1989-12-01_REVISION - M1988112 (4)

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acid is used in the gold-loaded carbon wash and what is its concentration? {Pages D-14 and D-15 contain identical text 7. Pg. D-16: How will the gases and vapors from the heated and pressurized desorption vessel be controlled? Will any emi:sions into the atmosphere occur? What quantities of sulfuric acid ai-e anticipated to be used within a year's time of operation? Whai; concentrations will be used and how will the acid be transported? How is the volatilization of cyanide controlled? Will such emissions into the atmosphere occur? What is the guarantee the.t "in the event of a tank rupture or leak, all solutions are collected and contained within the mill"? 8. [D.6.1] How will the tailings material be contained if a storm event with a magnitude beyond the "probable maximum precipitation event during operations" occurs? The surface wai.er and groundwater of the project area and vicinity (which includes the Town of San Luis, the town's water supply, and the Vega) could be severely damaged. 9. [D.6.1] What is the concentration of cyanide, acids, or other chemicals in the slurry-form tailings? 10. Pg D-19: "The site is located in an arroyo tributary to Culebra Creek and is not located within the Rito Seco drainage' IS A FALSE STATEMENT. The site IS in the Rito Seco drainage. The Fito Saco contains a diversion which eventually leads into the Culebra Creek after traversing the length of the Vega. Culebra Creek is located about four miles from the BMG mill site. 11. Pg. D-20: Given the extreme consequences of the Towr of San Luis being only 3 miles downstream, the "100 year 24 hour stormwater diversion ditch system around the tailings disposal area" is not adequate. The possible damage to the town's drinking we ter supply (the aquifer) cannot be tolerated. The location of the tailings disposal area looks good only on paper. The consequences of this plan could be catastrophic. 12. Pg D-21: A single 40 mil plastic liner beneath the disposal area is a dangerous gamble with the health and well-being of the San Luis community. A triple liner system or greater over a clay substrate should be required. A leak monitoring system between each of the liners should be installed. The system should be e~hut down once a leak through the first layer is detected, until it is repaired. 13. Pg D-22: The water pools constitute an extreme danger to water fowl. The plan makes no mention of netting over any of the ponds or pools. The prevention o£ wildlife accessing these areas also must be insured. Such precautions must be implemented. -2-