MONITORING GEOTECHNICAL STABILITY AT WASTE DUMP
AND ACID DRANAGE
PRINCIPLE BASIS OF WASTE DUMP MANAGEMENT
INTRODUCTION:
This document provides a summary approach on how we can improve the management of waste
dump to reduce the likelihood of acid drainage forming, mass movement occurrence and ensure
that our infrastructures have acceptable standards and FS greater than or equal to 1, 5.
PREPARATION:
1. During preparation, all vegetation should be removed (bush clearance) and accumulated
out of predefined dumping area.
2. Remove the topsoil (Organic soil and normal soil).
ROCK QUALITY MANAGEMENT:
Type
1
2
3
4
5
Rock
Massive sandstone
Sandstone with small intercalations
Siltstone and claystone
Oxidised or contaminated coal
Weathered overburden
Colour
Light grey
Light grey
Dark grey to black
Black
Light orange or brown
ARD Potential
NAG
NAG
PAF
PAF
NAG
Type 1 and Type 2: should be dumped in the first bench (foundation).
Type 3 and Type 5: should be dumped from second to upper benches (mixed with Type 1 and
Type 2).
Type 4: should be dumped in the middle of second to upper benches.
NB: Keep 0.5% of drainage to conduct rainwater from ramp.
Dozing, leveling all benches and fix safety berms. Bench height should be in accordance with
waste dump plan.
TERMS OF RESPONSABILITY:
I agree with the terms and conditions of waste dump management. Non-compliance with this
information will lead to card remove and assist 1 week of geotechnical training.
BGR Seam InCharge
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ICVL Benga Mine
HOD Technical Services
Geotechnical Engineer
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Technical Services
Rev01