Mineral prospectivity mapping Deep learning GIS Machine learning Convolutional neural network Geochemical anomalies Geochemical exploration Mineral exploration Random forest Lithological mapping Direct sampling Fujian Province Geochemical survey data Geological prospecting big data Graph convolutional network Metric learning Uncertainty A-type granite AUC Adversarial autoencoder ArcFractal ArcGIS Artificial intelligence Big data analytics Cassiterite Compositional data analysis Conditional Independence Conditional independence Data augmentation Data integration