Gases and vapours that can be a hazard in the work environment outside of the operator enclosure are excluded from this document.

This document adopts a limit states design philosophy.

Typical underground structures covered by this document include, but are not limited to:

—    box front structures at the bottom of rock passes;

—    conveyor gantry and transfer structures;

—    chairlift support structures;

—    crusher support structures;

—    fan support structures;

—    fixed or retractable arresting structures for ramps (see ISO 19426-5);

—    foundations for pumps, fans, winches and underground winders;

—    high-pressure bulkheads;

—    monorails;

—    overhead crane gantries for workshops, pump stations and sub shaft winder chambers;

—    settler structures;

—    silo bulkhead structures;

—    silo structures;

—    structures supporting loose rock;

—    tip structures, including dump structures;

—    underground head frames;

—    ventilation control doors and other ventilation structures;

—    walls and floors for safety bays, refuge stations and sub-stations;

—    water control doors;

—    water retaining structures.

This document does not cover matters of operational safety or layout of the underground structures.