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Representative portion of each sample of concentrates, middlings and tails was treated with aqua regia and other acid mixture and the solutions were analyzed for Au, Ag and base metals (Cu, Zn, Pb, Cr, Ni, Co, Mn and Cd) by atomic absorption spectrometer in the geochemistry laboratory of NCE in Geology, University of Peshawar.
In July, Yakutugol's Nerungrinskaya prep plant washed 783,000 metric tons (mt) of coking coal and produced 536,000 mt of concentrate and 197,000 mt of middlings.
With that production volume, the saleable production at Elga is expected to be more than 8 million mt of high-quality coking coal concentrate, some 5 million mt of steam coal concentrate from oxidized coal, and about 6 million mt of middlings.
Dairy producers can substitute wheat middlings for some of the higher-cost feed ingredients in rations for early-lactation cows.
Wheat middlings are a by-product of milling wheat for flour and pasta.
In an age of unlimited business liability, the middling sort had learned the importance of caution and moderation, neither of which characterized the well-publicized excesses of the fashionable world.
This study is based on a national survey of middling personal papers, the periodical press, and popular literature produced by and for the middle classes spanning the long eighteenth century.