descriptions of the use of a flotation process have been found in ancient greek and persian literature suggesting its antiquity. during the late 19th century, the process basics were discovered through a slow evolutionary phase. during the first decade of the 20th century, a more rapid investigation of oils, froths, and agitation led to proven work-place applications, especially at broken hill, australia, that brought the technological innovation known as “froth flotation.” during the early 20th century, it dramatically revolutionized mineral processing.