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• 4.2.3 Corporate Office <br />WRN reports to North American Chemical Company at Trona, California with main offices in <br />Overland Park, Kansas. <br />4.3 New Findings or Developments <br />4.3,1 1997 Operation Results <br />Mining and production activities were continuous in 1997, other than planned shut downs <br />for maintenance. <br />A summary of mining and process results are as follows: <br /> Av. Assay Assay Tons Tons Tons <br /> (gpm- Temp NaHCO3gll NaCI g/l cavity#2 cavity #3A cavity#4 <br />Jan 699 178 102 62 2433 0 3042 <br />• <br />Feb 598 185 106 66 2268 0 2451 <br />Mar 745 183 101 71 2806 0 4323 <br />Apr 788 182 95 84 1731 0 3972 <br />May 737 181 98 89 1783 0 3290 <br />June 632 190 95 90 1406 0 4197 <br />July 695 186 92 116 1683 0 3217 <br />Aug 764 188 93 111 1546 301 2923 <br />Sept 832 189 89 95 504 2521 2805 <br />Oct 849 190 97 72 0 3215 3222 <br />Nov 785 191 101 66 0 3099 3310 <br />Dec 652 183 110 59 0 4207 2795 <br />Key to above headings: <br />Av. - (gpm) - monthly average injection flow rate during process operations <br />Temp. -temperature in degrees F recovered at the preg tank <br />Assay - g/I sodium chloride or sodium bicarbonate in the composited recovery liquor <br />Tons -total monthly bicarb production without adjustments per cavity <br />• 16 <br />