The basic aim of the process of smelting in furnaces with flame is smelting full of material and reaching effects optimal technical or economical to process with minimum consumption of fuel, maximum speed and pass as full of copper in the main product of the merger in Matte. In oven with flame, except concentration concentrate can be processed and also other material that contents copper or other precious metals that are characterized by the fine granulomeric structure as: Rich copper ore; Rich ores of precious metals; Furnace dust in copper metallurgy; The converter slag; Restoration materials with flame furnace; Surpluses and by-products of different branches of the metallurgy. One of the most important factors to good work the operation of the furnace development of chemical reactions that enable the creation of products composed of certain (mattes and slag) is the process of calculating (determining) the amount of ore that must be mixed and which are available amalgamation. Determination as accurate enabled by knowledge on the theoretical foundations of the process of melting the ore different copper chemical reactions that must take place during melting, accurate calculations and work much better furnace for melting with all assistive devices.