In electro refining of copper some gold is deposited at 

__________ is an example for oxide ore.

__________  method is suitable for the purification of Hematite.

The ore that is concentrated by forth floatation process is

Important ore of Mg is

Which one of the following is malachite ore of copper?

During smelting an additional substance is added which combines with impurities to from a fusible product which is known as

The chemical composition ' slag ' formed during the smelting process in the extraction of copper is :

Argentite is a mineral of 

Which element has the largest abundance in the earth’s crust?