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The Slatington Slate Trade report for January 4 of 1880 showed that quarries in the town of Slatington alone had shipped 81,402 squares of roofing slates (over 8 million square feet) as well as 40,486 cases of school slates and 243 cases of blackboards. The Slate Valley (the district of Granville, New York) is well known
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 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.
Archaic period double-notched butterfly bannerstone from Ohio, ca. 2000 BC.Made of banded slate, a material frequently used in bannerstone manufacture.Bannerstones were used in North America for some 3,000 years beginning in the fourth millennium BC. [1]
Slate is a fine-grained, metamorphic rock that shows no obvious compositional layering but can easily be split into thin slabs and plates. [2] [3] It is usually formed by low-grade regional metamorphism of mudrock.
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Often 19 mm slabs will be laminated at the edge to create the appearance of a thicker edge profile. The slabs are cut to fit the top of the kitchen or bathroom cabinet, by measuring, templating or digital templating. Countertop slabs are commonly sawn from rough blocks of stone by reciprocating gangsaws using steel shot as abrasive.
Later in 1887 the company was involved in the important legal case Levy vs Abercorris Slate and Slab Co (1887) 37 Ch D 260 over the legal meaning of a debenture. [3] A reconstituted Abercorris Slate & Slab Quarry Company was begun in June 1890, again led by J.W. Orchard, [1] and it re-opened the quarry with 40 men employed. [2]