The site senior executive for an underground mine must ensure each rope used at the mine has at least the following safety factor—
(a) for a slope haulage rope—8;
(b) for a winder rope, other than a friction winder rope—(i) used for winding persons in a shaft in which persons, materials or minerals may be wound—the safety factor worked out under the following formula—
7.5 – 0.001L
where
"L" is the depth of the wind measured in metres; or(ii) used for winding materials or minerals in a shaft in which persons, materials or minerals may be wound—the safety factor worked out under the following formula—
5.5 – 0.0003L
where
"L" is the depth of the wind measured in metres; or(iii) used for winding machinery at less than 2m/s in a shaft in which persons, materials or minerals may be wound—5; or(iv) used for winding materials or minerals in a shaft in which only materials or minerals may be wound—4.5; or
(c) for a friction winder rope used in a shaft in which persons, materials or minerals may be wound by a single rope—the safety factor worked out under the following formula—
7.5 – 0.001L
where
"L" is the depth of the wind measured in metres;
(d) for a stage rope used in shaft sinking—6.