This document identically adopts ISO 12743:2021 which sets out the basic methods for sampling copper, lead, zinc and nickel concentrates from moving streams and stationary lots, 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 concentrates are susceptible to significant oxidation or decomposition, a common and sufficiently precise sample is used for moisture determination and chemical analysis to eliminate bias (see AS 2863).
Table of contents
Annex D
Header
About this publication
Annex E
E.1 Scope
E.2 Manual cutters
E.3 Sampling scoops
Preface
Annex F
Foreword
Annex G
G.1 General
G.2 Selection of sampling points
G.3 Mass of primary increments
G.4 Number of primary increments
G.5 Sampling procedure
G.6 Constitution of lot samples or subsamples
Annex H
1 Scope
2 Normative references
Bibliography
3 Terms and definitions
4 Sampling theory
4.1 General
4.2 Total variance
4.3 Sampling-stage method of estimating sampling and total variance
4.4 Simplified method of estimating sampling and total variance
4.5 Interleaved sample method of measuring total variance
5 Establishing a sampling scheme
6 Mass of increment
6.1 General
6.2 Mass of increment for falling-stream samplers
6.3 Mass of increment for cross-belt samplers
6.4 Mass of increment for manual sampling from stationary lots
6.4.1 Primary increments
6.4.2 Mass of secondary and subsequent increments
6.5 Mass of increment for stopped-belt reference sampling
7 Methods of sampling from concentrate streams
7.1 General
7.2 Mass-basis systematic sampling
7.2.1 General
7.2.2 Sampling interval
7.2.3 Sample cutter
7.2.4 Taking of primary increments
7.2.5 Constitution of subsamples and lot samples
7.2.6 Types of division
7.2.7 Division of increments
7.2.8 Division of subsamples
7.2.9 Division of lot samples
7.3 Time-basis systematic sampling
7.3.1 General
7.3.2 Sampling interval
7.3.3 Sample cutter
7.3.4 Taking of primary increments
7.3.5 Constitution of subsamples and lot samples
7.3.6 Types of division
7.3.7 Division of increments and subsamples
7.3.8 Division of lot samples
7.4 Stratified random sampling
7.4.1 Fixed mass intervals
7.4.2 Fixed time intervals
8 Mechanical sampling of concentrate streams
8.1 General
8.2 Design of the sampling system
8.2.1 Safety of operators
8.2.2 Location of sample cutters
8.2.3 Provision for interleaved sampling
8.2.4 Provision for stratified random sampling
8.2.5 Checking precision and bias
8.2.6 Avoiding bias
8.2.7 Minimizing bias
8.2.8 Configuration of the sampling system
8.3 Sample cutters
8.3.1 General
8.3.2 Design criteria
8.3.2.1 General
8.3.2.2 Falling-stream cutters
8.3.2.3 Cross-belt cutters
8.3.3 Cutter speed
8.3.3.1 General
8.3.3.2 Falling-stream cutters
8.3.3.3 Cross-belt cutters
8.4 Mass of increments
8.5 Number of increments
8.6 Sampling interval
8.7 Routine checking
9 Manual sampling of concentrate streams
9.1 General
9.2 Choosing the sampling location
9.3 Sampling implements
9.4 Mass of increments
9.5 Number of increments
9.6 Sampling interval
9.7 Sampling procedures
9.7.1 General
9.7.2 Full stream cut from a falling stream
9.7.3 Partial stream cuts from a falling stream
9.7.4 Sampling from moving conveyor belts
10 Stopped-belt reference sampling
11 Sampling from grabs
11.1 General
11.2 Mass of primary increments
11.3 Number of primary increments
11.4 Method of sampling
11.5 Constitution of subsamples and lot samples
12 Sampling from trucks, railway wagons and sampling hoppers
12.1 General
12.2 Mass of primary increments
12.3 Number of primary increments
12.4 Method of sampling
12.5 Constitution of subsamples and lot samples
13 Sampling of concentrate in bags or drums
13.1 General
13.2 Mass of primary increments
13.3 Number of primary increments
13.4 Method of sampling
13.4.1 General
13.4.2 Sampling during filling or emptying
13.4.3 Spear sampling
13.5 Constitution of subsamples and lot samples
14 Sampling of stockpiles
15 Methods of comminution, mixing and division
15.1 General
15.2 Comminution
15.2.1 General
15.2.2 Mills
15.3 Mixing
15.3.1 General
15.3.2 Methods of mixing
15.4 Division
15.4.1 Chemical analysis samples
15.4.2 Moisture samples
15.4.3 Number of increments for division
15.4.4 Minimum mass of divided sample
15.4.5 Rotary sample division
15.4.6 Cutter-type division
15.4.7 Manual increment division
15.4.8 Spear division
15.4.9 Fractional shovelling
15.4.10 Ribbon division
15.4.11 Riffle division
16 Sample requirements
16.1 Moisture samples
16.1.1 Mass of test portion
16.1.2 Processing of samples
16.2 Chemical analysis samples
16.3 Physical test samples
17 Packing and marking of samples
Annex A
A.1 Components of sampling error and sampling variance
