Ore Grade Prediction Using a Genetic Algorithm and Clustering Based Ensemble Neural Network Model |
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Authors: | Snehamoy Chatterjee Sukumar Bandopadhyay David Machuca |
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Institution: | (1) Department of Mining Engineering, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India |
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Abstract: | Accurate prediction of ore grade is essential for many basic mine operations, including mine planning and design, pit optimization,
and ore grade control. Preference is given to the neural network over other interpolation techniques for ore grade estimation
because of its ability to learn any linear or non-linear relationship between inputs and outputs. In many cases, ensembles
of neural networks have been shown, both theoretically and empirically, to outperform a single network. The performance of
an ensemble model largely depends on the accuracy and diversity of member networks. In this study, techniques of a genetic
algorithm (GA) and k-means clustering are used for the ensemble neural network modeling of a lead–zinc deposit. Two types of ensemble neural network
modeling are investigated, a resampling-based neural ensemble and a parameter-based neural ensemble. The k-means clustering is used for selecting diversified ensemble members. The GA is used for improving accuracy by calculating
ensemble weights. Results are compared with average ensemble, weighted ensemble, best individual networks, and ordinary kriging
models. It is observed that the developed method works fairly well for predicting zinc grades, but shows no significant improvement
in predicting lead grades. It is also observed that, while a resampling-based neural ensemble model performs better than the
parameter-based neural ensemble model for predicting lead grades, the parameter-based ensemble model performs better for predicting
zinc grades. |
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Keywords: | |
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