In 1880, however, borax ​ — a white crystalline compound used in the manufacture of soap and other products — ​ was discovered in Death Valley, leading to the most successful mining period in the valley’s history.
ولغاية سنة ١٨٨٨ ،‏ كان البورق يُنقل الى خارج الوادي في عربات .‏