Long the key exploration player offshore Mauritania, London-based Tullow Oil will quit the country early next year when it’s only remaining license, shallow water Block C-3, expires.

In its 1H results, released 24 July, Tullow wrote off $29mn of past exploration costs at C-3 which expires in “early 2020” as well as announcing that it had recently withdrawn from its other license, C-18, where it had 15% alongside Total (45%op), BP (15%) and US firm Kosmos (15%). It’s...