i have and to access it you have to have passed tourist trap, as you need 2 keys, once you've completed the quest and got the keys needed get a slaves shirt,robes and boots and go through shantay pass and south to the desert mining camp (check Map)enter the house and go down the ladder, u will start by a gate, to get through the second one you need you slaves uniform, and then to get through the next one get in the mine cart and travel to the end of the narrow tunnel then use ur wraught iron key on the third gate and vola, just be careful of enemies.