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BATTLE MOUNTAIN RESOURCES, INC. <br />ADEQUACY RESPONSES - ADDITIONAL INFORMATION <br />PAGE 4 OF 7 <br />V is the flow velocity, S is the channel slope, and SG is the specific <br />gravity of the riprap material. The specific gravity is assumed to be 2.64. <br />This method was chosen for riprap selection because both channel gradient <br />and flow velocity are considered in the determination of dso• <br />20. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />21. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />22. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />23. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />24. The comment was satisfactorily addressed in the January 9, 19910 submittal. <br />25. Please provide additional information on the monitoring requirements for <br />the tailings embankment and disposal process. This information should be <br />included in the monitoring report discussed in comment I1. In addition, <br />please provide a clearer description of the assumptions used in D.6-17. <br />The assumption for friction angle for the tailings embankment materials <br />should be verified through a Laboratory test of shear strength. (Note: Jim <br />Pendleton with the Division contacted Rob Dorey on January 17, 1990 and <br />requested that the )aboratory test be conducted.) <br />A comprehensive report of all monitoring to be conducted at the San Luis <br />Project is currently being prepared and will be submitted upon completion. <br />Attachment 2 contains a discussion of the assumptions used ire Figure 0.6- <br />17. <br /> BMR will commit to testing of the tailings embankment material for shear <br /> strength and su bmitting the data to the Division for r eview an d approval <br /> at least 60 day s prior to commencement of embankment c onstruct ion. <br />26. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />27. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />28. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />29. The comment was satisfactorily addressed in the January 9, 1990 submittal. <br />30. Please provide a wind erosion plan for periods of shut down or temporary <br /> cessation. <br />During periods of unexpected shutdown wind erosion will be controlled by <br />recirculating water through the tailings spigots or utilizing the water <br />trucks present on site, as necessary. Should temporary cessation of the <br />mining activities occur, a plan for temporary stabilizat~~on and wind <br />erosion control of the tailings will be submitted to the Division for <br />