 EVO = Enterprise Value/Ounce (gold equivalent) = Enterprise Value divided by resources.The enterprise value is the difference between a company's market capitalization (product of the number of company shares and listed stock price) and its cash, investments less debt (amortization).Three of the 10 largest companies by market cap that engage in gold mining, Fresnillo, Buenaventura and Freeport-McMoran (copper/molybdenum) are not included in the first list because they are minor gold producers/most of their revenue comes from a metal other than gold (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%).