Mining›SWMS

Open Pit Bench Management SWMS

Open pit bench management addresses the geotechnical hazards associated with pit wall stability, bench design, crest management, and edge protection in surface mining operations. Bench collapse and highwall failure can cause multiple fatalities and destroy equipment valued in the millions. Edge protection using safety berms is the primary control preventing vehicles from driving over bench edges, and berm maintenance is a continuous obligation as mining operations advance and benches are reshaped. Geotechnical monitoring of pit wall movements provides early warning of instability that allows evacuation before failure occurs. This SWMS covers bench design compliance, edge protection, geotechnical monitoring, and crest management.

Legal Requirements

regulation

WHS Regulation 2025; State mining legislation — geotechnical management plans required

hrcw category

Surface mining, work at height, geotechnical hazard management

code of practice

Prevention of Falls at Workplaces; Managing Risks of Plant in the Workplace (binding July 2026)

section 26a binding

Yes — Both codes binding July 2026. State geotechnical requirements apply additionally.

Hazards

Hazard	Consequence	Likelihood
Bench collapse or highwall failure causing burial of personnel and equipment	Multiple fatalities, catastrophic equipment loss	Unlikely
Vehicle rollover from bench edge due to berm failure or absence	Operator fatality, vehicle destruction	Possible
Rockfall from bench faces onto personnel and equipment on lower benches	Fatal struck-by injuries, equipment damage	Possible
Pedestrian fall from bench crests and unprotected edges	Fatal falls from multi-storey heights	Possible
Crest failure during drill rig or excavator operation near bench edge	Equipment loss into pit, operator fatality	Unlikely

Controls (Hierarchy of Controls)

Design pit benches to geotechnically approved dimensions for each geological domain

Maintain safety berms at minimum half-wheel height along all bench crests and dump edges

Install geotechnical monitoring systems — prisms, radar, or satellite — on critical pit walls

Implement trigger action response plan for geotechnical monitoring exceedances

Restrict personnel access to bench faces with active rockfall hazards

Inspect bench crests and berms daily and following blasting events

Establish exclusion zones below active bench faces where rockfall may reach lower benches

Recent Prosecutions

Pit wall failure — surface mine NSW$410,000

A significant pit wall failure displaced 50,000 tonnes of material onto the pit floor. Two haul trucks were destroyed but operators escaped injury. The mine had no prism monitoring on the failed wall section and geotechnical reviews had identified the instability risk six months earlier without remedial action.

2023 — NSW Resources Regulator Prosecution Database

What Your SWMS Must Include

✓Bench design parameters for each geotechnical domain including angle, height, and width specifications

✓Berm construction and maintenance standard specifying minimum dimensions and inspection frequency

✓Geotechnical monitoring system specifications and alarm trigger levels

✓Trigger action response plan for pit wall movement exceedances with defined evacuation procedures

✓Crest management procedure specifying minimum set-back distances for equipment near bench edges

Need a compliant Open Pit Bench Management SWMS?

Our geotechnical consultants develop bench management SWMS with pit wall monitoring designs, TARP frameworks, and edge protection standards.