Ohio Revised Code Title XV. Conservation of Natural Resources § 1567.23

No employee, worker, or miner shall have in the employee's, worker's, or miner's possession inside of an underground mine more than one twenty-five pound keg or box of blasting powder or other explosives. Every person who has powder or other explosives in an underground mine shall keep the same in a wooden box suitable to contain the original container of such explosive. Such box shall be kept at all times at least twenty-five feet from the track and electric wire, no two of such boxes shall be kept within twenty-five feet of each other, nor shall blasting powder and high explosives be kept in the same box, and in no case shall detonating caps be kept in a box with blasting powder or high explosives.

Where systems of mining are such that it is impracticable to comply with the first paragraph of this section, those requirements may be modified in writing by the chief of the division of mineral resources management, upon the request of the owner, lessee, or agent of such mine. No operator shall maintain or have a magazine for the storage of blasting powder or high explosives, including detonating caps, in the underground workings of any mine, except with the written permission of the chief.

No employee or operator of a mine shall refuse or neglect to comply with this section.