This report is a review of waste rock sampling techniques. Part A presents a literature review and discussions of the various waste rock sampling techniques. Part B provides guidance to a broad spectrum of concerned parties as to the available sampling techniques and suggested methodologies to apply during the various stages of a mine development. The objective is to ensure that adequate data are collected during all stages of the mine development to ensure the database exists to evaluate the acid generating potential of the waste. The evaluation would normally include Acid Rock modelling using both empirical and computer based models. For demonstration of how these techniques have been applied, Part C of this report also provides an actual example of how data were collected and utilized to assess ARD potential at a site in Canada.