2023-09-07_REVISION - M1990057 - Laserfiche WebLink

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Burns Figa&Will 2 September 5,2023 Step 2: Cyanide Handling CJK acknowledges the hazards related to CN as well as other chemicals. The handling and use of these chemicals are common in mining operations, and its safe use to the environment and human safety is highly regulated by State (Colorado Department of Reclamation Mining and Safety-CDRMS, Colorado Department of Health and the Environment-CDPHE)as well as federal (Mining Health and safety Administration-MSHA). Cyanide will be destroyed, and metals of concern will be treated using the lime used in the milling process. CJK is required by law to comply with regulations associated with the handling and use of hazardous materials and will use these industry-proven methods. The cyanide management plan is highly regulated by CDRMS and must be approved before operations can commence. Updated cyanide and emergency management plans will be included in the revised permit application which will be completed by the end of February, 2024. Step 3: Cyanide Destruction Most of the CN used in the process is reclaimed and re-used. However, the CN that cannot be reclaimed will be destroyed using ferric sulfite prior to disposal in the Filtered Tailings Deposit (FTD). The cyanide detoxification process is an industry-proven method. CN concentration in the FTD will be at a safe level. Step 4: Filtered Tailings Disposal Detoxified tailings will be filtered to remove most of the water. The filtered material, moist like beach sand, will be stacked and compacted on a shallow slope. This design is stable. Further, since the material is not liquid, as contained in a conventional tailings facility, it will not travel more than a few feet in the unlikely event a portion of the facility experiences a slump. The FTD design is prescriptive and must be approved by CDRMS before operations can commence. Step 5: Containment Sump The Leadville Mill is designed as a zero-discharge facility. The entire facility is designed to be within a series of primary sumps to capture and contain leaks should they occur. In the unlikely event the primary sumps are overwhelmed by a spill, the liquids will flow directly into the secondary containment sump. The facility design allows all liquids to report to the primary and secondary sumps via gravity flow, so there is no risk of spillage caused by pump failure. The Primary sumps are lined to contained liquids. The secondary sump is doubled lined and also has leak detection and leak capture should the primary liner fail. In the event that liquids report to the secondary sump, milling operations will stop and the detoxification system will be used to immediately detoxify the water. Therefore, there will be no long-term sump containment of cyanide water. Step 6: Dust Control Dump material is generally damp. Nevertheless, the material surface will often be dry and dust control measures as required will be implemented. Roads will also become dusty. Roads will be sprayed with dust surfactants and water. Trucks will be covered during transportation. Material will be sprayed with water prior to loading in the crusher bin. The crusher facility will be an enclosed building with negative air pressure created by a dust collector. The material will be wet from the time it is introduced in the ball mill until it is deposited on the FTD. Water sprays as well as contemporaneous reclamation of the FTD will control dust from the tailings.