In underground mining a hoist or winder is used to raise and lower conveyances within the 1.1 Advantages 1.2 Disadvantages. 2 Friction hoist. 2.1 Advantages 2.2 Disadvantages. 3 Blair multirope hoist 4 Examples of hoists 5 See also 6 Footnotes
Mining, by its very nature, is not sustainable into the future. a range of minerals, including diamonds, gold, coal, gem stones, potting and brick clay. Surface mines offer advantages and disadvantages when compared to underground mining.
Biogas production is growing steadily, as more people are setting up biogas Here39s some advantages and disadvantages of biogas that will help you Biogas generation helps cut reliance on the use of fossil fuels, such as oil and coal.
17 Jan 2008 The Carbon in coal varies widely from 46 to 98. It will also contain The composition will depend on the mines it was taken from. The more Carbon it What are the disadvantages of being an electrician 10 answers.