Problem
Research questions and friction points this paper is trying to address.
ore grade estimation
adaptive sampling
information value
geological heterogeneity
drill-hole optimization
Effective information gathering for ore estimation, evaluation and perspectives on adaptive sampling
🤖 AI Summary
This study addresses the challenge of inefficient drill-hole sampling for ore grade estimation in geologically complex regions by proposing a novel information value assessment method that does not require conditional simulation. Built upon Gaussian processes and Bayesian posterior predictive distributions, the approach incorporates structural similarity metrics to enable adaptive spatial sampling within heterogeneous or partitioned geological domains—without relying on assumptions of stationarity or error independence. The strategy effectively targets areas of high spatial uncertainty and supports cost–benefit trade-offs and short- to long-term exploration decisions even in the absence of ground-truth references. Experimental results demonstrate that, compared to regular grid sampling, the proposed method substantially reduces uncertainty in grade estimation, thereby establishing a foundational methodology for future embodied intelligent robotic collaborative exploration.
📝 Abstract
A computational/analytics framework for assessing the value of drill-hole information in ore grade estimation is described using Gaussian Process and statistics. A distinguishing feature is that it presents both a near-term and long-term vision, circumvents conditional simulations and avoids making rigid assumptions such as stationarity and uncorrelated errors. Two experiments are devised to cater for situations where geological domains are differentiated or mixed. In scenario 1, performance (learning) curves are obtained to inform in-fill drilling and spacing consideration consistent with current practice. Analysis shows it is possible to estimate the incremental cost and reward via a proxy measure without relying on the ground truth, using insights obtained from a similar deposit, adjacent bench or domain. Scenario 2 examines adaptive sampling strategies and focuses on applying these in geologically complex areas with discontinuities and heterogeneous composition. Evaluation is made based on structural similarity, the mean and uncertainty in the posterior predictive distribution for the grade. The results highlight situations where regular grid sampling is suboptimal, and demonstrate an adaptive strategy that targets spatial complexity is capable of narrowing this gap. The proposed methodology can potentially be used in the future in an exploration--exploitation setting that involves sampling, machine learning, reasoning and cooperation between robots with embodied intelligence on a mine site.
Innovation
Methods, ideas, or system contributions that make the work stand out.
adaptive sampling
Gaussian Process
ore grade estimation
information value
embodied intelligence
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