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Geology can do funny Toby White
University of Leeds
things! Dept. Mining, Quarry &
Mineral Engineering…read more

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Toby White
Subsidence University of Leeds
Dept. Mining, Quarry &
Mineral Engineering
Introduction
Subsidence only occurs where the ground material
can be displaced into some sort of underground
void. Only occur in certain types of rocks.
Collapse of material overlying the void where the roof
is cannot support the mass of material above.
The voids can be of two types:
Macrovoids
Large cavities such as solution caves in limestones and
occasionally salt, or mined cavities in rocks of economic
value (coal, salt, metal mines, etc.)
Microvoids
In very porous deformable rocks (clay, peat, silts & sands)
We will only cover subsidence due to mining.…read more

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Toby White
Subsidence University of Leeds
Dept. Mining, Quarry &
Mineral Engineering
Room & Pillar (Pillar& Stall)…read more

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Toby White
Subsidence University of Leeds
Dept. Mining, Quarry &
Mineral Engineering
Room & Pillar (Pillar& Stall)…read more

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Toby White
Subsidence University of Leeds
Dept. Mining, Quarry &
Mineral Engineering
Longwall Mining - Shearing
Roof supports
Coal shearer
Coal
Roof collapses
(goaf) behind Coal carried away
supports. on conveyor…read more

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