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Quarry - WikipediaA quarry is a place from which dimension stone, rock, construction aggregate, riprap, sand, gravel, or slate has been excavated from the ground. A quarry is the same thing as an open-pit mine from which minerals are extracted. The only non-trivial difference between the two is that open-pit mines that produce building.boral clarence sand quarry coal surface mining,boral clarence sand quarry coal surface mining,Quarrying Explained - Institute of QuarryingQuarries principally produce sand and gravel and crushed rock for construction and these materials are usually described as' aggregates'. The principal minerals extracted by underground mining in the UK are gypsum, salt and potash. In addition, quarries produce substantial quantities of coal, chemical grade line,.NSW - MiningLink - The largest & most visited mining website in .The Airly underground black coal mine in the Hunter Valley Region of New South Wales has been placed on care and maintenance by Centennial Coal Company . The Berrima cement works in the New South Wales Southern Highlands, that is owned by Boral, supply's over 60 percent of the state's cement requirements.