- Tubal Cain Trail starts about 25 miles south of Sequim and leads to the remains of historic Tubal Cain and Tull city copper and manganese mines along with views of the Olympic Mountains, Copper Creek Valley, and a handful of high mountain peaks. There are camping areas available along the way after leaving the Silver Creek Shelter. Please us existing campsites when possible. The trail is 8.6 miles in length and ends at the junction with Big Quilcene Trail #833 at Marmot Pass (6000 feet). Pack and saddle stock are permitted. Motorized vehicles and mountain bikes are not.