Established as a cow calf operation over one hundred years ago, the Mill Iron remains a working cattle ranch. At one time the Mill Iron had the largest registererd Hereford herd in North America. Well-know for its Colorado Domino bloodline, the Mill Iron was rigorous in its breeding and consequently had some of the most sought-after bulls in the Southwest. To this day the Mill Iron continues to raise Hereford, and more recently Red and Black Angus cattle.
Even though cattle continue to be a focal point for the ranch, conservation stays at the fore front of mind. Purposely, the ranch is under-stocked in order to balance cattle and wildlife. Texas Parks and Wildlife recently recognized The Mill Iron for its conservation efforts by awarding the ranch with the Lonestar Land Steward Award.