It was a phone interview with the Chief Geologist. It lasted about 45 minutes. He asked about my education, work experience, and my expectations regarding the role, for example how could I fit in their team. And was also some questions about my previous salaries, and what would I expect now. There was no math question.

There was an online virtual interview where you are asked a series of technical and HR style questions, After successful completion, this was followed by an in person interview at their office.