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Geostatistics tutorial

Introduction

Overview

Requirements

Workflow

Required files

Overview

Requirements

Tutorial profile

Important concepts

Overview

Requirements

Understand the domains

Validate the input data

Understand estimation methods and parameters

Validate the output model

2D case study: grade control

Domains

Overview

Requirements

The effect of domains on estimated values

Viewing and using domains

Basic statistics

Overview

Requirements

Histograms

Bimodal distributions

Creating a histogram

Outliers

Overview

Requirements

Outliers and topcuts

Methods of determining a topcut value

Topcutting outliers

Anisotropy

Overview

Requirements

Isotropy vs. anisotropy

Geostatistical estimations using isotropy

Geostatistical estimations using anisotropy

Ellipsoid visualiser

Variogram concepts

Overview

Requirements

Basic variogram concepts

The effect of modifying the lag distance

Omnidirectional variograms

Directional variograms

Calculating an experimental variogram

Overview

Requirements

Types of experimental variogram

Modelling a variogram

Overview

Requirements

Types of variogram model

Variogram modelling tips

Variogram maps

Overview

Requirements

Primary variogram map

Inverse distance estimation

Overview

Requirements

Isotropic vs. anisotropic inverse distance estimation

Ordinary kriging

Overview

Requirements

Impact of the nugget

Impact of the range

Impact of discretisation

Impact of edge effect

Model validation

Overview

Requirements

Comparing raw data to estimated values

Grade-tonnage curves

Basic statistics of block model values

Indicator estimation

Overview

Requirements

Indicator estimation process

Choosing indicator cutoffs

Indicator transformation

Indicator estimation

Indicator variogram maps

Overview

Requirements

Indicator variogram maps

Indicator kriging

Indicator kriging

Conditional simulation

Overview

Requirements

Normal scores transformation

3D case study: ore reserve

Domains

Create composites

Basic statistics

Overview

Requirements

Outliers

Overview

Requirements

Outliers

Removing outliers

Variogram maps

Overview

Requirements

Anisotropy ellipsoid parameters

Steps for using variogram maps to create anisotropy ellipsoid parameters

Create model

Overview

Requirements

Ordinary kriging

Overview

Requirements

Partial percentage calculation

Overview

Requirements

Model validation

Overview

Requirements

Comparing cross-sectional data with a model

Grade-tonnage curves

Basic statistics of model values

Trend analysis

Block size analysis

Overview

Requirements

Debug output from ordinary kriging

Using kriging efficiency and conditional bias slope

Block site selection