Laserfiche WebLink
<br />Tresler suggested for Wyoming that 4 to 6 inches of topsoil should be replaced <br />over 24 to 36 inches of subsoil for native grass production in low <br />precipitation regimes and 4 to 6 inches of topsoil over at least 36 inches of <br />subsoil for production of deeper rooted crops in higher precipitation regimes. <br />When overburden has properties that may retard plant growth, the soil must be <br />managed so that the root system is not exposed to these harmful properties... <br />Although the ultimate textural composition of the waste rock piles is unknown <br />at this time, it is fair to speculate that the pile will be predominantly <br />coarse rock fragments with some finer sized particles interspersed. The <br />Division does not share the belief that the <br />uppermost lift of a normal waste rock pile is a suitable plant growth medium, <br />or that in this particular project, the mine waste rock is superior to the <br />resident subsoils the native vegetative communities have been inhabiting. <br />Additionally, as presented in EXHIBIT I - SOIL RESOURCES, the Division would <br />like to note that the subsoil of the Blackhall Gravelly Sandy Loam (5-15% <br />slopes), covering approximately 60% of the Project Area, was identified ~.d'S <br />brown loamy sand to fine sandy subsoil; the top 24 inches of soil was <br />identified as suitable plant growth medium except in shallow bedrock areas. <br />Additionally, the subsoil of the Uracca-Morvall Complex, (15-50% slopes), <br />covering about 25% of the Project Area was identified as a weathered sandy <br />clay conglomerate; the upper 18-24 inches of material was identified as <br />suitable growth medium, except in areas where bedrock is very shallow. <br />Therefore, please commit to replacing a total depth of 18 inches of <br />topsoil/subsoil, to provide adequate depths of water- and nutrient-holding <br />plant growth medium to facilitate successful vegetation establishment and <br />continued growth. <br />Section E.3.3 Heap Leach Facilities <br />Section E.3.3.1 Cyanide Neutralization <br />75. The Cyanide neutralization results were not included in in Appendix I. <br />However, Appendix F.3, Heap Leach Goechemical Laboratory Test Results, <br />presents geochemical data of ore and rinsed ore. Is this the information <br />meant to be included in Appendix I? Should the coverletters presented in <br />Appendix I be transferred to Appendix F.3 and delete Appendix I a ltogether? <br />Please clarify. <br />