Issue 11, p. 325 (2022)

  Oral

A comparison between conventional blast hole sampling and diamond core drilling for copper grade at the Antapaccay mine

  • F. Toconas  
  • L. S. Jordan
  • S. Kedda
Quality control Superintendent of Antapaccay
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Manager Quality Assurance-Glencore.
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 Corresponding Author
South America Quality Control-Glencore
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Even though the sampling technique result in potentially biased samples with poor precision of the metal grade and are classified as specimens and not samples, the manual sampling of rotary percussion blast hole chips is still widely performed in the industry for operational grade control purposes.

The objectives of this investigation are to estimate the precision and “bias” of manual sampling by comparing the copper grade results of fifteen (15) diamond drill core samples versus fifteen (15) rotary percussion blast hole drilling chip samples. This also includes the determination of a practical manual sampling template with the highest precision to provide an understanding of the distribution of the copper content within the cone of blast hole chips. The contouring plots of the copper grades provides the selection of the best fit-for-purpose template with regards precision and operational resourcing requirements. The diamond drill core samples take into account the Increment Delimitation Error (IDE) and Increment Extraction Error (IEE) and therefore can be considered as reference samples for the purpose of this review.

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