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Shale is a fine grained sedimentary rock whose original constituents
were clays or muds. It is characterized by thin laminae breaking
with an irregular curving fracture.
Non fissile rocks of similar composition but made of particles
smaller than 1/16 mm are described as mudstones. Rocks with similar
particle sizes but with less clay and therefore grittier are
siltstones.
A slag heap is a pile built of accumulated tailings, which are
by-products of mining. These waste materials are mostly composed of
shale, as well as smaller quantities of carboniferous sandstone and
various other residues.
Trams were daily going from the pit, about eight to twelve trams a
day full of the waste being mined from the washery. An average tram
full of waste would weigh about three tons.
It had been two hours earlier just after 9.15am when a group of
workmen were sent to the top of the big tip that had loomed above
Aberfan for so long. There had been some ominous signs that it was
sinking more than usual.
Aberfan Coal Mines
Slag Heap Shale
Cracks Land Slide
Farm Cottage
Pantglas School
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