Search results
Results from the WOW.Com Content Network
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-grade, regional metamorphism. It is the finest-grained foliated metamorphic rock. [ 1 ]
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 was freed from the rockface by blasting in shot holes hammered (and later drilled) into the rock. Slate mines were usually worked in chambers which followed the slate vein, connected via a series of horizontal "Floors" (or "Levels"). The chambers varied in size between mines and were divided by "pillars" or walls which supported the roof.
Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!
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 ...
Yorkstone is a tight grained, Carboniferous sedimentary rock. The stone consists of quartz, mica, feldspar, clay and iron oxides. The ratio of quartz to mica varies considerably. The stone can be split along mica-rich layers: it has a slaty cleavage and may therefore be called sandstone slate. [2]
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 ...
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.