1) Textbook of Ore Dressing (2) Principles of Mineral Dressing

THE maintenance of the present standard of living of civilized man is dependent upon an adequate supply of metals, without which conditions would return to those of the Stone Age. The production and preparation of food, clothing, transport and other necessities all depend fundamentally upon the provision of the requisite tools. These tools are largely made from metals, and to cover wastage and also expansion in the use of mechanical aids fresh supplies have to be made available continuously.