MARIPOSA COUNTY, Calif. (KSEE24) – You may not realize it when you see this sign off Highway 49, but the Mariposa County Fairgrounds is the gateway to California Gold Rush history. “So a lot of people ...

Add Yahoo as a preferred source to see more of our stories on Google. Ben Mossman, chief executive of Rise Grass Valley, on the grounds of the closed Idaho-Maryland mine in Grass Valley, Calif.

Rare-earth elements, a group of 17 metallic elements, are integral to the production of many technologically advanced tools and devices. “The average person would be blown away by how much we interact ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. MARIPOSA COUNTY, Calif. (KSEE24) – You may ...

Five years ago, Canadian mining executive Ben Mossman came to this little Gold Rush town in the Sierra Nevada foothills, planning to strike it rich. His company bought the abandoned Idaho-Maryland ...