the employer, the person carrying on the work giving rise to the incident, and any other person allowed by the competent person. The competent person may require material witnesses or document holders to attend, regulate procedure at the inquiry, hold mine inquiries in public, direct recovery of inquiry expenses where management negligence is found, and complete and submit the inquiry within three months.