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Description <br />Jan <br />Feb <br />Mar <br />Apr <br />May <br />Jun <br />Jul <br />Aug <br />Sep <br />Oct <br />Nov <br />Dec <br />Yr. <br />Temperature <br />( °F) <br />Rec. High <br />56° <br />54° <br />61° <br />65° <br />80° <br />82° <br />85° <br />83° <br />80° <br />72° <br />66° <br />56° <br />85° <br />Avg. High <br />31° <br />34° <br />39° <br />46° <br />57° <br />68° <br />72° <br />70° <br />63° <br />52° <br />38° <br />31° <br />50° <br />Mean <br />17° <br />19° <br />25° <br />32° <br />42° <br />50° <br />55° <br />53° <br />47° <br />37° <br />25° <br />17° <br />35° <br />Avg. Low <br />3° <br />5° <br />11° <br />19° <br />27° <br />33° <br />38° <br />37° <br />31° <br />23° <br />12° <br />4° <br />20° <br />Rec. Low <br />-27° <br />-38° <br />-30° <br />-17° <br />7° <br />19° <br />26° <br />23° <br />8° <br />-7° <br />-24° <br />-31° <br />-38° <br />Precipitation <br />(inch) <br />Precipitation <br />0.7 <br />0.8 <br />0.9 <br />1.1 <br />0.7 <br />0.9 <br />1.7 <br />2.0 <br />1.1 <br />0.7 <br />0.8 <br />0.8 <br />12.2 <br />Snowfall <br />18 <br />18 <br />21 <br />24 <br />8 <br />2 <br />0 <br />0 <br />2 <br />10 <br />19 <br />19 <br />143 <br />Precip. Days <br />9 <br />8 <br />10 <br />10 <br />7 <br />6 <br />12 <br />14 <br />9 <br />6 <br />9 <br />9 <br />109 <br />The Leadville Mill <br />M1990-057 <br />EXHIBIT B — SITE DESCRIPTION <br />Page 3 -2 <br />Average annual precipitation is 12.2in. The wettest year was 1957 with 22.1in and <br />the driest year was 1994 with 8.8in. The most precipitation in one month was 4.9in <br />in January 1996. The most precipitation in 24 hours was 2.1in on December 24, <br />1983. Average annual snowfall is 143in. The most snowfall in one year was 248in in <br />1996. The most snowfall in one month was 63in in February 1995. <br />TABLE 3 -1: CLIMATE DATA FOR LEADVILLE <br />Source: Western Regional Climate Center <br />3.2 REGIONAL GEOLOGIC SETTING <br />The Mosquito Range, the study of whose geological structure formed a necessary <br />basis for that of the ore deposits of the Leadville region, is the western boundary of <br />the South Park, and has thus been considered from a topographical standpoint to <br />form part of the Park Range. Geology shows, however, that in Paleozoic times the <br />boundaries of the depressions now known as the Parks were formed by the Archean <br />land masses of the Colorado Range on the east and of the Sawatch and its <br />continuation to the north, the Park Range on the west, and that the uplift of the <br />Mosquito Range did not occur until the close of the Cretaceous. <br />Prior to this uplift the various porphyry bodies, which now form a prominent feature <br />among the rock formations of the region, were intruded into the sedimentary beds <br />deposited during Paleozoic and Mesozoic times, spreading out between the beds and <br />sometimes crossing them, but being most uniformly distributed at the top of the <br />Lower Carboniferous or Blue Limestone. It was in this limestone that the greater part <br />of the ores was deposited, and the original deposition must have taken place after <br />Version 1.0 April2013 <br />