The cost of producing gold varies from one miner to the next, and is reported as the all-in sustaining cost (AISC). AISC was first introduced in 2013 by the World Gold Council. Deposit type, energy costs and inflation are the factors that have the largest impact on AISC. The average AISC for the entire gold industry is calculated by averaging the production costs of the largest gold producers. The average AISC fluctuates with changes in energy costs and inflation.