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To reduce the copper content of the waste slags it is necessary to reduce the concentration of sulphur in them before depletion. The reductive depletion of the slags is conveniently carried out in two stages. In the first brief stage it is proposed to extract the bulk of the nonferrous metals with the production of waste slags. After this the bottom phase is then withdrawn from the process and directed to the main production process. The depleted slag is processed (in the second stage) in order to extract the iron into the carbon-containing product, some of which can be used in the first stage., To reduce the copper content of the waste slags it is necessary to reduce the concentration of sulphur in them before depletion. The reductive depletion of the slags is conveniently carried out in two stages. In the first brief stage it is proposed to extract the bulk of the nonferrous metals with the production of waste slags. After this the bottom phase is then withdrawn from the process and directed to the main production process. The depleted slag is processed (in the second stage) in order to extract the iron into the carbon-containing product, some of which can be used in the first stage.