Slate industry - WikipediaThe slate industry is the industry related to the extraction and processing of slate. Slate is either quarried from a slate quarry or reached by tunneling in a slate . In Galicia, the larger slate production companies are concentrated in Valdeorras in.slate mining company in canada,Where is Slate Produced in North America? - Stortz & Son Inc.Oct 30, 2014 . The majority of roofing slate in the United States is quarried in the Northeast region. In Canada, the Glendyne quarry is the largest producing.
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