Digging into Death Valley's lesser known history SFChronicle
May 3, 2019 . But borax proved the area's most profitable mineral, and its history and . For more stories like this, check out The Chronicle's weekly Travel newsletter! . the machinery at the Harmony Borax Works was fed a near constant.
Interior Secretary Zinke announces mining ban north of Yellowstone .
Oct 8, 2018 . Interior Secretary Zinke announces mining ban north of Yellowstone. By Michael Wright . Freddy Monares/Chronicle. Zinke Signing . Lucky Minerals plans to begin drilling on private land near Emigrant Gulch next year.