From the Burger King in Moab, drive SW along Hwy 191 7.4 miles to a junction with the La Sal Loop Road. Drive up the La Sal Loop road for 12 miles, then take a dirt road on the right towards Geyser Pass. Drive on this for 5.55 miles and take a right onto a smaller dirt road. Follow this another 1.65 miles to the end. In winter, the road is plowed to a plowed parking lot just before the junction with the Gold Basin Road.
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This is a great winter or summer route. It will be described as a winter route here (since that was when I was there), but it is great in summer. You will need to read the topo map; there is no trail. Ski or snowshoe the Gold Basin Road a short distance to the NW ridge of peak 12,271. Peak 12,271 (UTM 126253079E 4258013N) is your objective. This will be the toughest part of the climb, getting on the steep ridge and to Peak 12,271. I would advise and ice axe and crampons. Make sure to stay on a ridge to avoid any avalanche danger. Once on peak 12,271, follow the ridge north to Mellenthin. This is a great climb. Gonzo climbers can try both Peale and Mellenthin in one day in winter from this route, but most climbers will be happy with doing one peak in a day. This is a beautiful climb in winter, and it's great in summer too. The Geyser Pass route can be descended by those who want a loop trip.
West face of Mellenthin.
Ice axe, crampons, snowshoes or skiis in winter.
In summer take a good pair of boots.