Conga Project Ball Mill. The conga project is located approximately 560 miles 900km north of lima, at an altitude of 13,400ft 4100m above sea level.It is situated near the newmont yanacocha gold mine, where installed what was then the worlds largest single-stage sag mill, a 32ft x 32ft 9.75m x 9.75m egl mill, driven by a 16.5mw abb gearless motor, in.