Gold-washing techinique used in Amazon region: Chupadeira is a hydraulic extraction technique. Heavy machinery is used to excavate the site where the search for gold is taking place, in order to reach the gold-bearing sediments. Next, the prospectors direct high-pressure water jets into these large, deep holes to dislodge and break up the sediments. Men remove debris from pit. Agua Branca region, Para State, Amazon, Brazil.