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The starting point is that the court must adopt the Board <br />of Adjustment's decision if there exists a rational basis for <br />the interpretation and then examine whether the interpretation <br />is consistent with the purposes of the zoning laws. There is <br />no claim here that the interpretation is in conflict with <br />prior interpretations. <br />B. The Nature of Mineral Extraction Operations Require <br />Special Treatment. <br />At the outset, it is important to note the distinction <br />between permitted uses, conditional uses and nonconforming <br />uses. Permitted uses are those uses which are allowed as a <br />matter of course in a specific zoning district. Conditional <br />uses are those uses which, while necessary in a society, <br />cannot be allowed to be established in a district without <br />special conditions attached to their existence. Nonconforming <br />uses are uses which are in existence at the time a district is <br />created but which are not in,harmony with the characteristics <br />of the district. The establishment of such uses after a <br />district is created may be absolutely prohibited or be made a <br />conditional use. In the case of mineral extraction <br />operations, these are conditional uses in the A-2 Agricultural <br />District and also in the A-1 Agricultural District by virtue <br />of sec. 10.12(2)(a), D. C. Ords. <br />Mineral extraction operations are dusty and noisy <br />operations which on that basis alone cannot be given the <br />status of permitted uses. They are, however, uses which are <br />necessary and must be located somewhere, therefore, Dane <br />County has made them conditional uses in both the A-1 and A-2 <br />Agricultural Districts. Mineral extraction operations in <br />existence at the time of regulation by the Dane County Zoning <br />Ordinance were grandfathered by being made nonconforming <br />-7- <br />