The ore that is concentrated by froth floatation process is

Which of the following ores cannot be concentrated by froth floatation process ?

Name the type of ore which is concentrated by froth floatation process.

Which of the following sulphide ore is not concentrated by froth-floatation process ?

Which type of ores is concentrated by froth floatation process ?

Sulphide ores are concentrated by froth floatation process. Write the name or formulae of any two sulphide ores of copper.