During several years Cambria was a booming mine town, and prospectors flooded the area. More than 150 claims were filed in the early 1870s. The most successful of these claims, the Oceanic Quicksilver Mining Company, at one time employed 300 and was the largest mine in the area and the sixth largest in the world. Three furnaces were built, seven tunnels completed, and their stock price jumped to $30.00 per share. Hopes were high, and Cambria residents dreamed of imminent wealth. Unfortunately, by 1878, mercury prices started to fall and Cambria's first economic boom ended. As mercury prices fluctuated, Cambria's mining thrived and dwindled. During the boom of 1876, $282,832 worth of quicksilver was produced; four years later, production had decreased to only $6,760. A devastating fire in 1889 virtually ended the mercury business and Cambria settled into a quiet dairy community.