S1 Data -

(XLSX)</p

Average of 25 bands of spectral image data.

(a) Coal; (b) Coal gangue.</p

Core equipment of data acquisition system.

Core equipment of data acquisition system.</p

Division of experimental data.

Division of experimental data.</p

Test confusion matrix of different algorithms.

(a) ELM; (b) KNN; (c) SVM; (d) CART; (e) AdaBoost; (f) XGBoost.</p

Principal component contribution rate.

Principal component contribution rate.</p

Multispectral images of coal and coal gangue.

(a) Spectral image of coal; (b) Spectral image of coal gangue.</p

Recognition results of different data processing methods.

Recognition results of different data processing methods.</p

Coal and coal gangue identification results of XGBoost.

(a) Accuracy; (b) Loss.</p

The comparison of training and testing results of different algorithms.

The comparison of training and testing results of different algorithms.</p