Fall of Ground Strategy Trigger Action Response Plan

Fall of Ground Strategy Trigger Action Response Plan as Tool for prevention of Fall of Ground Incidents Wednesday, September 8, 2021 Obed Tsetsewa

Technology • Technology is the making, modification, usage, applied activity or behaviour, and knowledge of tools, machines, techniques, crafts, systems or methods of organization in order to solve a problem or improve a pre-existing solution to a problem. It can also refer to the collection of such tools, machinery, modifications, arrangements and procedures Wikipedia • 2

CONTENTS • Fall Of Ground Incidents • Major Hazard Management Plan (MHMP) • Trigger Action Response plan (TARP) • Available technologies

TRIFR TRENDS How do we compare to previous years? • 90 • 9 0 • 80 • 70 • 5 9 • 60 • 4 9 • 50 • TRI • 4 0 • 40 • TRIFR • 3 8 • Fatals • 2 8 • 30 • 20 • 13, 6 5 • 10 • 2 0 • 1 9 • 8, 7 • 6, 2 8 • 5 • 4, 1 5 • 2, 1 1 • 1 2 • 3, 6 • 3, 8 6 3 • 4, 9 6 • 0 • 2005 • 2006 • 2007 • 2008 • 2009 • 2010 • 2011 • 2012 • 5

FALL OF GROUND INCIDENTS • History: – 10 fatalities since 1998 – 2005 - 2 FOG incidents involving 4 fatalities – High severity incidents – FOG top major hazard

ACCIDENT STATS 2 FOG Injuries per million tons

Major Hazard Management Plans • Wednesday, September 8, 2021

MAJOR HAZARDS • Identified 7 Major Hazards within our operations: • (those hazards we know will cause fatalities on the mine) 1. Falls of Ground 2. Trackless Mobile Machines 3. Conveyor Belts 4. Electricity and Isolation 5. Ventilation 6. Winches and Rigging 7. Track bound Machinery

MAJOR HAZARD MANAGEMENT PLAN (MHMP) • Inter-departmental effort MHMP • Team Leader for each MHMP • Champion for each site • Leading indicators • Monthly audits of MHMP by Site Champions • FOG Data base kept by Team Leader • Annual audits by Team Leader • ICAM investigations done on all incidents relating to MHMP

KEY LEARNINGS • Should not be an additional procedure. • Should pull the key controls together into a single document. • Must be regularly audited to give assurance of the current controls. • Must produce leading indicators (triggers). • Must assign responsibility for everyone involved in the MHMP. • Must establish a rigid structure of reporting/communication for each site.

FALLS OF GROUND: key controls Reporting • – Hazard/Q-Rating and GPR (Actual vs. Planned) – Planned Task Observations (Actual vs. Planned) – % substandard support and of pillars robbed in a section. – Panels stopped by TARP (High Risk Panels) – Fall of Ground Register – Controlled and uncontrolled falls of ground – Frequency of falls and Fall out sizes – Fall out thickness Review • – Review of the risk assessment every 6 months – MHMP key controls reviewed once a year or after incidents by review committee.

Trigger Action Response Plan (TARP) • Wednesday, September 8, 2021

WHY WAS TARP INTRODUCED? • Multiple fatalities at Maloma colliery. • Fatality at Kroondal Mine. • A serious injury at Helena Mine. • Several near misses.

DEVELOPMENT OF THE TARP SYSTEM • Involvement of Experienced Mining Personnel and Strata control Experts. • Standardizing Geotechnical and Geological Terminology. • Involve the training department at all phases • Development of learning materials i. e. Training( VRT)

T. A. R. P. - Overview 1. System devised to dictate a level of response to underground conditions. 2. Ground conditions will determine the task team required. 3. Strategy to minimize rock falls and part of MHMP for ground control. 4. Three rating conditions used: Normal - Green Level 1 - Yellow Level 2 - Red Risk Based approach and escalates the decision making hierarchy

LEVELS OF RESPONSE TO TARP

TARP FIELD CARD

TARP RED TRIGGERS

TARP RATING IN PRACTICE FAULT WEDGE DOME PANEL BARRICADED AND RATED TARP RED BY MINER

TARP SYSTEM: Closing the loop

Available Technologies • Wednesday, September 8, 2021

Available technology: Virtual Reality Training

IN CASE A WRONG ANSWER IS CHOSEN

TARP: Key fundamentals • The system must be simple and robust. • The system must be adequately resourced both in terms of personnel, technology and equipment. • The focus of TARP should be on prevention and control through early detection. • Setting triggers requires detailed knowledge of what is normal. • TARP need to be regularly reviewed and revised as necessary and experience dictates. • David Cliff-Tips, Tricks and Pitfalls • 33

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