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Mine tailings are large piles of crushed rock that are left over after the metals of interest like lead, zinc, copper, silver, gold and others, have been extracted from the mineral rocks that contained them.

The mineral separation process, especially in older mining operations, is only partially efficient. As a result, after the crushing and grinding (milling) processes, some of the metal-containing minerals are left behind as small tailings particles.

Why are mine tailings an emerging issue?

According to a U.S. Environmental Protection Agency (USEPA) Region 9 assessment of state data, there are approximately 420,000 abandoned mines in the states of California, Arizona and Nevada. A total of 13,243 of those are considered “abandoned mines with potential environmental hazard”. There are even larger numbers of sites in northern Mexico.

Disposal of mine tailings is one of the most important environmental issues for any mine during the project's life. Whilst significant pressure is placed on mining projects in developed countries to conform to stringent environmental standards, many projects in developing nations do not take significant steps to prevent or mitigate environmental damage.

In order to prevent the uncontrolled release of tailings material into the environment, mines usually have a disposal facility which quite often takes the form of a dam or pond. This is a convenient method of storage since tailings are often in the form of a slurry when they are discharged from the concentrator. These facilities often require the clearing of more land than the rest of the mine (including open-pit operations) combined, and failure of the wall can result in a massive release of tailings. As such they are of great environmental concern.

Tailings release and subsequent damage to the environment can also occur without catastrophic failure of the storage facility. These kinds of release are much less obvious and may take the form of acid drainage or dry tailings dust being blown away from the storage area. Several major environmental disasters have been caused by tailings dam failures and other release of tailings into the environment. Some examples are the Ok Tedi environmental disaster, the Buffalo Creek Flood, the 2000 Baia Mare cyanide spill and the Ajka alumina plant accident.

These problems are extensive and can persist for decades because these sites have low pH and lack normal soil stabilization processes. As a result these sites do not develop normal soil structure or support the establishment of a plant cover. Many of these mining areas have been economically developed within the last century, and as a result, are now located next to large urban populations. Thus, there are both human and ecological health impacts that can occur from exposure to dust that is blown from these sites. These issues are of particular concern with regard to children in nearby communities and for sensitive riparian or wildlife refuge areas.

Technology of artificial sand making from mine tailings

Mine tailings Disposal Technology characteristics:

1 / VSI series vertical shaft impact crusher has self-crushing principles so that the shape of manufactured sand is good.

2 / The rank of artificial sand is reasonable, fineness modulus is adjustable.

3 / Index of artificial sand is accord with the standard of country, and is the high quality concrete aggregate.

4 / The cost for making end products of sand is low and the benefit is good.
Mine Tailings Disposal

The tail foresees accurately to include “extraordinary resources”, reaches 8-12% iron ore including the content, in each ton has 0.2-0.6 gram gold, 0.02-0.1% contents copper and 0.2-0.5% contents zinc and lead. Tail material recycling use not only helps environment, moreover helps to reduce the primary ore the mining level. You need mine tailing crusher and mine tailing grinding mill in metal extraction process.

Using mine tail material to produce man made sand and hollow brick can also bring high profits and solve the environmental problem. VSI series crusher machine can help you to make sand with mine tailing.

Sand Making Machines for Mine Tailing :
mobile jaw crusher | PFW impact crusher | HPC cone crusher | VSI5X crusher | SBM VSI crusher | PCL VSI crusher | vibrating feeder | sand washer
Hollow Brick Making Machine :
mobile cone crusher | mobile impact crusher | HPC cone crusher | vertical roller mill | MTW mill | SCM super thin mill | belt conveyor
Equipments for Metal Extraction from Mine Tailing :
PEW jaw crusher | impact crusher | CS cone crusher | MTM trapezium mill | MXB mill | high pressure mill | raymond mill | vibrating screen