The formation of the mining face marks the beginning of the production period, when the decrease of gas-extraction in surface wells and long boreholes runs counter to the urgent demands of production.
The formation of acid mine drainage (AMD) from mine tailings is a severe environmental problem associated with tailings impoundments.
Exposure of mine waste containing metal sulfides, such as pyrite, to air and water leads to the formation of acid-mine drainage (AMD).[1, 2] Research in our laboratories has been focused recently on the use of phospholipids to suppress pyrite oxidation.
Although bacterial oxidation of sulfide materials results in the undesirable formation of acid mine drainage, the same reaction has been put to use for microbial leaching of copper, uranium, and other valuable metals from low-grade sulfide-containing ores.
The investigation revealed strong temporal (dry period vs. recharge period), and spatial (slope vs. central region of pile) variability in the formation of acid mine drainage.
As pyrite oxidation is the principal cause of the formation of acidic mine drainage (AMD), there has been an extensive effort to understand the mechanism of pyrite oxidation so that effective abatement strategies may be developed.
In 1953, the Technical Supervision Bureau was established which was subordinate to the Ministry of Fuel Industry, it marked the initial formation of coal mine safety management system, "administrative management, trade union supervision and labor department inspection".
The oxidation of pyrite under acidic conditions, an important process leading to the formation of acid mine drainage, has been the subject of intense research yet remains incompletely understood.
To predict the formation of acid mine drainage, the waste rocks were investigated using X-ray fluorescence with synchrotron radiation spectroscopy (XRF-SR), X-ray diffraction analysis (XRD), microscopy, and aqueous leaching and intensive oxidation experiments.
The formation of acid mine drainage from metals extraction or natural acid rock drainage and its mixing with surface waters is a complex process that depends on petrology and mineralogy, structural geology, geomorphology, surface-water hydrology, hydrogeology, climatology, microbiology, chemistry, and mining and mineral processing history.
