The Penrhyn Slate Quarry is a slate quarry located near Bethesda in north Wales. It is reputed to be the world's largest slate quarry: the main pit is nearly a mile long and 1200 feet deep. Slate Slate is a fine-grained, homogeneous, metamorphic rock composed of clay or volcanic ash which has been metamorphosed (foliated) in layers (bedded deposits). ... A small cinder quarry A dimension stone quarry A quarry is a type of open-pit mine from which rock or minerals are extracted. ... // United States of America Bethesda, Arkansas Bethesda, Delaware Bethesda, Georgia (three places): in Chatham County in Greene County in Gwinnett County Bethesda, Iowa Bethesda, Kentucky Bethesda, Maryland Bethesda, Mississippi Bethesda, North Carolina (two places): in Davidson County in Durham County Bethesda, Ohio Bethesda, Pennsylvania Bethesda, South Carolina Bethesda, Tennessee (two... National motto: Cymru am byth (Welsh: Wales for ever) Waless location relative to the some of the British Isles (other parts of the UK shown on the map are in pink). ... Pit may refer to: Look up Pit on Wiktionary, the free dictionary Any high walled depression in the ground, such as a quarry or (in Britain) a coal mine. ...

The quarry was first developed in 1770 by Richard Pennant, later Baron Penrhyn although it is likely that small-scale slate extraction on the site began considerably earlier. Slates from the quarry were transported to the sea at Port Penrhyn on the narrow gauge Penrhyn Quarry Railway built in 1798, one of the earliest railway lines. Baron is a specific title of nobility or a more generic feudal qualification. ... Narrow-gauge railways are railroads (railways) with track spaced at less than the standard gauge of 4 ft 8 in (1. ... First opened in 1798 as the Llandegai Tramway, became the Penrhyn Railway in 1801. ...

The quarry holds a significant place in the history of the British Labor Movement as the site of two prolonged strikes by workers demanding better pay and safer conditions. The first strike lasted eleven months in 1896. The second began on 22nd. November 1900 and lasted for three years. The labor movement (or labour movement) is a broad term for the development of a collective organization of working people, to campaign in their own interest for better treatment from their employers and political governments. ... 1896 was a leap year starting on Wednesday (see link for calendar). ... 1900 (MCM) is a common year starting on Monday. ...

The quarry still produces slate though at a much reduced capacity from its heyday at the end of the 1800s. It is currently owned and operated by Alfred McAlpine PLC.-1... PLC is an initialism for: Palestinian Legislative Council (law-making body of the Palestinian Authority) Parti Libéral du Canada (the term in French for the Liberal Party of Canada) Partido Liberal Constitucionalista (or Constitutional Liberal Party, a major political party in Nicaragua) phospholipase C Platoon Leaders Class Polish-Lithuanian...