California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 17 - Mine Safety Orders
Article 35 - Mine Shafts
Section 7114 - (19-110). Deepening an Operating Shaft
Universal Citation: 8 CA Code of Regs 7114
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) No hoisting or other work shall be permitted in the upper part of the shaft while men are in the lower part, unless the men are protected by one or more of the following means:
(1) By leaving a rock pentice at the bottom
of the shaft that is to be deepened. The depth of such pentice shall be not
less than one and one-half times the least dimension of the shaft.
(2) By installing a substantial bulkhead at
the bottom of the shaft to be deepened.
Such bulkhead shall consist of not less than 2 layers of heavy timbers placed with the layers at right angles to each other, and shall be covered with loose rock to a depth of not less than 15 feet.
(b) Any opening through the pentice or bulkhead shall be not larger than is necessary to accommodate the sinking operations, and shall not be located under the hoisting compartments of the shaft being deepened.
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