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Wally Erickson <br />June 28, 2010 <br />Page 18 <br />Data to be Replaced New Data <br />Table C-3, USGS Field Leach No field leach test undertaken. <br />Test See SPLP analysis Table 3, Appendix <br /> 1B. <br />Table C-4, SPLP Metal Analysis Table 3 (Synthetic Precipitation <br /> Leachate Precipitation), Mine Rock <br /> Analysis (Appendix 1 B) <br />28-8. Section 63.3(1)(i). Table C-5. Please ensure that the analyte list is complete and <br />consistent with the recommendations of comment (1) above. <br />Response to Adequacy Issue No. 28-8: All surface and groundwater analyses will <br />be undertaken in accordance with the recommendations in 1) above. <br />28-9. Section 63.3(1(i). Table C-7. More information is needed on the origin of the <br />sample labeled "Mine adits ". Please indicate whether the sample is discharge from <br />the mine adit, standing water in the mine, seepage from mine walls, or something <br />else. <br />Response to Adequacy Issue No. 28-9: The three samples described in Table C-7 <br />were taken from the spring beneath Idaho Idaho Adit No. 1. This sample location has been <br />re-interpreted as the Idaho Seep. Data in this table will be replaced by data contained <br />within the following tables in Appendix A: Tables 2 (Dissolved Metal Concentrations), 3 <br />(Total Metal Concentrations) and 4 (Surface Water Chemistry). <br />28-10. Section 6.3.3(1)(i), page 6. Please clarify the statement: "Groundwater monitoring <br />wells will not be completed or used for monitoring if water is not is encountered 10 <br />feet below the surface level of the La Plata River. " <br />Response to Adequacy Issue No. 28-10: This statement was based on an internal <br />memo prepared by Mr. David Bird and directed to Ms. Kate Pickford dated February 1, <br />2007. In addition, a recently found a permitted well within the Idaho Permit Area (Well <br />Permit 64335, Appendix D) that is completed at an elevation of approximately 8,700 feet. <br />In the future Well 64335 will be used a groundwater monitoring and a compliance point. <br />28-11. Section 63.3(1)(i). Please elaborate on the "adit drainage discharge point. " Is <br />this current discharge? Is it expected to continue during and after mining? What is <br />the current flow rate? If sampling has been performed, please indicate which of the <br />attached analytical reports is for the discharge.