It is Alameda Slim's hideout where he and his nephew triplets, the Willie Brothers, reside and where they harbor numerous stolen cattle. Echo Mine used to be Lucky Jack's former home where he and many other jackrabbits used to live for many generations, until Slim drove them all out and then made the mine his hideout. Mr. Wesley later arrives at Echo Mine by train to claim the 5,000 stolen cattle, but the cattle are eventually liberated by Maggie, Grace, Mrs. Calloway, Buck and Lucky Jack. Mr. Wesley, the Willies and Rico (a fake bounty hunter who has been covering up Slim's tracks) are then beaten up by Buck, Lucky Jack and the farm cows, and they lock the bad guys in a mine cart. The mine is most likely left vacant and abandoned after that.
