This wall is home to more than a half-dozen routes generally ranging from 3 to 5 pitches in length. Expect great variety: techy face climbing, corners, and cracks of all sizes. This area holds shade and can be chilly, but it is a good spot on warmer days and for solitude. Great views of the valley and the workings of Bonnie Springs Ranch down below (make sure to be quiet as voices will carry all the way down to the ranch). A single 70m rope is adequate for any of the routes here.
The Mustang Wall is the far north by north-eastern aspect of the Monument, but it has a different approach: From the Black Velvet parking lot head due north across the desert, eventually reaching the bottom of a long, broad ridge that gradually narrows and ultimately leads to a small gully below the right edge of the wall. As you continue up the ridge you will eventually come across cairns which will funnel you towards the easiest path. Cut right at the top of the ridge to a gully filled with white talus and scramble up this a short distance to the bottom right side of the wall itself. It is possible to use the Monument approach and then follow the cliff line all the way around to this wall but it is not easy and is much more time consuming.