This guideline sets out procedures for determining the volume of fluid tailings contained within tailings deposits. It is intended to provide guidance to operators of oil sands mines to meet the objective of controlling fluid tailings volumes to an approved plan consistent with the tailings management facility (TMF) and as outlined in Guidelines for Performance Management of Oil Sands Fluid Fine Tailings Deposits to Meet Closure Commitments. It is aimed at standardizing sampling and measurement of fluid tailings including the fluid fine tailings in conventional tailings settling ponds as well as treated deposits that may have significant coarse sand content but are still in a fluid state.