Cone crushers, which are bestsuited for medium to very hard materials, are advantageous for industries, including metallurgical, for the processing of large aggregates supplied by metal mining such as iron and copper ore; road building, for the reduction of building materials such as asphalt and concrete; and chemical, for the reduction of minerals used in chemical processing such as
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A crusher bucket is an attachment for hydraulic excavators. Its way of working consists on a bucket with two crushing jaws inside, one of them is fixed and the other one moves back and forth relative to it, as in a jaw crusher. They are manufactured with a high inertia power train, circular jaw movement and an antiestagnation plate, which prevents large shredding pieces from getting stuck in the bucket's mouth, not allowing them to enter the crushing jaws. They have also the crushing jaws placed in a cross position. This position together with its circular motion gives these crusher buckets the faculty of grinding wet material
Bronze Age gold objects are plentiful, especially in Ireland and Spain, and there are several well known possible sources. Romans used hydraulic mining methods, such as hushing and ground sluicing on a large scale to extract gold from extensive alluvial (loose sediment) deposits, such as those at Las Medulas. Mining was under the control of the state but the mines may have been leased to civilian contractors some time later. The gold served as the primary medium of exchange within the empire, and was an important motive in the Roman invasion of Britain by Claudius in the first century AD, although there is only one known Roman gold mine at Dolaucothi in west Wales. Gold was a prime motivation for the campaign in Dacia when the Romans invaded Transylvania in what is now modern Romania in the second century AD. The legions were led by the emperor Trajan, and their exploits are shown on Trajan's Column in Rome and the several reproductions of the column elsewhere (such as the Victoria and Albert Museum in London). Under the Eastern Roman Empire Emperor Justinian's rule, gold was mined in the Balkans, Anatolia, Armenia, Egypt, and Nubia.
Mining remains an important economic sector for many countries in the Eastern Europe, Caucasus and Central Asia (EECCA) region. At the same time, EECCA countries are adopting strategies to promote green growth. They aim simultaneously to improve livelihoods, while decoupling economic growth from destructive environmental practices. Determining the role of government policies in rationalising green growth strategies with the extractive sector, and improving the environmental performance of mining operations, are critical challenges
Another underground miner at NFCA, who worked with Konkola Copper Mines (KCM) until he was laid off during the 2008 global economic crisis, said that some of the areas underground where we work would be off limits in other companies due to poor ventilation. We can feel the lung problems already, even though our friends in other mines have been working for much longer. We know were at risk for health problems because of the conditions here.
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