The aim of the thesis was to develop a usable mobile application prototype to be used in the underground mining environment. In order to fulfill the aim, the research question How can a mobile application be designed for usability with focus on operability for an underground mine? was researched, analysed and answered. The main methods for driving the design process were ISO 9241-210, Human-centred design for interactive systems, requirement en- gineering and conceptual design. The results of the thesis were based on qualitative data, collected from semi-structured interviews from five respondents. These respondents had a background as a operator in underground mines in different countries. The qualitative data was analysed and interpreted into functional and non-functional user requirements. The user requirements in parallel with design principles were used to produce a final con- cept that would be transformed from a low fidelity into a high fidelity prototype. The high fidelity prototype was developed using Android Studio, Java and later tested and evalu- ated using SUS questionnaire and usability heuristics to rate the overall usability of the application . The answer to the research question lied in the methodology used in this the- sis. This was achieved by involving the stakeholders, people affected by the future design in the entire process, with different methodology during the different phases of the design process.