Appendix I. Global compilation of sphalerite trace element and temperature data. Appendix II. Covariance matrix of sphalerite trace element composition. Appendix III. Correlation matrix and bi-variate kernel density for sphalerite trace element data before and after data processing. Appendix IV. Machine learning algorithms and parameters for this study. Appendix V. The trace element of sphalerite from 11 representative deposits (Huize, Maoping, Tianbaoshan, Daliangzi, Huodehong, Tianqiao, Shaojiwan, Nayongzhi, Shanshulin, Yudu, Fuli) in the SYG Pb–Zn metallogenic province. Appendix VI. A new machine-learning sphalerite thermometer software (SPRFT).