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coal found in sedimentary rock, is crushed into the appropriate size and used as fuel for electricity generation or the iron-making process. lumps of coal can be used directly as a fuel. however some coal is first washed to make it into high grade coal. It can also be sorted into various sizes, depending on what the fuel is required for.apr 16, 2019 rocker box uses less water than a sluice box and is suitable for areas with limited water. rocking motion provides the movement of water needed to separate gold in placer material from gravity. hard rock mining. hard rock gold mining extracts gold in rock instead of fragments in loose sediment, producing most of the gold in the world.the gold is smelted in an electric furnace to produce gold bars of purity. filtration & zinc precipitation carbon-in-pulp & electro-winning flux is added and the gold is melted in a furnace to separate the gold from the impurities. the flux will oxidise the impurities, which will float on top of the molten gold and can be removed. gold of nov 23, 2020 gold miners are among the biggest emitters of greenhouse gases in the mining sector, although critics generally point to coal miners and iron ore miners.aug 06, 2021 illegal gold represents 17% of brazils exports study In 2020, brazil exported 111 tonnes of gold, of which were mined without licences, august 2021 am