Learning and Discussion of Innovative ideas about Mining Waste Management and also Mining Related News and Activities




Friday, 28 April 2017

Abandoned Mines and Possible Issues

Acid Mine Drainage (AMD)  is a common issue in abandoned mines. AMD is produced by oxidation of pyrite (FeS2) and AMD also contains heavy metals.

After the exploitation of sulfide minerals in the metals mines, heavy metals such as pyrite, chalcopyrite, sphalerite, galena and other minerals that are not mined during the mining operation. The remaining minerals react over time with groundwater and oxygen and produce acid mine drainage that heavy metals are contained in it.

Tailings dam where tailings of mine related waste are dumped into the tailings dam or Tailings Storage Facility (TSF) become a source of mine pollution as seepage. Metals in the seepage water from the tailings dam dissolve out with rain and surface water which eventually contribute to the issues.

The content of heavy metals reduces the pH level of Water and reduces the quality of water which people commonly refer to as mine pollution.
Photo: Example of Abandoned Mine  - Mt.Sinivit Gold Mine, PNG.

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