Found this publication from 2004 that you might be interested in. The Escondida Sulphide Leach Project: "Since the start of mining operations, Escondida has been segregating and stockpiling run-of-mine (ROM) low-grade copper sulphide ore. In the absence of an economic technology to process this material it was mined as waste. Since the mid 1990s, Escondida and, in particular, BHP Billiton has been developing technology to process low-grade sulphide ores through bacterially assisted leaching to produce copper cathode. The development of this technology
would allow Escondida to unlock additional economic value through processing the low-grade sulphide ore." (Print xxxx-AngosturaBrochure (bhp.com))
Ann: Higher Grade Core Confirmed at Cortadera, page-40
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