Optimal grade control sampling practice in open-pit mining - a full-scale blast hole versus reverse circulation variographic experiment

Karin Engström, Kim H. Esbensen

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

1 Citationer (Scopus)

Abstrakt

Misclassification of ore grades results in lost revenues and the need for representative sampling procedures in open-pit mining is increasingly important in all mining industries. This study evaluated possible improvements in sampling representativity with the use of Reverse Circulation (RC) drill sampling compared to manual blast hole (BH) sampling in the Leveäniemi open-pit mine, northern Sweden. The results of the variographic experiment showed that sampling variability was lower for RC than for BH sampling. However, the total costs for RC drill sampling are significantly more than for manual BH sampling; other benefits may motivate the introduction of RC drilling. The main conclusion is that manual BH sampling can be fit-for-purpose in the studied open-pit mine. However, with so many mineral commodities and mining methods in use globally, there is no universal best practice for open-pit drill sampling and each case must be evaluated individually.

OriginalsprogEngelsk
Sider (fra-til)176-187
Antal sider12
TidsskriftTransactions of the Institutions of Mining and Metallurgy, Section B: Applied Earth Science
Vol/bind126
Udgave nummer4
DOI
StatusUdgivet - 2 okt. 2017

Programområde

  • Programområde 3: Energiressourcer

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