Show 237 degree of density only common salt precipitates other sub- stances precipitate at higher or lower densities From two to five inches of 995$ pure salt may thus be deposited in the evaporating ponds during the summer months Salt deposited in this manner is plowed up and stacked in large piles where it is allowed to weather until needed From these huge piles the weathered salt is taken to the refinery to be converted into various sizes and grades Annual salt production from the lake is approximately 80000 tons This is about 1 of the nation’s total production® It is estimated that the lake water and deposits along its shores contain enough salt to supply the world’s needs for a thousand years There are other Great Salt Lake industries having a potential future value One of these is centered around deposits of natural asphaltum seeping from the lake bed near Rozel In 1940 three companies were operating wells in that "Trestles run out into the lake dotted with rigs storehouses and camps” vicinity the shore is Relative in- - and Brighton "Salt Making on the Great Salt Lake" Journal of Chemical Education March 1932 407 and Royal 19 T Salt Co B Salt np Brighton "Salt Making on the Great Salt Lake" 407 21 WPA Yriter’s Project Utah A Guide to the State 20 125 22 Ibid 124 |