Illegal mining on the decrease but still a cause for concern

However, he says the impact of illegal mining is not only commodity-based but also includes the chemicals, resources, materials and equipment associated with mining, as these are stolen from mines and sold.
Further, a holistic understanding of the threat of illegal mining is important in dealing with the issue. Kruger says the primary indicator for measuring the losses through illegal mining is to determine the actual value of recoveries; however, this does not provide an accurate loss value.
http://www.miningweekly.com/article/illegal-mining-on-the-decrease-but-still-a-cause-for-concern-2013-11-29