Shaft pillars shall have sufficient strength to protect operating shafts.
4 Va. Admin. Code § 25-40-2830
Statutory Authority
§§ 45.1-161.3 and 45.1-161.294 of the Code of Virginia.
Shaft pillars shall have sufficient strength to protect operating shafts.
4 Va. Admin. Code § 25-40-2830
Statutory Authority
§§ 45.1-161.3 and 45.1-161.294 of the Code of Virginia.