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L~ <br />1.A.3 Distinctive Characteristics of Rhyolite <br />' In comparison to other stone products with potential architectural value, rhyolite has a number of <br />unique attributes. It can be cut cleanly without cracking or flaking. The color range of the stone <br />is extraordinary and includes beautiful shades of lavender, red, pink, brown, and grey. Rhyolite <br />' is resistant to weathering. All of the chazacteristics have contributed to the demand for rhyolite <br />as a distinctive building and landscaping material. <br />' 1.B Zoning of the Property <br />' The property is zoned Agricultural-1 ("A-1 "). Mining operations are specifically listed as uses <br />permitted by Special Review in this zone. <br />' 1.C Proof of Ownership <br />Refer to Appendix 2 for copies of the Winkler Lease Agreement and CMI's Deed documenting <br />' proof of ownership. <br />1.D Impact on Adjoining Property <br />The impacts to adjoining property are addressed in Section 3.H of this report. <br />' 1.E Compliance with the Comprehensive Plan <br />' The Douglas County Master Plan addresses urban development for the County. It does not <br />specifically mention goals and policies for mineral extraction. Those items aze addressed in the <br />Master Plan for Mineral Extraction completed in 1990. The plan states Douglas County's policy <br />' concerns and regulatory approach to mineral extraction. <br />The following outlines compliance with the Master Plan for Mineral Extraction. The elements <br />' are explained in more detail in other sections of this report. <br />1.E.1 Geology <br />Rhyolite is an extrusive welded tuff of volcanic origin. It is comprised of approximately 74% <br />' silicon dioxide, 6°,'o potassium oxide, 4% sodium oxide, and a host of accessory minerals such as <br />zircon, sphene, and magnetite. The color range is from grey to tan to various shades of red or <br />pink. It is a finc grained glassy rock with a few lazger crystals distributed throughout the rock. It <br />is a very durable rock, resistant to weathering. <br />The rhyolite deposit formed approximately 35 million years ago in the early Oligocene geologic <br />' age. The deposit formed when a volcano erupted and blanketed ash on the surrounding land. <br />After the ash •.vas deposited, it consolidated, forming rhyolite rock. It subsequently eroded and <br />only exists as a covering on a few local mesas. <br /> <br />