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could cause runoff bearing sediment but that has not been observed. No chemicals are stored outdoors except for explosives which are kept in magazines. Portable generators and compressors are situated outside but these have attached enclosures. The only thing to guard against is fuel and lubricant spills. No processing or milling occurs on these sites. The historic mine drainage is as before described and simply soaks into the dump. The small flow doesn't exceed the permeabil- ity of the dump so it does soak in before leaving the site. Humid- ity is quite low so some evaporation also occurs. There are no tailings ponds. There is little dust generated. Everyday wastes are disposed of in drums which are period- ically taken to a waste disposal facility. As before noted, ore is stockpiled on the dump and period- ically loaded out for shipment to the mill or to the smelter. Waste rock is disposed of by placing it on the face of the dump. Waste is ordinarily unmineralized or slightly mineralized rock so it contributes little to acid generation. c.) Preventive Maintenance - The mixing of mine drainage and runoff from stormwater is negligible because stormwater runoff has been essentially nonexistent. Nonetheless, a plan already exists to guide whatever runoff may occur from the dump (which is not paved and is permeable) into a settling pond. The low flow mine drainage (2 or 3 gpm) could go into the same pond which would be lined with reactive leonardite or another reactive medium to trap dissolved metals and the filtrate allowed to go to groundwater. The material (soil and rock) underlying the 6 Level dump area is colluvium and the mine drainage is going into it anyway. colluvium, with its clay content, is a metal trap anyway and is probably fil- tering and precipitating whatever metals are being leached from products of mining activity. Before the mine entry was made, what- ever groundwater filtered through the mineralized structures in what is now the mine had to also eventually percolate to the sur- face largely through this colluvium or fractures and other perm- eability zones in the underlying volcanic rocks. Fuel and oil storage vessels are continually monitored for leaks and are replaced or repaired whenever such are noted. Equipment is monitored for fuel and oil leaks and hoses are replaced, seals tightened or replaced, and other leaks repaired as required. d.) Good Housekeeping - The disposal of trash or garbage and reduction or elimination of fuel and lubricant spills are the prin- cipal housekeeping chores at this operation. The common trash accumulations are kep in covered steel drums which are periodically hauled to a trash disposal site. Old mine timbers and similar burnable materials are accumulated and period- ically burned when conditions permit. Pfuch of this timber must be dried before it can be burned. Building materials are either stored for later use or hauled to disposal. (4.)