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MINING PLAN <br />• The Martin Marietta silica property is zoned A, agricultural. As <br />stated in the Boulder County Zoning Resolution, Section VII, oil drilling, <br />quarries, mining, sand and gravel operations and similar extractive land <br />uses are permitted. <br />The mining plan for Martin Marietta silica Quarry, located one mile <br />southeast of Lyons, Colorado is .very straight forward. The quarry, <br />operated by Loukenon Brothers of Lyons, Colorado, was purchased .in 1974 <br />from the Loukenon Brothers. At present 6.5 acres are opened up and will <br />be expanded to a maximum of 10 acres. Avery small .portion of the operation <br />is located on Loukenon property. This portion of the area is where a crusher <br />and stockpile area are located. <br />The mine is located on a moderately steep side hill with only 0 to 8 <br />inches of soil over the Dakota sandstone formation. This sparce soil is <br />dozed off. with a dozer and the sandstone is exposed. Mining is done in <br />20 foot horizontal benches proceeding west into the hillside. Since only <br />20,000 tons are mined each year, the advancement is very slow. <br />The following diagram describes the method of mining. <br />C1 <br />Typical Cross-Section <br />3" diameter holes are drilled on a 3 ft. by 3 ft. pattern. The <br />sandstone is then blasted out of the hillside. The ore is transported <br />to the crusher by a 3 c.y. loader and aided by a dozer. Once the material <br />is crushed at the mine site, it is transported to the Martin Marietta <br />Cement Plant one mile east. <br /> <br />