The Alberhill District is characterized by rolling terrain, vacant land, and the newly constructed Alberhill Ranch neighborhood. Much of the topography in the central areas, east and west of Lake Street, has been substantially altered as a result of the Alberhill District's long history of extractive/mining activities. Mining operations in the Alberhill District began at Terra Cotta roughly the same time the region's first railroad, the California Southern Railroad, was completed in the 1880s. A spur of the railroad originally built to Terra Cotta was extended into the central portion of the Alberhill District. The Atchison, Topeka, and Santa Fe Railroad built a line up from Corona through Alberhill to Elsinore after the line through Railroad Canyon was washed out in the 1920s. These events helped shape the growth of the District. Mining operations for coal and especially clay have continued to exist since the late 19th century, and occupy a significant portion of the Alberhill District. Through the years, Pacific Clay Products Company has purchased the local mines and has become the sole operating clay mine in the region.