Gravity separation process is used for the concentration of:
calamine
haematite
chalcopyrite
bauxite
Which of the following is not an ore of magnesium?
Magnesite
Dolomite
Gypsum
Carnallite
In Mc Arthur forest method, silver is extracted from the solution of Na[Ag(CN)2] by the use of:
Fe
Mg
Cu
Zn
