Mongolian oil explorer Petro Matad Ltd announced Monday that Executive Director Amarzul Tuul has left the company with immediate effect, citing personal reasons.

However, she will continue to work for the company as a consultant and will remain Petro Matad’s appointed representative at the Mongolian Petroleum Exploration and Production Association.

Shares in Petro Matad were down 2.2% at 10.38 pence on Monday.