Provided that in the case of contiguous leases held by the same person or corporation, the Governor may, on cause being shown, allow any two or more of the said leases to be regarded as one for the purpose of calculating the expenditure required by this regulation. [Sidenote: Deposit of tailings and waste matter.] 20. In any case where tailings or any other products whatever from the operations of mining or metallurgy are being discharged, or about to be discharged, in such a manner as to hinder or injuriously affect any other person in the execution of his legal mining rights, or the future development of mining, it shall be lawful for the Government Inspector of Mines to order the disposal of such products or tailings in some other manner not detrimental to present or future mining. [Sidenote: Explosives.] 21. It shall not be lawful for any person to construct underground any magazine for the storage of explosives, or to erect a magazine for such purpose upon the surface of the ground without previously having obtained permission in writing from the Government Inspector of Mines. Any such magazine shall be erected subject to the following conditions:— (_a_) It shall be constructed at a distance of at least 100 yards from any occupied building, public road, bridge, aqueduct, or railway, or structure that might sustain damage in the event of an explosion; (_b_) The walls shall be of suitable and substantial construction; (_c_) The roof shall be as light as possible, but fire-proof; (_d_) It shall be provided with a reliable lightning conductor, which shall have its lower end attached to a metal plate at least four square feet in area which shall be buried at least three feet in the ground, and the point at which the conductor enters the ground, and the ground in which it is buried, shall be as far as possible kept damp; (_e_) It shall have no windows; (_f_) The door shall be provided with a stout lock and be kept fastened when not in use; (_g_) The ground within a radius of sixty yards shall be kept clear of bushes and grass. [Sidenote: Monthly reports to Government.] 22. On or before the 8th of each month, or as soon after as circumstances will permit, every manager or person in charge of mining operations shall lodge with the Government Inspector of Mines a written statement setting forth:— (1) The name and designation of the property; (2) The name of the owners of the mine; (3) The nature of the mine; (4) The output of mineral in the preceding month; (5) A statement of working costs; (6) The number of employees and labourers in the preceding month, and the total amount of wages paid to the labourers and the total amount of salaries of Europeans that are a charge on the mine, including those on leave; (7) The particulars of any deaths or accidents that may have occurred during the preceding month; and