As their interests in Cripple Creek dwindled, Tutt, Penrose, and MacNeill followed a suggestion of metallurgist Daniel C. Jackling, who believed that a massive copper deposit located in Bingham Canyon, Utah could be successfully mined. Jackling had been a metallurgist for the Bingham Canyon Gold & Silver Mine, and was the chief engineer at the US Reduction Plant Company in Florence, Colorado. A survey revealed the Bingham Canyon ore deposit contained only 2% copper. After consulting both Jackling and geologist Richard Penrose, Spencer's brother, the men determined that the copper could yield high profits if they could efficiently extract the copper from the ore.