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guyanas extractive industry sector (eis) - wwf

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bureau of mines publications and articles, 1992-1993 - cdc

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ex-99.1 12 tv516814_ex99-1.htm exhibit 99.1 exhibit

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the economic benefits and costs of frac-sand mining in

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prehistoric exploitation of minerals resources - springerlink

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global trends in artisanal and small-scale mining (asm): a

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process automation | major abb mining project demonstrates

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energy efficiency in the minerals industry

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