Minera Yanacocha is operating several gold and copper mines in Peru. The "stage 7 project" comprises the exploration of a new copper mine.
Pumps Plus (Denver, USA) was employed by Bechtel International Corporation to lower the ground waterj of the "stage 7 project".
21 submersible contractors' pumps type GSZ-75-4, 75kW each, were used.
Ducts were drilled at an angle of 30° and lined by 1,2m dia. steel pipes. Then the pumps were mounted at special slides and lowered into the duct.