File Name : fig s1.tif

Caption : figure s1 spectral comparisons before and after pre-processing. a and b display the spectra of a sample containing 448.5 g/t of gold before and after pre-processing. c and d highlight the changes in the au spectral peaks at 199.7 nm and 242.8 nm, respectively, resulting from the pre-processing.

File Name : fig s2.tif

Caption : figure s2 per-class precision, recall, and f1-score of four classifiers on the independent test set. grade classes: low (<13.3 g/t), medium (13.3–50 g/t), high (>50 g/t).

File Name : fig s3.tif

Caption : figure s3 the micrograph of gold ore sample. 

File Name : fig s4.tif

Caption : figure s4 (a) schematic diagram of the ph-libs system components, (b) real image of ph-libs

File Name : fig s5.tif

Caption : figure s5 snr analysis of the au 199.7 nm emission line in three independent libs spectral acquisitions from the 10 g/t gold ore reference standard, displayed over the 196.5–203 nm spectral range.