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Show Modern Mining Methods Mark Trona Production The most modern mining methods mark the production of trona at Westvaco, Wyoming site of Green River's great new chemical Industry. Every possible operation Is automatic, including automatic operation of the high speed hoist that brings the trona to the surface for refining at the mine mouth. Mining of trona is practically identical with the modern methods of coal mining, so that the coal miners of Sweetwater county move Into the trona mine without having to learn new methods of mining machinery operation. Interesting to many people Is the method of holding the mine roof in place. Instead of the use of mine familiar to so many people, Sropi. e more modern method of bolting the roof Is used. Long bolts are placed In the rock formations overhead at regular Intervals, and then locked Uto place, so that the strles of bolts actually bold the overhead buulen in one solid piece and prevent H fx oca failing. ... |