1988-01-04_INSPECTION - M1977378 (2)

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tailings line. Other surface drainage from the mill site will continue to flow to the "duck pond" . Question: 7. The chemical storage building is almost complete. Interior concrete berms were not poured with the foundation. Chemicals stored (Sodium hydrosulfide, Sodium cyanide, lime, etc. ) outside on pallets in a bermed area awaiting transfer into the shed, are in a direct path of an avalanche run. These materials should be moved ASAP, especially prior to the next snowfall . Response• The newly erected reagent warehouse at the Mayflower Mill will only be used to store 50 pound bags of hydrated lime. Reagents such as Sodium cyanide and Sodium hydrosulfide are stored within the mill building. Following delivery, small quantities of these reagents may be stored outside for less than 48 hours until loader time is available to move them into the mill . This was the case during the October 28 MLRD inspection. The area in which the reagents are temporarily stored is off the north end of the facility; and it does not lie in an avalanche path, but rather to the north of one. Question: 8. Tailing Pond #1 toe adjacent to the state highway is eroding - sediment being carried into road drainage system. These areas require stabilization to minimize disturbance to the hydrologic balance. Please discuss. Response: The face of tailings pond no. 1 will be sprayed with a soil cementing agent in the spring of 1988 as soon as field conditions will allow. A test spraying of the upper surface of TP no. 1 was conducted in July 1987 with Wen-Don' s CPB-12 dust control agent. An agent with sufficient durability to require one annual treatment is being sought. This agent, once selected, will be used during the spring 1988 spraying of the outslope of TP no. 1 .