This post took some time to locate and visit. I saw a few images of this place from a youtube video titled "BayAreaWandering" and thats all I had to work with. After lots of homework the location finally found its way to me.
History: Now know that this place has been abandoned since 2002 or around that time frame. 1905 is when the factory established their first yard. The yard was about three-quarters the size of town in which its located. This place earned revenue of $300,000 in Capitol Stock. Mr. B along with two others were the main directors. In the beginning they used horse-drawn snappers to mine the clay to mix with more clay which was transported from Lincoln California. In 1908 the company merged with another East Bay City to distribute their products under the name, well I cannot tell you that lol. Over the years the factory gained more business and well as time took over the business was sold and permanently closed in 1998. The plants were dismantled and plans are supposed to be underway to restore the property to its natural state.
This site was well maintained and on the farthest side of the yard there were small buildings with employees inside them. Not sure if security is something to be worried about since the site is located in a county park but hey you never know. Here is the yield so enjoy:
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