BS ISO 12743:2006

Foreword
1 Scope
2 Normative references
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
        8.3.3 Cutter speed
   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 (normative) Sampling stage method of estimating
        sampling and total variance
Annex B (informative) Estimation of total variance - Barge
        unloading using a grab
Annex C (informative) Mechanical sample cutters
Annex D (informative) Checklist for mechanical sampling
        systems
Annex E (normative) Manual sampling devices
Annex F (informative) Apparatus for manual sampling of
        concentrates from stopped belts
Annex G (informative) Sampling of stockpiles
Annex H (normative) Increment division scoops for conducting
        manual increment division
Bibliography

Describes 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.