1997-03-26_REPORT - M1977378 - Laserfiche WebLink

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February 1997 Monthly Report Page 3 - Longfellow - Koehler Cont Test results were received on the red precipitate layer found in the pond and under the Koehler dump. It appears that this material has the potential to release zinc to water when exposed and lower pH. This layer may be pre-mining or at least a pre-Koehler dump deposit based on the dump materials position over the layer with no intermixing. After receipt of the results, it was determined that this layer should be removed. Excavation and stockpiling for haulage was started in February. The time extension request submitted in January for the Section 404 Permit held for this project was granted and received from the U.S. Army Corps of Engineers in February. No samples were taken in February. - London Mine Portals - Waste Dumps This is a "B List" project. Therefore, no work, permitting or arrangement for access is planned until it becomes evident that the work plan for this project requires implementation. - Pride of the West Tailings Status of this site has not changed from the December monthly report although all information has been submitted to DMG for approval to place the historic tailings into the permitted onsite tailings pond. - Sunnyside Mine Pool Mitigation - Alkaline Solution Injection During the month of February, this project was inactive with no alkaline material or water being injected. The water pool pH at the American Tunnel bulkhead on February 14, 1997 was 4 .76 and the bulkhead pressure was 245 psi. Sunnyside will continue to monitor these parameters through the winter. - Cement Creek Diversion and Water Treatment Cement Creek diversion and water treatment was active continuously through January. The entire flow of Cement Creek was diverted and treated along with the portal flow from the American Tunnel.