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Slate mines are found around the world. 90% of Europe's natural slate used for roofing originates from the Slate Industry in Spain. [1] The major slate mining region in the United Kingdom is the Lake district, with Honister slate mine being the last working slate mine, the only producers of the world famous Westmorland greenslate.
The world's biggest consumer of slate is France, followed by the UK, USA and Germany. In 2012, Spain produced more than 580,000 tonnes (570,000 long tons; 640,000 short tons) of slate worth about $380 million. This made it the largest slate producer in the world, followed by China and Brazil. [3]
Slate can be made into roofing slate, a type of roof tile which are installed by a slater. Slate has two lines of breakability—cleavage and grain—which make it possible to split the stone into thin sheets. When broken, slate retains a natural appearance while remaining relatively flat and easy to stack.
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Slate shingles are also called slate tiles, the usual name outside the US. Slate roof shingles are relatively expensive to install but can last 80 to 400 years depending on the quality of the slate used, and how well they are maintained. The material itself deteriorates only slowly, and may be recycled from one building to another.
In 1821, at the end of the initial three years, Holland took a further 21-year lease on the site, but he sold this in 1825 to the Welsh Slate Company which considerably extended the quarry. [3] The Welsh Slate Co.'s undertaking was the lowest on the mountain it became known as Lower Quarry - also known as Lord Palmerston's Quarry.