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open, or surface, excavation of rock used for various purposes, including construction, ornamentation, road building, and as an industrial raw material. Rock that has been quarried is commonly called stone. Quarrying methods depend chiefly on the desired size and shape of the stone and its physical characteristics. For industrial use (e.g., limestone for preparing cement), as the aggregate in concrete, or for road beds, the rock is shattered. Explosives are detonated in a series of holes drilled in the rock in a pattern designed to yield the greatest amount of fracturing. The rock fragments may be further reduced in crushing machines and sorted according to size by screening. For building stone, rocks that do not shatter are separated by blasting; for softer rocks or when explosives cannot be used (e.g., because they would disturb adjacent workings), a process known as broaching, or channeling, is used. In this process a line of holes is drilled perpendicular to the joints or cleavage planes of a formation; wedges are inserted into the holes and hammered until the stone splits off. This method was probably used in ancient times, notably by the Incas and the Egyptians. Much quarrying of ornamental stone today is done by using pneumatically operated channelers. After the vertical cuts have been made, gadding machines (working on the same principle) are used to make horizontal cuts. Wedges are then used to split off the long blocks, which are subdivided and removed. Wire saws are also used; these consist of several pulleys over which passes an endless steel wire. Holes are drilled in the rock, each hole being made large enough to accommodate a pulley and the shaft to which it is attached. The wire, extending from one pulley to another, presses down against the rock between them. As the cut is deepened by the constantly moving wire the pulleys are continuously lowered into the holes.
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The surface exploitation and removal of stone or mineral deposits from the earth's crust.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


The process of extracting stone for commercial use from natural rock deposits. The industry has two major branches: a dimension-stone branch, involving preparation of blocks of various sizes and shapes for use as building stone, monumental stone, paving stone, curbing, and flagging; and a crushed-stone branch, involving preparation of crushed and broken stone for use as a basic construction, chemical, and metallurgical raw material.

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"But the environmental impact of quarrying can be horrendous for wildlife, fauna, and local residents.
To recall, Cimatu stopped all quarrying operations in Rizal province after residents of Marikina blamed the overflowing of the already silted Marikina River to the environmental degradation brought about by unhampered quarrying operations.
Quarrying activities in the country comprises extractive activities for building materials such as limestone for cement manufacturing, as well as gravel and sand, known as aggregates.
She also said mining and quarrying activities within forest reservations would leave irreversible damage.
But is the quarrying industry really poised for a comeback?
The light brown block stone was previously obtained from the company's Clock Face Quarry located approximately 1.5km north of Moselden Height Quarry, b y utthe quarrying operations there ceased several years ago.
It is important to bear in mind, of course, that slate quarrying has not been confined to the history books.
World Wildlife Fund (EWS-WWF UAE) researcher Christophe Tourenq, based in Fujairah said quarrying was an unnecessary pressure on the eco-system.
"These quarrying operations are now coming to an end requiring the quarry to be restored," they added.
In a privilege speech, the district 3 lawmaker blamed the Umalis for the poor revenue collections from quarrying operations against the high tax collections of quarrying operations in Pampanga.
'Quarrying in Mayon danger zone suspended' !-- --Celso Amo (The Philippine Star) - February 9, 2018 - 12:00am LEGAZPI CITY, Philippines Quarrying within Mayon Volcano's danger zone has been stopped, according to the environment and natural resources office (ENRO) of Albay."We have suspended quarrying in high-risk areas," Tess Atos, ENRO officer-in-charge, said yesterday, referring to the eight-kilometer-radius zone around the volcano.
Rock quarrying is one of the common but most dangerous industries to work in relative to other industries globally.