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нефтегазовая промышленность
комбинированный способ ударного и роторного бурения с обратной промывкой (США)
строительное дело
буровой раствор
нефтегазовая промышленность
промывочная жидкость
нефтегазовая промышленность
буровой раствор
промывочная жидкость
The Mesabi Iron Range is a mining district in northeastern Minnesota following an elongate trend containing large deposits of iron ore. It is the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. First described in 1866, it is the chief iron ore mining district in the United States. The district is located largely in Itasca and Saint Louis counties. It has been extensively worked since 1892, and has seen a transition from high-grade direct shipping ores through gravity concentrates to the current industry exclusively producing iron ore (taconite) pellets. Production has been dominantly controlled by vertically integrated steelmakers since 1901, and therefore is dictated largely by US ironmaking capacity and demand.