ISO/AWI 20212-1

A working group has prepared a draft.

Abstract

This International Standard sets out the basic methods for sampling copper, lead, zinc and nickel ores, including stopped belt sampling, to provide samples for chemical analysis, physical testing and determination of moisture content in accordance with the relevant International Standards. Where the ores are susceptible to significant oxidation or decomposition, it is necessary to use a common sample for moisture determination and chemical analysis to eliminate bias (see ISO 10252). In such cases, the common sample must be sufficiently representative, i.e. unbiased and sufficiently precise, for chemical analysis and determination of moisture content. Stopped-belt sampling is the reference method for collecting ore samples against which mechanical and manual sampling procedures may be compared. Sampling from moving streams is the preferred method. Both falling-stream and cross-belt samplers are described. Sampling from stationary lots is used only where sampling from moving streams is not possible, eg, sampling of stockpiles. The procedures described in this International Standard for sampling from stationary lots are designed to minimize some of the systematic sampling errors that may arise when sampling stationary lots.