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The remains of slate quarries lie around the summit of Hill of Tillymorgan. A few small bothies associated with them lie close by. The quarries were established in 18th Century, and continued to operate into the late 19th Century. The slate was found in veins, inclining to north on the top, running generally from east to west, and is in the early to mid-19th Centuries there were 8 quarries in full operation on the hill. Between 2 and 10 men were employed in each quarry as quarriers, splitters, barrowmen and labourers. The best slates were found at a depth of 4.5m to 9.1m. Blue and grey slate was often to be found in the same quarry, occasionally with beds of grey slate between two of blue, although blue is the dominant colour. In the early 19th Century, the average quantity of slates quarried and sold in Tillymorgan was around 300,000, at a price of 50s per thousand (around £215 in today's money).
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