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Highest-grade gold mines in 2017 - MINING.COM
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How much gold is there left to mine in the world? - BBC News
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Refractory gold reserves: Challenges and opportunities for a key source of growth | McKinsey
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India has 500 million tonnes of gold ore reserves: Govt
UP eyes jackpot with goldmine reserve in Sonbhadra; almost 3,350 tonne of gold ore expected | India News – India TV
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