The Operator Information Report at RAS indicates that Albert Sommers, co-sponsor of the resolution, has a permit to graze livestock on public lands managed by the Pinedale Field Office, authorization #4915862.
Go to this page for an overview of his ranch.
The Allotment Information Report ties the authorization to three BLM allotments, shown in the following map from the National Data Viewer (click on image to open in new tab).
The overview mentions grazing on the Upper Green River Allotment of the Bridger-Teton National Forest, which is not covered by the NDV, but you can find it on the Western Watersheds map.
The Allotment Master Report provides management status, acreage and active AUMs.
The nearest wild horse area is the Desert HA, last gathered in October 2001.
Unfit for free-roaming equids, it is well-suited to privately owned livestock, despite considerable dietary overlap between the two species.