Ark. Code Ann. § 11-7-308

The owner, agent, or operator shall provide that a bore hole shall be kept twenty feet (20') in advance of the face of each and every working face and at a forty-five degree (45°) angle at intervals of eight feet (8') on each rib of the working face when driving toward an abandoned mine or parts of a mine suspected of containing inflammable gases or of being inundated with water.