This book contains information about how main base metals are made, what everyone especially metallurgists, chemists, process and mine engineers should know about their elaboration from the mine to the metallic state. This book is already used by several applied sciences department and engineering schools and universities in the world. Processes are clearly explained and described with more than 100 flow-sheets, sketches and graphs. This book contains common and up-to-date extraction processes and will fill the will to know of many, it will help to have in hand the essential on extractive metallurgy of base metals and some strategic ones. This book is written in a clear and understandable way by an experienced metallurgist engineer and can be read by focusing straight on a particular metallurgy as it is developed metal by metal. All processes are different even if some are similar, you have better to go through to learn or refresh yourself. Roger Rumbu, Met. Eng., P.P.M.