Exploiting HMSD is usually in the form of ruinous strip mining and probably the most destructive method of excavation in conservation terms. Mining these resources will result in the two river lines being ripped up, down to bedrock basically, and heavy, noisy machinery and processing lines moving down each riverbed with its commensurate destruction of the flora and fauna in its path, not to mention the toxic filth of such process. Progressive miners may attempt to rehabilitate the ecosystem they usually destroy with ecologically similar species, but Zimbabwe’s nouveau indigenous miners have no good track record of this, or of pouring funds back into the local community.
http://www.zimeye.org/?p=57711
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