Grade Control in narrow vein deposits

Cube Consulting has many years experience developing and implementing techniques to improve the modelling and grade control of narrow lode deposits. Selecting an appropriate estimation methodology for a mineral deposit is not an arbitrary decision. This decision should be based on the geological and mineralisation characteristics, as well as the envisaged mining methodology.

Two-dimensional (2D) geostatistical estimation techniques are well suited to narrow lode deposits where no mining selectivity is possible across the width of the lode. 2D methods account for the different sample lengths/supports by estimating an ‘accumulation’ variable, which is defined as the product of the measured grade and the thickness of the lode. The final estimated grade is defined as the ratio between the estimated accumulation and the estimated thickness.

2D estimation techniques may not be optimal for all narrow lode deposits and are dependent on the sample support, relationship between grade and thickness/density, envisaged mining selectivity and experience of the resource geologist.

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