Sanuarach Mine (Quest)

Walkthrough
Upon reaching Karthwasten for the first time, the Dragonborn will witness a discussion between Atar and Ainethach.

It seems that Atar and his group of mercenaries have been "generously" hired by the Silver-Blood Family to protect the mines from the Forsworn.

It's up to the Dragonborn to either convince Atar to leave with his band of thugs or Ainethach to sell the mine to the Silver-Blood Family.

Regardless of who the Dragonborn helps, persuade or intimidate the other and report back to whoever the Dragonborn agreed to help for a 1200 gold reward.

If Atar is talked to first (and pick his pocket for 250 septims), then Intimidate Ainethach into selling, the 1200 septim reward can be received from Atar. Killing Atar and his men and then reporting back to Ainethach will reward the Dragonborn with another 1200 septims.