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Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water.

Mining of stones and metal has been a human activity since pre-historic times.

Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, and final reclamation of the land after the mine is closed.

Mining operations usually create a negative environmental impact, both during the mining activity and after the mine has closed.

Others included the use of irritant leaves, fasting, bloodletting, pouring hot water onto the abdomen, and lying on a heated coconut shell.

Archaeological discoveries indicate early surgical attempts at the extraction of a fetus; however, such methods are not believed to have been common, given the infrequency with which they are mentioned in ancient medical texts.

Hence, most of the world's nations have passed regulations to decrease the impact.

Work safety has long been a concern as well, and modern practices have significantly improved safety in mines. Unless future end-of-life recycling rates are stepped up, some rare metals may become unavailable for use in a variety of consumer products.

This thesis describes numerical methods for the evaluation of the series impedance matrix and shunt admittance matrix of underground cable systems.The central portions of a rapid transit network are usually in tunnel.Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers.Using the Pollaczek's formulae as the standard for comparison, the formula of Ametani and approximations proposed by other authors are studied.Mutual impedance between an underground cable and an overhead conductor is studied as well.Using other people’s research or ideas without giving them due credit is plagiarism.