Laserfiche WebLink
Page 2 <br /> It is important to consider that these numbers represent <br /> potentials , rather than field measured values . In order for <br /> acidity to be generated a weathering process must function. <br /> The processes responsible for acid drainage generation have <br /> been shown to be driven by biological agents, namely: iron <br /> oxidizing bacteria. If these bacteria can be controlled <br /> there is no reason to believe that acid would be generated . <br /> A bactericide trade named ProMac and manufactured by B.F. <br /> Goodrich is being investigated for reclamation of tailings <br /> at the Sunnyside Mine. This material has been highly <br /> recommended to us and we would propose using it on the waste <br /> rock dumps to preclude acid drainage generation in lieu of <br /> lime . Some descriptive literature is attached . <br /> Iron, manganese, and to a lesser extent, lead and zinc <br /> values shown for the AB-DTPA extracts are relatively high <br /> for the core analyzed. These data however do not reflect <br /> the chemical conditions to be found in a weathering waste <br /> rock pile, rather they attempt to predict available metals <br /> in the root environment. Batch, paste extract, or column <br /> leach tests would provide more informative numbers , but if <br /> acid is not generated by the weathering of the metal <br /> sulfides these metals will not be found in solution. By <br /> inhibiting acid formation through the use of ProMac, <br /> dissolved metal transport in acid drainage should be <br /> precluded . <br /> Therefore, the program proposed for mitigating acid drainage <br /> generation in the permanent waste rock stockpiles is to <br /> 1) place them in areas away from sources of disturbed area <br /> runoff (see Exhibit C-1 , Amendment No. 3) ; 2) build <br /> diversion ditches and contour the piles along the <br /> waste/slope interface in order to direct upslope runoff away <br /> form the pile surface; 3 ) slope the upper surface of the <br /> piles to prevent ponding; and 4) utilize ProMac (or other <br /> equally suitable) bactericide to stop the acid generating <br /> process . The rock dumps will be formed of coarse material <br /> which will be free draining and no saturated zone is <br /> expected to develop. <br /> Conditions For Approval Nos . 4 through 6 will be addressed <br /> as progress is made. <br /> Mayflower Exploration Adit: <br /> Questions raised on the Mayflower exploration plan are <br /> presented in the following question and response format. <br /> Question No. 1 : Please provide a location map of Arastra <br /> Creek. The site is just off of Map B submitted with <br />