The incident will begin on or about July 20 according to the news release.
The capture and removal goals are 700 each.
The current population is thought to be 809.
A helicopter will push the horses into the traps.
Operations will not be open to public observation with the exception of those escorted by BLM staff.
Animals not put down in the field will be taken to the off-range corrals in Palomino Valley.
There are no plans to treat any of the mares with fertility control pesticides and return them to the range.
The roundup supports three tenets of rangeland management.
Western Horse Watchers Association 