Harmony Borax Works- We stopped at the Harmony Borax Works, a historic borax mine from the early 1900's. They called borax the "white gold" of Death Valley and mined it for use in laundry soap and lots of other things. This is where the "20 Mule Team" logo became famous on some soap powders. They used 20 mule teams (the actual amount of mules tended to vary) to haul the borax from the mine to market.