**7. Conclusions**

We investigated the magmatic–hydrothermal system recorded by a porphyry Cu–Mo deposit in the Erdenet area of northern Mongolia. The characteristic features of the vein systems are as follows.


**Supplementary Materials:** Complete microprobe analysis used to calculate of Ti-in-quartz and Ti-in-biotite Geothermometers are available online at http://www.mdpi.com/2076-3263/10/5/201/s1.

**Author Contributions:** N.T. conducted the fieldwork and contributed to discussions during the manuscript preparation. G.A. prepared the samples and obtained petrological and geochemical data by EPMA, assisted by M.U., who also evaluated the data. A.O. assisted with the SEM–CL and fluid inclusion study. G.A. wrote the manuscript, supervised by N.T., A.O., and M.U. This paper is part of the first author's Masters project. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by SATREPS project by JICA-JST.

**Acknowledgments:** We thank Gerel Orchir, Baatar Munkhtsengel, and Batkhishig Bayaraa of the Mongolian University of Science and Technology for kindly providing us with samples from Erdenet and the surrounding area and for assistance with geological fieldwork.

**Conflicts of Interest:** The authors declare that there is no conflict of interest that could have influenced the work and results of this paper.
