Auger holes shall not extend closer than 500 feet (measured horizontally) to any abandoned or active underground mine workings, except as approved in accordance with Section 460:20-43-28 of these Regulations.
Okla. Admin. Code § 460:20-47-7
Auger holes shall not extend closer than 500 feet (measured horizontally) to any abandoned or active underground mine workings, except as approved in accordance with Section 460:20-43-28 of these Regulations.
Okla. Admin. Code § 460:20-47-7