25 C.F.R. § 213.35 Mines to be timbered properly.
Title 25 - Indians
In mining operations the lessee shall keep the mine well and sufficiently timbered at all points where necessary, in accordance with good mining practice, and in such manner as may be necessary to the proper preservation of the property leased and safety of workmen.
Title 25: Indians
PART 213—LEASING OF RESTRICTED LANDS OF MEMBERS OF FIVE CIVILIZED TRIBES, OKLAHOMA, FOR MINING
Operations
§ 213.35 Mines to be timbered properly.

