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Generally, mining has a significant gray WF, but it is difficult to obtain quantitative data for this. The first source of pollution can come from the overburden, the waste soil and rock that has to be removed before the ore deposit can be reached and that has to be stored somewhere after removal. The strip ratio, the ratio of the quantity of overburden to the quantity of mineral ore extracted, can be much higher than one. The overburden material, sometimes containing significant levels of toxic substances, is usually deposited on-site in piles on the surface or as backfill in open pits, or within underground mines (ELAW, 2010). Through erosion, runoff, and seepage, these toxic substances may reach groundwater or surface water bodies. The second source of pollution comes from the pit itself, where similar processes may spread toxic chemicals into the wider environment. In addition, mine dewatering can bring polluted water from the mine to the streams into which the water is released. The third source of pollution comes from the waste material that remains after concentration of the valuable mineral from the extracted ore and that often contains various toxic substances (like cadmium, lead, and arsenic). This waste, the so-called tailings, is generally stored in tailings ponds, which may leak. Also, there are numerous incidents of tailings reservoir dam breaks, after which the content of the reservoir released itself into the environment. A fourth source of pollution can come from the process of heap leaching. With leaching, finely ground ore is deposited in a large pile (called a leach pile) on top of an impermeable pad, and a solution containing cyanide is sprayed on top of the pile. The cyanide solution dissolves the desired metals and the pregnant solution containing the metal is collected from the bottom of the pile using a system of pipes, a procedure that brings significant environmental risk (ELAW, 2010). Finally, a form of mining that typically results in significant water pollution is the so-called placer mining, in which bulldozers, dredges, or hydraulic jets of water are used to extract the ore from a stream bed or flood plain (ELAW, 2010). Placer mining is a common method to obtain gold from river sediments

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Pyb-900 Spring Cone Crusher For Basalt,Quartz,Iron Ore,Mining , Find PYZ- 1750, 1750, 185, 10-30, 115-320, 155-160, 50.3, 487038004192 After-sales department has well-trained employees and professional installation engineers

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Imagine sand being poured from a conveyor belt onto a heap, forming a cone. Under ideal conditions, the sides of this cone regardless of its size will always have the same slope, determined by granular properties of the sand, humidity, and other factors. Assuming that the sand is poured at a steady rate, how fast is the height of the heap growing?

Energy efficiency in size reduction by grinding is typically less than 20 percent, indicating an enormous potential for improvement. Autogenous and semiautogenous mills, which offer economic benefits because of their relatively large scale and simplicity, quickly gained acceptance. These mills are well suited to continuous, high throughput and can be moderately controlled to produce the required distribution of particle size. However, autogenous grinding is only one step in the total comminution process, which includes sizing, pumping, and often crushing. When evaluating a comminution circuit, energy consumption of all aspects of the system should be considered

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