Inventories are measured at acquisition or production cost. Production cost includes all direct costs as well as a systematically allocated share of the production-related overheads.

The acquisition costs of copper concentrates and raw materials for recycling are determined by deducting the treatment and refining charges negotiated with the supplier from the purchase value of the metal. Treatment and refining charges are fees that are charged for processing ore concentrates and raw materials for recycling into copper and precious metals.

In the smelters, work in process is measured by initially measuring the metal content. The equivalent cost of the processing that is still required for production of the fine metal is deducted from this figure. In this manner, the costs incurred during the production process are successively recognized as a component of the total production cost. This procedure applies to the production of copper and precious metals.

In the case of copper products, both the metal components and the costs incurred for further processing the copper into special formats – such as continuous cast rod, shapes and rolled products – are taken into consideration for the measurement of finished goods by applying a calculated surcharge.

Inventories are measured using the average cost method in accordance with IAS 2. This is recognized as at the reporting date at the lower of cost and net realizable value. Net realizable value is determined on the basis of quoted commodity exchange or market prices as at the balance sheet date.