Coaltech Research Association

Causes, Symptoms, Prevention and Alleviation of Soil Compaction on Mined Land

Norman F.G. Rethman

A review of South African opencast coal experience, written for environmental officers and mine management who must correct legacy compaction and plan operations that avoid creating more.

What this report found

Compaction on rehabilitated opencast land restricts effective rooting depth so severely that only a small proportion of arable and grazing areas reach their stated capability. The review sets out the causes and symptoms, argues that symptoms are usually treated without addressing the cause, and recommends site specific, resource based management, mechanisation choices weighed against compaction, and land capability standards aligned with international codes.

R1500,00

Description

Related Products

Grant van Heerden

Development of Design Procedures for Long Slender Pillars

2005

Design guidance for rib pillars, built from back analysed in situ coal tests and two dimensional modelling rather than empirical data, for rock engineers laying out high extraction panels.

What this report foundNumerical modelling produced upper and lower bound strength formulae for rib pillars, the lower bound covering weak roof and floor contacts.

R1500,00

R1500,00

What this report found

Numerical modelling produced upper and lower bound strength formulae for rib pillars, the lower bound covering weak roof and floor contacts. The formulae apply between width to height ratios of 0.5 and 2.5, with linear interpolation below that, and give conservative designs above 3. Adjustments were suggested where regular joint sets occur.

FGX Dry Processing Tests Conducted at Exxaro R&D

GJ de Korte

2009

Pilot tests of a waterless de-stoning unit on raw coals from four South African collieries at a Pretoria research site, for plant metallurgists weighing dry beneficiation.

What this report foundA compound dry cleaning machine de-stoned low grade raw coal without using water, but separation efficiency was low, with high relative density cut points and...

R1500,00

R1500,00

GJ de Korte

200931 pages

What this report found

A compound dry cleaning machine de-stoned low grade raw coal without using water, but separation efficiency was low, with high relative density cut points and EPM values in the order of 0.3. Misplaced material was heavy and coal below 6 mm reported to product almost indiscriminately. The unit is cheap to buy and run, needs only crushing to 50 mm, and gives high throughput.

Institutional, Legal & Financial Aspects of Regional Mine Water Collection, Treatment and Re-use

2004

Review of ownership models, licensing and funding for a shared regional mine water treatment scheme on the Mpumalanga coalfields, written for mine managers and water regulators.

What this report foundA regional scheme to collect, treat and re-use mine water in the Upper Olifants River Catchment has merit, with the mines best placed to start it through a...

R1500,00

R1500,00

What this report found

A regional scheme to collect, treat and re-use mine water in the Upper Olifants River Catchment has merit, with the mines best placed to start it through a dedicated mine water company that brings in the water services authorities. Water legislation supports the scheme provided the regulator allocates mine water as a resource. Viability rests on the tariffs mines and water users pay.

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