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l <br />MINING OPERATIONS <br />Method <br />Sand and gravel mining operations across the country vary widely <br />in the methods used for extraction. This is due to topography <br />of the site, depth and thickness of the gravel deposit, height <br />of the water table, quantity and rate of material extraction, <br />equipment availability, and other considerations. <br /> All Flatiron mining operations are open pit excavations. The <br /> procedures and equipment used, are as follows. <br />,i 1. Scrapers are used to remove the topsoil and to expose the <br /> aggregate below. <br /> i <br /> 2. Because the aggregate is mined dry a backhoe is used at th <br />s <br /> stage. The backhoe will dig a dewatering trench around the area <br /> to be mined. <br />~' 3. At this time a pump is placed in the down stream end of the <br /> dewatering trench to keep the pit dry. <br />i 4 <br />d <br />h <br />i <br /> . Two p <br />to remove t <br />e <br />eces of earth moving equipment are use <br /> aggregate. A front end loader is used in conjunction with a scraper. <br /> Once the scraper has been filled by loader the aggregate is either <br /> carried to the crusher or stockpiled for future use. <br /> 5. In modern operations, the reclamation process is simultaneous <br /> with the mining operation. Using the topsoil and other overburden <br /> removed before the mining process, the ground surface is shaped <br /> into final contours reestablishing land forms or creating new land <br /> forms for future use. <br /> NOTE: The procedures shown above are used in one form or another <br /> in all of our o <br />erations <br /> p <br />. <br /> B-1 <br />