Total cash costs per ounce is not a recognized measure under IFRS and this data may not be comparable to data presented by other gold producers. Total cash costs per ounce of gold produced is presented on both a by-product basis (deducting by-product metal revenues from production costs) and co-product basis (before by-product metal revenues). Total cash costs per ounce of gold produced on a by-product basis is calculated by adjusting production costs as recorded in the consolidated statements of income (loss) for by-product revenues, unsold concentrate inventory production costs, smelting, refining and marketing charges and other adjustments, and then dividing by the number of ounces of gold produced. Total cash costs per ounce of gold produced on a co-product basis is calculated in the same manner as total cash costs per ounce of gold produced on a by-product basis except that no adjustment for by-product metal revenues is made. Accordingly, the calculation of total cash costs per ounce of gold produced on a co-product basis does not reflect a reduction in production costs or smelting, refining and marketing charges associated with the production and sale of by-product metals. The total cash costs per ounce of gold produced is intended to provide information about the cash-generating capabilities of the Company's mining operations. The Company also uses these measures to monitor the performance of the Company's mining operations. As market prices for gold are quoted on a per ounce basis, using the total cash costs per ounce of gold produced on a by-product basis measure allows the Company to assess a mine's cash-generating capabilities at various gold prices. Management is aware that these per ounce measures of performance can be affected by fluctuations in exchange rates and, in the case of total cash costs per ounce of gold produced on a by-product basis, by-product metal prices. Management compensates for these inherent limitations by using these measures in conjunction with minesite costs per tonne as well as other data prepared in accordance with IFRS.