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  2. List of quarries in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_quarries_in_the...

    Chile Bar Slate company quarry, off of highway CA193 next to the American River near Placerville, California; Limestone quarry near Auburn, California of the Mountain Quarries Company of San Francisco, a subsidiary of Pacific Portland Cement Company, near confluence of the North Fork and the Middle Fork of the American River.

  3. Buckingham Slate - Wikipedia

    en.wikipedia.org/wiki/Buckingham_Slate

    As of 2019, two companies are active in quarrying and producing the slate from Buckingham County, Virginia: 1) Buckingham Slate Company, which was purchased in 2018 by Boxley Materials, a regional aggregates producer, and, 2) James River Slate Company which established quarry and mill operations in Arvonia in July 2013 and began marketing this ...

  4. Massachusetts Hornfels-Braintree Slate Quarry - Wikipedia

    en.wikipedia.org/wiki/Massachusetts_Hornfels...

    The quarry was located while searching for prehistoric sites near a golf course construction project to the north of the Blue Hills Reservation. [2] The stone found at the quarry is not basaltic in origin, but a heavily metamorphized sedimentary slate known as hornfels, that has a significant amount of silica. This stone had the property of ...

  5. Roofing slates - Wikipedia

    en.wikipedia.org/wiki/Roofing_slates

    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]

  6. Slate industry - Wikipedia

    en.wikipedia.org/wiki/Slate_industry

    The quarrying of slate in Cornwall is known to have been carried out from the late mediaeval period and there was a considerable export trade from some of the quarries near the coasts in the 19th century. Slate has also been quarried at Swithland in Leicestershire. There are considerable workings in Cumbria. During the last 500 years, much ...

  7. Dorothea quarry - Wikipedia

    en.wikipedia.org/wiki/Dorothea_Quarry

    It was the largest quarry in the area, employing 200 men and producing 5,000-6,000 tons of finished slate a year. A group of quarrymen led by John Robinson, William Owen and John Jones purchased Dorothea from Turner for £3,000 - equivalent to £325,276 in 2016.

  8. Collyweston stone slate - Wikipedia

    en.wikipedia.org/wiki/Collyweston_stone_slate

    Collyweston stone slate is a traditional roofing material found in east-central England, primarily in Northamptonshire, Cambridgeshire, Lincolnshire, and Rutland. [ 1 ] Collyweston quarry at Duddington Collyweston roofs on the Round Church, Cambridge

  9. Slate - Wikipedia

    en.wikipedia.org/wiki/Slate

    Slate is a fine-grained, foliated, homogeneous, metamorphic rock derived from an original shale-type sedimentary rock composed of clay or volcanic ash through low ...

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