This work should contribute to a better understanding of bubble–particle attachment mechanism occurring during flotation of copper-sulphide ores. This relationship may be used in the future to develop a practical method (without assays) to monitor changing grade for a specified system (flotation plant). It also may be possible to develop a method to infer potential grade if mineralogy samples are available, but not enough samples are available for conventional flotation tests. This requires a significant amount of further work.