Dissemination of the new technologies brings the new challenges in business of the mining and metallurgical companies, as well as the care of accepting changes by the employees. This paper deals with an analysis of impact the digital technology development in the mining and metallurgical companies in Serbia. The research methodology is focused on measuring and interpreting the digitalization by the qualitative and quantitative methods. The research findings show how the business of mining and metallurgical companies is transformed into a digital age and provides everything that is needed to combine the mining and metallurgical processes with a new technology for sustainable development.

This work proposes a methodology for adopting a strategy in mining and metallurgical companies during the Covid-19 pandemic. For this purpose, the AHP analysis is recommended as an instrument for formulating the optimal business models. Selected business models are the most desirable for solving the preventive strategy of mining and metallurgical companies. The methodology of the work shows the applicability of the proposed model for solving the real problems caused by the Covid-19 pandemic.

Among ecological solders the SIAC (silver-indium-tin-copper) alloys seemed to be the promising because of their properties. In this paper the results of Ag-In-Sn-Cu electrical conductivity measurements are performed as well as polynomial regression of the same. These results are obtained for different temperature regimes and conditions.