The following directions revised 2018 per Eddie Mack:
From the east end of the town of Silverton, where the main, paved road splits, go straight and make your way toward the cemetery. Accessing Boulder Gulch from County Road 2 and the tailings at the Mayflower Mill is no longer allowed. From just behind and above the cemetery locate a road that heads ENE near some utility lines. Follow that road east for about a mile to a locked gate at 9,600 ft. elevation. This will be WNW and above the Mayflower Mill tailings. There is only enough parking room here for about three vehicles. The road is not rough or steep, but a higher clearance vehicle is desirable because of mud-filled ruts.
There is no legal camping in the immediate vicinity. If in need of a camp spot for the night, try driving further up along the Animas to around Howardsville where a large open, rock-strewn field has become the summer domain of a multitude of RV's, campers, etc. Or, north of Silverton on HWY550, drive up along the South Fork of Mineral Creek road and search out an at-large spot. Summer competition for campsites, especially on weekends, makes finding a quiet, private spot difficult. You can find additional camping possibilities to the south at Molas Lake and Little Molas Lake.