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pillars in hard rock mining ecavation mining world quarry

Oct 22, 2018 · The unique blend of rhyolites and dolerites at Carn Menyn mine were quarried for the 80 "bluestones" at Stonehenge, 136 miles (220 km) away. Evidence includes a scattering of broken or abandoned pillars of the same size and proportion as those at Stonehenge, and some hammer stones

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