Near Antioch in Contra Costa County, California — The American West (Pacific Coastal)
The Independent Shaft was sunk in 1865. By 1867 the company had failed and the shaft became inactive except as a means of pumping water from the neighboring Eureka Mine. Pittsburg Mining Company eventually purchased the property and returned the shaft to service as a working entry around 1900. Within a short time - probably no more than a year - the shaft was permanently abandoned as high production costs, the availability of higher quality coal from Washington Territory, and the advent of oil as an industrial power source ended mining on the ? (Mt Diablo Coal Field?)
Erected by East Bay Regional Park District.
Location. 37° 57.514′ N, 121° 51.807′ W. Marker is near Antioch, California, in Contra Costa County. Marker is on Somersville Road. Touch for map. Marker is at or near this postal address: 5175 Somersville Road, Antioch CA 94509, United States of America.
Other nearby markers. At least 8 other markers Mount Diablo Coal Field (within shouting distance of this marker); Somersville Townsite (about 400 feet away, measured in a direct line); Greenhouse Portal (approx. ¼ mile away); Sidney Flat (approx. 0.9 miles away); Black Diamond Way (approx. 4 miles away); The Growler Saloon – Goethals Building (approx. 4.1 miles away); The Clayton Post Office (approx. 4.1 miles away); The Joel Clayton House (approx. 4.1 miles away). Touch for a list and map of all markers in Antioch.
More about this marker. This marker is located on the west site of the parking lot located at the southern end of Somersville Road in Black Diamond Regional Park.
Categories. • Industry & Commerce •
Credits. This page was last revised on June 16, 2016. This page originally submitted on April 4, 2016, by Barry Swackhamer of San Jose, California. This page has been viewed 152 times since then and 28 times this year. Photos: 1, 2. submitted on April 4, 2016, by Barry Swackhamer of San Jose, California.