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Journal of the Southern African Institute of Mining and Metallurgy

On-line version ISSN 2411-9717
Print version ISSN 2225-6253

J. S. Afr. Inst. Min. Metall. vol.110 n.6 Johannesburg Jun. 2010




Bias testing of cross-belt samplers



G. LymanI; M. NelII; F. LombardIII; R. SteinhausIV; H. BartlettV

IMaterials Sampling and Consulting Pty Ltd, Australia
IIKumba Iron Ore, South Africa
IIIUniversity of Johannesburg, South Africa
IVMultotec Process Equipment, Johannesburg, South Africa
VConsultant, South Africa




The cross-belt sampler is a device that is very widely used even though it has not been ratified by the Standards associations. This paper is concerned with the bias testing of two cross-belt sampler designs against stopped belt samples and a cross-stream cutter at the belt end. The bias analysis is carried out using size distribution as the analyte and conventional t-testing and the Hotelling T squared test, which are compared for their effectiveness. The paper considers the issue of detectable bias and the statistical planning of bias tests.



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