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<br />BOETTCHER GYPSUM QUARRY--LIMITED IMPACT PERMIT 77-346 <br />NOTICE OF INTENT TO CONTIidUE QUARRY OPERATION <br />IDEAL BASIC INDUSTRIES, INC., CEMENT DIVISION <br />LARIMER COUNTY, COLORADO <br />This small quarry continues intermittent operation to supply <br />the Boettcher cement plant with about 18,000 tons of gypsum per <br />year. The attached map bcc-1367 is marked to indicate disturbed <br />area since the 1976 permit, which has now been expanded to most <br />of the permitted nine (9) acres. <br />The exposed, most available upper gypsum beds on Ideal's <br />480 acres of property interest at this location are now almost <br />depleted by half a century of quarry operations. Quarry experience <br />and extensive exploration drilling indicate the lower lenses of gyp- <br />sum cannot be accurately delineated due to variable lenses that <br />can pinch out suddenly. Removal of these lower lenses is especially <br />unpredictable due to varying degrees of contamination and inter- <br />bedding with shales and siltstones. <br />A cin-rent operation into these lower beds on the permit area <br />has started more or less on an experimental basis to determine if <br />acceptable quality can be maintained by screening out the unwanted <br />materials which air slack quite rapidly. <br />With information now being assembled, a study will indicate <br />within the next year or two whether conversion from limited impact <br />to a regular permit or a new source will be the most feasible. <br />If the experimental screening operation should prove favorable, <br />an increased amount of fines with gypsum contamination will be avail- <br />able for backfilling depleted quarry areas and augment the limited <br />topsoil available for reclamation. <br />U~. z, G~dllti~rll~i <br />R. E. Marsh <br />Properties Manager <br />October 8, 1981 <br />