Narrow vein estimation
Selecting an appropriate estimation methodology is never an arbitrary decision – it should be carefully considered, based on the geological and mineralisation characteristics as well as the proposed mining methodology. Narrow lode deposits are generally tabular in form, with the strike and down dip continuity significantly larger than the across strike continuity. Narrow vein deposits typically have samples defined on different supports, which can be problematic if the deposit is being estimated with traditional three-dimensional (3D) estimation techniques.
The two-dimensional (2D) geostatistical estimation technique is well suited to narrow lode deposits and accounts for the different sample supports by estimating the accumulation (the product of grade and thickness) and the thickness variables. Density can also be included into the calculations if appropriate.
Two-dimensional estimation techniques may not be optimal for all narrow lode deposits and are dependent on the sample support, relationship between grade and thickness, mining selectivity and experience of the resource geologist.
Cube Consulting has developed a reputation for providing estimation routines and grade control systems for situations where a 2D estimation method is more appropriate than 3D techniques.