sentences:  By 1901, when he left the company, the Moctezuma mine was a profitable, low-cost copper producer, mining ore with less than 3% copper, a record at the time.Also he had gained maturity as a mine manager and had become a sought after metallurgist.In this same time period, Dr. Ricketts designed another modern copper concentrator for the Detroit Copper Mining Company of Arizona (another Phelps Dodge controlled company) at Morenci, Arizona, and invested in what became the Valley National Bank, one of the first substantial banks in Arizona.