Mineral-rich African states have been deprived of huge sums of royalties and taxes by mining firms, a report says.
The report, by prominent development charities, blames a lack of legislative oversight and excessively generous tax concessions agreed with the firms.
It says some mining companies have also avoided paying tax through secret contracts with African governments.
The study covers South Africa, Sierra Leone, Ghana, the Democratic Republic of Congo, Malawi, Tanzania and Zambia.
Commissioned by development charities including Christian Aid and ActionAid, the Breaking the Curse report calls for reform of the institutional framework that negotiates mining concessions and monitors the royalties paid.
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