Bedded trona (Na2CO=-NaHCO=.214,0) in the lacustrine Green River Formation of Eocene age in the Green River Basin, southwest Wyomin~ constitutes the largest known resource of natural sodium carbonate in the world, in this study, 116 gigatons (Gt) of trona ore are estimated to be present in 22 beds, ranging from 1.2 to 11 meters (m) in thickness. Of this total, 69 Gt of trona ore are estimated to be in beds containing less than 2 percent halite and 47 Gt in beds containing 2 or more percent halite. These 22 beds underlie areas of about 130 to more than 2,000 km: at depths ranging from about 200 m to more than 900 m below the surface. The total resource of trona ore in the basin for which drilling Information is available is estimated [...]
