Robert C. Byrd Mine Safety Protection Act of 2015

[AI summary unavailable — showing source text] Robert C. Byrd Mine Safety Protection Act of 2015 Amends the Federal Mine Safety and Health Act of 1977 to require the Secretary of Labor (Secretary), in conducting health and safety related accident investigations in coal or other mines, to: (1) determine why an accident occurred and whether there were violations of law, mandatory health and safety standards, or other requirements; (2) in cases involving violations of federal criminal law, refer them to the Attorney General; and (3) make recommendations to avoid any recurrence. Requires an independent accident investigation by an independent panel appointed by the Secretary of Health and Human Services for any accident: (1) involving three or more deaths, or (2) whose severity or scale merits an independent investigation. Requires the Director of the National Institute for Occupational Safety and Health (NIOSH), at the request of a majority of the panel or upon his or her own initiative, to issue subpoenas for the attendance and testimony of witnesses and the production of relevant papers, books, and documents, and administer oaths with respect to an investigation. Authorizes: (1) the Secretary's representatives and attorneys to q…