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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. Massachusetts Hornfels-Braintree Slate Quarry - Wikipedia

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

    The Massachusetts Hornfels-Braintree Slate Quarry is a prehistoric archaeological site [2] in Milton and Quincy, Massachusetts.It consists of a series of pits and trenches used from 5,000 B.C. until the early 17th century as a source of slate and hornfels used for chipped and ground tools.

  4. Virginia Slate - Wikipedia

    en.wikipedia.org/wiki/Virginia_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 ...

  5. Slate Belt - Wikipedia

    en.wikipedia.org/wiki/Slate_Belt

    Jones founded Bangor, Pennsylvania and established several slate quarries. The industry continued to expand throughout the 19th century, reaching its peak production in 1903. [5] At its 19th century peak, the Slate Belt was the world's largest slate-producing region despite its relatively small geographic size, which is 22 square miles. [6]

  6. Bwlch y Slaters quarry - Wikipedia

    en.wikipedia.org/wiki/Bwlch_y_Slaters_quarry

    Bwlch y Slaters quarry was a small affair, which started as open workings near the summit of Manod Mawr in the 1780s. [1] Its early history is a little sketchy, but John Pritchard took a lease on the quarry for seven years in May 1824.

  7. Penrhyn quarry - Wikipedia

    en.wikipedia.org/wiki/Penrhyn_Quarry

    The Penrhyn quarry is a slate quarry located near Bethesda, North Wales. At the end of the nineteenth century it was the world's largest slate quarry; the main pit is nearly 1 mile (1.6 km) long and 1,200 feet (370 metres) deep, and it was worked by nearly 3,000 quarrymen. It has since been superseded in size by slate quarries in China, Spain ...