Thar'Ga in federation systems

Thar’Ga / Tai’Kin  is in Cobalt Mines , Striped Deposits and Felony Border

There is also one in Stripped Deposits, despite that making no sense.

36 minutes ago, Elusif said:

There is also one in Stripped Deposits, despite that making no sense.

That is for “Kill Thar’ga in Jerry sectors”

It still shows the mission marker for the federation mission.

I search all sectors and only one question mark is in cobalt mines but when i kill this thar’ga my quest is still unfinished. Can someone tell me what to do?