Coal Extraction Case Study

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Q.1. How is the process of coal extraction different from oil extraction?
Coal is usually in solid black or black brownish in color and it is the mineral formed beneath the earth through sedimentation process from remains of death plants. Geologically it takes millions of years for the formation of coal and need of heavy expenditure for the extraction process since coal can only be found several feet beneath the earth. The depth of the coal reserve determines the method of coal extraction. Surface mining method is more convenient if the reserve is less than 200 feet beneath and underground mining method is opted if the reserve lies beyond 200 feet below the surface. Surface mining involves removing of shallow coal over a wide area where the …show more content…

Surface mining can also lead to the drastic changes of landscapes, destruction of habitat, damages to water supplies, and air pollution thereby causing huge environmental effect. Also the loss or degradation of forest added degrades groundwater because coal are often serve as underground aquifers, and the removal of coal beds may result in drastic changes in hydrology after mining has been completed. Moreover, green house gas is one of the causes in emission since mountaintop removal releases large amounts of carbon through clear cutting and burning of trees. Beside, liquid coal known as sludge is generated by washing coal. It is naturally disposed of at impoundments located near coal mines, but in some cases, it is sometimes directly injected into abandoned underground mines. Since coal contains toxins get leaks or spills etc can cause danger to underground and surface waters. The coal mining activities have exposed rocks containing the sulphur-bearing mineral pyrite that reacts with air and water to form sulphuric acid and dissolved iron, and as water washes through mines, this compound forms a thin acid, which can afterward wash into nearby rivers and streams called Acid Mine Drainage (AMD). The transportation of coal is another issue (disadvantages) because coal is often transported via trucks, railroads, and large cargo ships, which release air pollution such as soot and can lead to disasters that ruin the environment. (Environmental Impacts of

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