In ages long past, dwarves delved throughout the Misty Mountains and there drew forth precious ore from the land. At the foot of those mountains, beneath the shadow of what is now called Mount Gram, is one such delving - The Delving of Frór.
Long before the Men of Rhudaur made the land now called the Ettenmoors their home, the dwarves who lived there carved deep beneath the mountains. The Delving of Frór was mined to exhaustion and abandoned for many years until the Men of Rhudaur arrived and themselves discovered its depths. The Men of Rhudaur eventually fell under the sway of the Witch-king, and Angmar demanded that they build subterranean holdings meant to serve as defenses against the forces of Cardolan and Arthedain. The Rhudauran complied, and built small holdings in the abandoned mines.