The Black Diamond Mines Regional Preserve is a 6,000-acre park featuring trails and relics from mining towns. It is popular for its tours, which take school-aged children and members of the public down a long stairway, deep into one of the mines to learn about coal and silica-sand mining, as well as local history.
Black Diamond Mines Regional Preserve is on the U.S. National Register of Historic Places and is a California Historic Landmark.
For improved safety and visitor experience, the East Bay Regional Park District tasked the Syblon Reid Construction team with removing the existing wood stairs into the mine and replacing them with new metal stairs. NV5 provided geotechnical engineering services related to stairway design, anchor bolting, and tunnel roof stabilization for this important public-facing project.
The new stairway connects the mine from the upper observation point to the lower mine entrance.