17th Chemical Engineering and Catalysis World Forum,London, United Kingdom

26th 21st International Scientific GeoConference SGEM 2021,Varna, Bulgaria

1st International Conference on Mining and Mineralogy,Munich, Germany

2nd 8th International Conference on Mining, Material, and Metallurgical Engineering (MMME’21),Hlavni Mesto Praha, Czech Republic

25th 8th International Conference on Computer Science, Engineering and Information Technology (CSEIT 2021),Toronto, Canada