Assertion: gold | /r/HasProperty | only 8% of revenue
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text: (Fresnillo and Buenaventura rely more on silver, in some lists silver production is treated as gold production, converted to gold equivalent using the gold to silver price ratio; McMoran produced 32.375 tonnes of gold in 2013 (up 32% after falling by 31% in 2012) but gold accounted for only 8% of revenue (down from 10%).