The sampling and estimation of the metal present in an ore dump or a tailings heap are matters which are of considerable importance to most men connected with the mining industry, as they are often called upon to handle this class of work, either tor themselves or for others. There are several important points which can be settled concerning the material in an ore dump or tailings heap before any work is started in the shipping or in the treatment of the material, and most of these points can be decided from the results obtained from the analyses, the testing of the samples or the reports from the smelters on the samples. 20 p.