105
and SVM had significantly better results than k-means, probably due to k-means not using
training data. This indicated that for this type of data it is better to use a supervised or
semi-supervised method. In Test 2 the highest accuracies were for shale, as BIF and ore are
easier to misclassify due to their higher similarity. Test 3 had higher accuracies than Test 1,
indicating that geochemical assays are a better indicator of WA or MN. Although they had
similar results, autoencoder is preferable to SVM for this application as it can handle more
than two categories. Overall, deep learning using autoencoder produced a high accuracy and
is an effective machine learning technique to use when to classifying this type of geological
and geochemical data.
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