The Golden Spike visitor center is built with iron quartzite and rare copper quartzite, which is mined only in China and here in nearby Park Valley, Utah. Now, between 50,000 and 75,000 people visit each year. Though there is no longer a train station or ticket office in Promontory, the visitor center serves as a gateway to the history of one of the most significant events in the American west. Nearly all visitors at Golden Spike come here to see exhibits, view films, watch ranger presentations, and shop in the bookstore.