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WATER INFORMATION EXHIBIT G <br />1. General Area Discussion <br />The area where the Revenue Mine is located is known as Yankee Boy Basin, bound by the St. <br />Sophia Ridge, Mt. Sneffels, Cirque Mountain, Teakettle Mountain, Potosi Peak, Stony Mountain, <br />and Camp Bird. The broader general area is located on the north edge of the San Juan Mountains. <br />As discussed in the introduction, the Silverton - Ouray - Telluride bounded area of the San Juan <br />Mountains is the result of repeated uplift and collapse of a pair of calderas several million years <br />ago. <br />The portion of Yankee Boy Basin where the mine is located drains into Sneffels Creek, a year <br />around flowing contributor to Canyon Creek and eventually the Uncompaghre River. The elevation <br />drops from 10,600' (Revenue Mine) to 7800' (Garay, CO) over a course of five and a half miles. <br />Sneffels Creek is fed by runoff from snow melt on the neighboring peaks as well as rainfall during <br />the summer months. Due to altitude, the area around the Revenue Mine is under snow from early <br />October to early June in many years. The upper portions of the Sneffels Creek Basin are up to <br />14,000' elevation and a significant portion of the basin is above timberline, although it has been <br />affected somewhat by the presence of many old mines that are considerably higher in elevation than <br />the Revenue Mine. <br />Ground water and surface water have been monitored at the Revenue Mine for several decades. The <br />bulk of this monitoring has been related to the Revenue discharge, but data for the abandoned Atlas <br />Mine discharge as well as data for various surface water samples is available. However, since the <br />bulk of the historic mining took place well before any environmental protection practices were in <br />place, there is no truly pre -mine water quality data available. All data reflects the water quality as <br />impacted by historic mining activities. <br />Much of hydrological discussion in this exhibit is based on data from the Revenue - Virginius Mine <br />monitoring, samples data from recent monitoring for this permit, and the Colorado Department of <br />Public Health and Environment (CDPHE) Water Quality Control Division's (WQCD) records for <br />Revenue Mine August 2012 G -1 <br />