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I <br />CashMineWaterMonitoring AddanBrown <br />' 2.7 Mining <br />The Cash Mine is an underground gold mine that currently extends to a depth of 668 feet below ground <br />level. The mine has been developed on nine levels, at an average vertical spacing of approximately 70 <br />' feet. <br />Development of the mine to date has been along two ore-bearing veins: the Cash Vein, and the Freiburg <br />Vein. These veins are sub-vertical, trending approximately NE-SW, and they converge at the eastern end <br />of the mine. Sections along each of these veins are presented in Plate 5. <br />Mining has been performed in general by the overhand cut and fill method. The vein orebody is removed <br />' by blasting the back and face, and the void created is backfilled with waste to form the platform for <br />further extraction. Where there is insufficient waste for backfilling, the stopes were left open. <br />The proposed mining at the site will continue this mining strategy, possibly utilizing cemented paste <br />backf ill for stope filling. <br />1 3. MONITORING PLAN <br />3.1 Basis <br />' The monitoring plan is proposed to identify the quality of surface water and groundwater at the Cash <br />Mine before, during, and after the currently-proposed operation. The purpose of monitoring at the site is <br />' to identify any impact to water resources occasioned by the construction, operation, and closure of the <br />mine. <br />3.2 Surface Water <br />3.2.1 Monitoring Locations <br />' Surface water will be monitored at two locations downstream from the Cash Gulch mine: <br />3.2.1.1 Cash Gulch <br />Cash Gulch will be monitored at SW-1 (Plate 4). This location is below the mine workings, both surface <br />and underground, and accessible by road. At this location Cash Gulch is generally damp or dry, with <br />' flow in and after precipitation or snowmelt events. A permanent marker will be erected at the sampling <br />location, comprising a cairn or post beside the gulch, sufficiently above the stream thalweg to be above <br />flood flow level. <br />3.2.1.2 Unnamed Gulch <br />The unnamed gulch to the east of Cash Mine will be monitored at SW-2 (Plate 4). This location is below <br />' the mine workings, but above the southern mine access road and above the County Road. Both of these <br />roads have the potential to impact the water quality with sediment and snow control materials. At the <br />sampling location the unnamed gulch is generally dry. A permanent marker will be erected at the <br />sampling location, comprising a cairn or post beside the gulch, sufficiently above the stream thalweg to <br />be above flood flow level. <br />11 <br />1601A-20061106 3