Support Correction

The aim of Support Correction is to model the histogram of blocks by using a point anamorphosis function and a point variogram model.

The support correction is necessary to perform the following actions:

• Report global Grade-Tonnage curves. It is available in this panel.
• Local estimation of the recoverable resources (Uniform Conditioning and Localized Uniform Conditioning available in a separate feature).
• Direct Block Simulations method available in the Simulations module.
• Conditional expectation and additional resulting variable such as quantiles, confidence intervals, probability of exceeding a threshold, etc, available in the Kriging task.

To perform the support correction operation, there are two different available methods based on the Discrete Gaussian Model:

• The Standard Method (also known as Discrete Gaussian Model 1; DGM1) which makes it possible to report global Grade-Tonnage curves and to perform the local estimation of the recoverable resources. DGM1 was proposed by Matheron (1976).
• The Gaussian Method (also known as Discrete Gaussian Model 2; DGM2) which is necessary to perform Direct Block Simulations. DGM2 was proposed by Emery (2007).

References:

• DGM1: Matheron, G. (1976). Forecasting Block Grade Distributions: The Transfer Functions. In: Guarascio, M., David, M., Huijbregts, C. (eds) Advanced Geostatistics in the Mining Industry. NATO Advanced Study Institutes Series, vol 24. Springer, Dordrecht
• DGM2: Emery, X. (2007). On some consistency conditions for geostatistical change-of-support models. Mathematical geology, 39(2), 205-223