Classify industries into two groups on the basis of metallic minerals.
Answers
Most minerals that constitute ores, especially sulfides and sulfosalts, are formed under reducing environments and under temperatures significantly higher than atmospheric. Thus, when these minerals are exposed to surface environmental conditions, they tend to disintegrate chemically to form new compounds until equilibrium it is restored (Park and MacDiarmid, 1975; García-Lorenzo et al., 2012; Wei and Wolfe, 2013; Li et al., 2015).
Before the development of mining activities, the amount of sulfides exposed to the favorable condition of this oxidative weathering is reduced. As a consequence of mining exploration, large quantities of sulfides are exposed to oxygen, water, and bacteria that generate acidic environments which promote the metal(loid) solubilization, forming AMD.
The abandonment of a mine as the final episode of mining activities leads in many cases to the maintenance of or even an....