Warren didn't keep his agreement with Dunn. On his way to the claims office, Warren stopped in a saloon, got drunk, and gambled away the grubstake given him by Dunn and the others. He went to Fort Huachuca and recruited additional backers from Tombstone. On September 27, 1877, 56 days after Dunn located the Rucker Mine, Warren filed a claim for the Mercy Mine up Mule Pass Canyon from Iron Spring. Over the next six months his name is mentioned either as the locator or witness in several other claims in the Tombstone Canyon and Mule Mountains and established what became known as the Warren Mining District. He held a one-ninth interest in the new Copper Queen mine.