SciELO - Scientific Electronic Library Online

vol.110 número6Grab sampling for underground gold mine grade controlNugget effect, artificial or natural? índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados



Links relacionados

  • Em processo de indexaçãoCitado por Google
  • Em processo de indexaçãoSimilares em Google


Journal of the Southern African Institute of Mining and Metallurgy

versão On-line ISSN 2411-9717
versão impressa ISSN 0038-223X

J. S. Afr. Inst. Min. Metall. vol.110 no.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.



“Full text available only in PDF format”




1. REINERS, E. and MOHRHAUER, P. Hammer Sampler-a proven sampling unit, Aufbereitungs-Technik, vol. 30, no. 4. pp. 218-225.         [ Links ]

2. VAN DER MERWE, E. English; Ralph H, Device for sampling material from a moving belt conveyor, US Patent No. 5,115,688, filed 1990.         [ Links ]

3. LYMAN, G.J. Determination of Bias in Sampling Systems, Minerals Engineering, vol. 6. pp. 99-105.         [ Links ]

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons