Identification of hydrothermal alteration and mineralization in the Sancha magmatic Cu-Ni-Au sulfide deposit, NW China: Implications for timing and genesis of mineralization

•Sancha is a magmatic Cu-Ni-Au deposit with notable hydrothermal Au and Cu accumulation but slight in Ni.•The magmatic and hydrothermal mineralizations took place in 489 ± 3 Ma and 417 ± 5 Ma, respectively.•Notable hydrothermal modification and mineralization have been identified with partly primary magmatic Po-Pn-Ccp assemblage changing to Py-Mlr-Ccp assemblage.•Au and Cu seem to have been redistributed by hydrothermal fluids at a larger scale than Ni.