All-in sustaining cost is a metric used by mining companies to reflect the cost of gold mining in a consistent format useful to both investors and mining professionals. Cost reporting focused on the direct cost of mining and processing ore was summarized in the non-GAAP cash cost developed by the Gold Institute in 1996. In 2013, a group of mining companies, working with the World Gold Council, developed a more inclusive approach to reporting costs designed to solve the dilemma of showing a more comprehensive reflection of recurring costs involved in producing gold, without discouraging investors.
Yapo, A.G., and Camm, T.W. 2017. Preprint 17-007: All-in sustaining cost analysis: Pros and cons. Presented at the SME Annual Meeting, Denver, CO, February 19-22.