Long but informative (~3hrs). Initially gave a short presentation and was interviewed by a group of senior company members. Questions included a mix of technical understanding and personal reasons I wanted the job/where I wanted to be if I got the job etc.. Next had a tour of their campus at followed by a ~45min desk based task revolving around geological mapping. Finally was interviewed in a more casual environment by junior company members. This also gave me the opportunity to ask questions about life at the company. Overall a good experience.