Mining is the most dominant industrial sector in many countries with precious metal reserves. These countries already attracted industries and investors with ample opportunity for world economy, investment and development. At the same time, it is also valuable in terms of environmental effects, sustainability and global warming as the deeper it goes, the negative impact to environment increases.
http://iopscience.iop.org/article/10.1088/1757-899X/351/1/012016/pdf