A practical illustration is the issue of the use of mercury by Galamsey operators. In order to get to the point that the PMMC can buy their gold, collected gold gravel and flakes must be amalgamated into a sellable form. Some people melt the gold together in a furnace, but another common method involves mixing it with mercury and then burning the mercury back off. This leads to release of mercury, a harmful substance into the environment. Legalisation for example could provide for the purchase of these gravels and flakes for a more environmentally friendly process to be used in their processing.
http://www.ghanamma.com/2011/12/galamsey-a-look-through-another-lens/
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