Definition of open-pit in English:



  • Denoting a method of mining in which coal or ore is extracted at or from a level near the earth's surface, rather than from shafts; opencast.

    • ‘Chicago-based Oil-Dri Corporation of America, the world's largest producer of cat litter, has been fighting for several years to develop two open-pit clay mines on Bureau of Land Management property ten miles north of downtown Reno.’
    • ‘The Western Shoshone, whose traditional domain covers most of Nevada, are the unhappy hosts to more than three dozen open-pit gold mines on their land, many at least a mile wide and a mile deep, with toxic ponds at the bottom.’
    • ‘The Marquette iron range, which has hosted more than 240 mines since its beginning in 1845, now features only two open-pit taconite mines.’
    • ‘When scientists hunt for dinosaur tracks they look for areas where ancient layers of sedimentary rock are exposed, such as cliffs, sea coasts, quarries, open-pit mines, desert arroyos, and along the banks of rivers and streams.’
    • ‘The Trend's first open-pit mine came in 1965, but it was the steep rise of gold prices in the 1980s and the introduction of cyanide heap-leaching that made mining such low-grade ore profitable.’
    • ‘By adding lands formerly administered by the Bureau of Land Management, the California Desert Protection Act expanded the boundary of Joshua Tree National Park toward the rim of an inactive open-pit iron mine.’
    • ‘The copper and molybdenum open-pit mine started operating in 1957 and is 2 mi. across from east to west and 1.5 mi. across from north to south.’
    • ‘Between 48 and 116 people will be needed for three years to work on open-pit mining, while another 48 people will work for two years in underground mining.’
    • ‘GPS also is being used in another important safety-of-life service: monitoring the stability of landforms such as open-pit mines, the flanks of dormant volcanoes, and areas prone to landslides.’
    • ‘Toronto council votes to send 1.3-million tonnes of garbage to an abandoned open-pit mine near Kirkland Lake in Ontario's north, population 10,000.’
    • ‘This ‘up-scaling’ is generally accommodated easily in open-pit mines, but in underground workings the creation of large caverns brings with it problems of rock mechanics and increased risk of instability.’
    • ‘The firms were part of a large group of mining firms operating in protected forests that froze their operations following the enactment of new forestry legislation in 1999, which banned open-pit mining in those areas.’
    • ‘The firms were part of a large group of mining companies forced to suspend operations following the enactment of a new forestry law in 1999 that banned open-pit mining in protected areas.’
    • ‘It requires no open-pit mines, and the task of keeping the public from seeing the true environmental costs of methane, and what a meager source of energy it is, has gone pretty well so far.’
    • ‘This was very exciting because I knew that if an open-pit mine was developed in this district, tremendous new exposures would be made and wonderful specimens of crystallized gold might begin to appear.’
    • ‘Production peaked here about the turn of the century but continued into the 1970s; after a short lapse it has resumed with open-pit mining of low-grade ores.’
    • ‘The Galactic Mining Company, Vancouver, British Columbia, had secured a permit for a massive expansion of its open-pit mine which would gobble up the quarry.’
    • ‘Additional drilling at the site of the proposed open-pit mine allowed the company to increase its estimates to roughly 26 tons of gold, it said in a statement.’
    • ‘But the construction of the world's largest open-pit mine resulted in the displacement of people as land, including farms, was grabbed from the local population.’
    • ‘In an effort to convert copper rock into quick cash, he tried to open-pit mine the lode to extract ore as fast as possible.’