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<br />' Thirty-five potential volcanic locations in Douglas County have been mapped by the Colorado <br />Geological Survey; not all of them contain rhyolite. Of the 35 locations, only seven of them <br />' have potential economic value. Of these seven, two have been depleted, two have developments <br />built on them and one has developments surrounding the resource. Except for the Castle Rock <br />Quarry resource, the remaining rhyolite deposits would be too expensive to develop given their <br />' size, the cost of permitting, the cost of developing transportation access, and excessive <br />overburden removal. The existing CMI Ditmazs operation is the only remaining quarry <br />supplying rhyolite in Douglas County. The deposit will be completely depleted in 1996. <br />3.A.3 Demand for Rhyolite Aggregate <br />' Demand for rhyolite is tied to specific uses and cannot be equated to a per capita consumption as <br />other aggregates can. The historical demand for this product from the Ditmazs Quany is perhaps <br />the best and only basis for measuring the demand. Rhyolite is the only Douglas County source <br />of stone, coarse aggregate, crusher fines, and specification road base. <br />' In addition, demand for a variety of rock products is present, whether or not there is a coazse <br />aggregate source. Table-3.A.3(1) indicates product demands. <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br />Table-3.A.3(1) -Product Demands <br />MATERIAL USAGE <br />6" Stone decorative stone, walls, building stone <br />12" Stone decorative stone, walls, building stone <br />18" Stone decorative stone, walls, building stone <br />24" Stone decorative stone, walls, building stone <br />36" Stone decorative stone, walls, building stone <br />3/4" Rock leach field rock, water line bedding material, <br />1 1/2" Rock leach field rock, water line bedding material, <br />Crusher Fines roadway surfacing, horse industry, bike paths <br />Class 6 Road Base roadway surfacing <br />Class 5 Road Base roadway surfacing <br />Fill Material horse industry, building backfill <br />Class 1 Structural Fill foundations, bridges <br />' 13 <br />