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The paper presents a 3D model of ore bodies of the Sin Quyen iron oxide copper-gold deposit in Lao Cai province, North Vietnam. To build 3D model we used the computer software MineScape and archival geological, geophysical data recorded from 146 boreholes, 21 tunnels and 216 trenches, including the data obtained from chemical and neutron instrumental activation analysis of 50 ore samples collected in 2015 year. The modelling process was composed of three stages: first was checking and validating of the input data, second was data processing and the last building 3D model. The model shows that the ore bodies extend below level of -300 m, such information will be used for future exploration. Based on the obtained model, the reserves of selected metals were calculated and equal to 570 000 tonnes for copper and 190 tonnes for uranium. The obtained Cu reserve is comparable with that estimated and published in the archival report of the Vietnam Geological Department.

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Samples collected during the KGHM PM S.A. program Go Global Internship were used in these work to develop a mineralogical model of all zones in the Sierra Gorda deposit. Reflected light microscope observation and quantitative microchemical analyses show that thedeposit is characterized by high variability of all parameters. The major mineral within the oxides zone is atacamite. The following other minerals have been identified: malachite, brochantite, chryzocolla, sampleite, paratacamite, brushite, antlerite, aubertite, montmorillonite and kaolinite. The major minerals in the sulphide zone are chalcopyrite, covellite, molybdenite and pyrite. The minor and accessory minerals are bornite, arsenopyrite, pyrrhotite, sphalerite and galena. Substitution of Cu in rock-forming minerals as well as inclusions of Cu and Mo sulphides within silicates will play an important role in the recovery of both metals.