Bullion King is a quick out-and-back trail that offers big views. It runs parallel to the beginning of the iconic Black Bear Pass and ends at the mouth of Porphyry Basin, where the Porphyry Basin Mine once stood. Though Bullion King is a straightforward, non-technical drive, with no obstacles, drivers should be aware of a significant stretch of dangerous, narrow shelf road. Keep an eye out for oncoming vehicles on the shelf and note places that provide an opportunity for passing, because it is a single vehicle-wide road. At the trail's end is a parking area for the Porphyry Basin Trailhead that takes hikers up and around several small alpine lakes, including Bullion King Lake and Porphyry Lake.