The price of metals is the most important category in the production chain of basic metals, as it defines the business position of the mine. Besides this, the selling price of metals impacts the sustainability of the metal exploitation in general and basic metals as well. The prediction of metal prices at the same time is both science and art through which future economic events are predicted. Since the manager's role is to think attractively for a future period, nowadays he is equipped with more advanced mathematical tools. The mathematical methods that will be used, must be selected carefully for each case because there is no single universal method for all cases. Predictions and their coming through vary, the slighter variations of the reality from predictions may be compensated with capacities, quality, by changing the inventory amount or by changing the orders. However, greater variations may cause great production and business disorders.