07.10.2010 | Editor: Marcel Dröttboom
Waukesha (WI), USA – Metso will design and supply a 42 feet (12.8 metres) diameter SAG Mill for the Newmont Mining Yanacocha Conga copper-gold project in Peru. According to Metso, this mill is the world’s largest SAG mill.
Metso has been selected to design and supply a 42 × 25 feet, (12.8 × 7.6 metres) 28 MW gearless SAG mill, plus two 26 × 42 feet, (7.9 × 12.8 metres) 15.6 MW ball mills and two other mills for Newmont Mining Corporation’s Yanacocha Conga copper-gold project in Peru. According to Metso, the 42 feet diameter SAG mill is the world’s largest and is the first of its kind.
The Conga project is at its feasibility stage, and with the engineering and release for fabrication of these mills, Newmont seeks to maintain the option of proceeding with the Conga project with an accelerated schedule. Full funds approval is expected from the board of directors in the first half of 2011.
The Conga project is located approximately 560 miles (900 kilometres) north of Lima, at an altitude of 13400 feet (4100metres) above sea level. It is situated near the Newmont Yanacocha gold mine, where Metso installed what was then the world’s largest single-stage SAG mill, a 32 × 32 feet (9.75 × 9.75 metres) EGL mill, driven by a 16.5 MW ABB gearless motor, in 2008. That mill design was also the first of its kind and was customized for Newmont.
The ABB gearless mill drive system will power the SAG mill with a variable speed drive that allows the mill to start smoothly with minimal mechanical stress and with automated ‘dropped-charge’ protection. This fulfills the customer’s requirements for flexibility and adjustability of the process and enables maximum control over the grinding process.
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