Looking at Great Salt Lake brine spec:The Great salt Lake...

Looking at Great Salt Lake brine spec:

The Great salt Lake Mineral Company, which is located on the Great salt Lake just west of Ogden, Utah, began operations in 1970 and produces potash fertilizer (K SO.), halite
2 (NaCl), salt cake (Na2S0,), and MgC12 brine
from Great Salt Lake brine. Based on 1991-92 data, the lake brine intake at GSLM had ion concentrations of 0.4% K, 8% Na, 0.7% Mg, 14% Cl, and 1.5% SO..

Looks similar to LD at K=0.5%, Na=8%, Mg=0.7%,Cl=18%,SO4=2%

Moreover Great Salt Lake operations much more weather dependent.

From the report in item 3

MR is aiming for 6.5%K harvest at 70% recovery K. This is less than hoped for but well above the 4.8%. As evaporation is effectively free assume evaporation ponds would need to be adjusted in size.