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Page II <br />incorporate aspects of the three scenarios depicted in Figure 3-1. Also influencing the plan view <br />`~ <br />~ extraction in the first panel are the caverns or sections of caverns which will not be recovered be- <br />cause of halite intrusion. <br />3.2 Cave Development <br />Figure 3-2 shows the caving concept included in the mine plan submitted as part of the <br />Environmental Impact Statement. A similar cave development is anticipated with the new higher <br />extraction mine plan. The bulking of the caved material will inhibit the ultimate development of <br />the caved zone. The height of the caved zone is controlled by the height of the mined seam (the <br />height of the solution cavity) and the bulking factor. For Scenario a of Figure 3-1, the cavern <br />height might be as high as 63 ft and be partially filled with insolubles. From Table 2-1, the <br />equivalent nahcolite thickness (maximum) is 45.1 ft, hence, the nahcolite thickness (maximum) <br />removed from an isolated cavern such as in Scenario a (Figure 3-1) is 45.1 ft (assuming no bulk- <br />ing of the insolubles). In this case, with a bulking factor of 1.3, a cave would develop up about <br />150 ft above the dissolution surface. For the other scenarios, the height of the cave development <br />1 would be proportionally less. For example, with a bullring factor of 1.5 for both the insolubles <br />and caving rock, the height of the caving zone would only develop up to 50 ft above the dissolu- <br />tion surface. <br />Agapito <br />