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• e All but one of the soils in the mine permit area belong to the <br />soil order Mollisols. <br />Mollisols <br />Some general characteristics of the Mollisols are that they are <br />mainly the very dark colored, base-rich soils of the steppes. <br />Nearly all of them have a mollic epipedon. Many also have an <br />argillic or a natric horizon or a calcic horizon. A few have an <br />albic horizon. Some also have a duripan or a petrocalcic <br />horizon . <br />Many of the mollisols have had a grass vegetation at some time, <br />although many apparently have been forested at an earlier time. <br />Mollisols may have any of the defined moisture or temperature <br />regimes, but enough available moisture to support perennial <br />grasses seems to be essential (1). <br />• The following soil series located on the mine permit area are <br />included in the mollisol soil order. <br />Soil Series Classification <br />Routt Loam Cryic Paleboroll, fine, montmorillonitic <br />Skylick Loam Pachic Paleboroll, fine-loamy, mixed, cryic <br />Lymanson Argic Cryoboroll, fine-loamy, mixed <br />Splitro Lithic Cryoboroll, loamy, mixed <br />Winevada Pachic Cryoboroll, fine-loamy, mixed <br />Royal Variant Unkno wn <br />All of the above mollisoils belong to the suborder Borolls. <br />Borolls <br />Borolls are the cool to cold, more or less freely drained Mollisols <br />of regions that have continental climates. They are very ex- <br />tensive on the northern Great Plains of North America and <br />• moderately extensive in the high mountains of the western <br />states. <br />