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|Flotation is the primary method for copper minerals separation from porphyry ores. The need to process difficult-to--float porphyry copper ores presents challenges to engineers and scientists in several areas. This paper is concerned with summarizing generalized problems faced in processing porphyry ores and treatment methods to overcome them. Though some of the problems are interrelated, they are classified into three broad categories. The case studies of some of the successful applications of innovative methods to solve problems related to ore mineralogy, metallurgical aspects of ore treatment, and process variables show that quite often the problems are solvable by a judicious choice of flotation variables.|