From the trailhead, a trail leads north to NW on the east side of the creek for about ½ mile before it begins to fade. Before entering a forested area, cross the creek where the trail comes very near to it and head up an open slope, not too steep, staying near the edge of the forest. After about 400 feet of gain, head into the forest and work your way through the forest into the upper basin of West Brush Creek. You may at times see something of a trail in here. Pass along the foot of a rock glacier where more trail may be evident and eventually intersect the creek and continue along the drainage, to the end of the trees, hopefully finding a trail again that also heads NW to a saddle between White BM and a minor 12er of 12,728 to the south of White. Follow this trail to the saddle between White BM and UN12,728. Most of this upper basin hike will be on the faint trail and tundra. Wildflowers abound all around here, especially a very red variety of paintbrush.
Once at the saddle, turn north and begin following the ridge crest to the summit. Along the way you'll encounter a few rock outcrops. At one particular outcrop, the droppings left behind by mountain goats are a couple of inches deep. Keep your eye out for them. Continue up the ridge that gradually turns to more rock & small boulder rubble. Finish on the rocky summit. Contemplate the trip over to White Rock Mountain if you wish, but be warned, it's a difficult traverse. Descend by the same ridge, or shortcut your descent by heading more directly down the SE face by one of several scree slope opportunities. Many more wildflowers to be seen here.
It should be noted that the trailhead for this hike can also serve as a TH for Teocalli. A trail which does not show on either the USGS quad, or the Guinnison NF map, heads east from the parking area to the south ridge of Teocalli ("Teocalli Ridge" on the USGS map) and crosses the ridge at 11,100 ft. Head north from that saddle for an easy Class 2 hike to the summit on a trail that eventually fades away below some minor cliff bands.