Laserfiche WebLink
NEWMONT <br /> GOLDCORR <br /> 6 PRECIOUS METALS RECOVERY FACILITY <br /> The existing precious metals recovery facilities include the Arequa Gulch Absorption, Desorption <br /> and Recovery (ADR1), the Squaw Gulch ADR (ADR2) and the refinery, which is included in the <br /> ADR1 complex. ADR1 is located on the south side of the VLF1. ADR2 was constructed pursuant <br /> to Amendment 10 to provide gold recovery from pregnant solution from the VLF2. No change to <br /> either facility is anticipated as part of this Amendment 13. Pregnant solution generated as part of <br /> VLF2 Phase 3 will be pumped to ADR2 for recovery. Both facilities are shown on Drawing C-2. <br /> 6.1 Chemical Usage at ADRs <br /> The same chemicals currently permitted for use will be used in the ADRs as part of this <br /> Amendment 13 and are described below. <br /> Activated carbon is used in the adsorption process to pull gold from solution and reactivated, as <br /> needed, by burning at high temperatures using the reactivation kiln. The activated carbon is be <br /> shipped in bags and stored outside of each ADR building. <br /> Hydrochloric acid is used in a dilute form to remove scale that builds up on the carbon from the <br /> pregnant solutions and is disposed by neutralizing with sodium hydroxide and adding to the <br /> makeup water for the barren solution. Acid is delivered by tanker trucks to each ADR and is stored <br /> in a fiberglass reinforced plastic mixing tank located within concrete containment. Acid tanks are <br /> equipped with an acid scrubber to remove acid vapor that would be released during filling or tank <br /> expansion due to high ambient temperatures. <br /> Sodium hydroxide is used to neutralize hydrochloric acid solution prior to reuse of the water for <br /> makeup water and is used to maintain the pH levels above 10 during carbon stripping. Sodium <br /> hydroxide is delivered by tanker trucks and stored within concrete containment area in a tank of <br /> approximately 20,000 gallons. <br /> Sodium cyanide is used in a dilute solution to pull gold from the carbon during carbon stripping <br /> and is added to barren solution to dissolve gold during heap leach operations. Once the gold is <br /> removed by electro-winning, the dilute sodium cyanide solution is recycled as barren solution. <br /> Sodium cyanide is delivered in liquid form by truck to the site in USDOT-approved containers. <br /> The containers are positioned on an unloading area which is surrounded by a concrete <br /> containment berm and is adjacent to the ADR buildings within lined areas. The solution is <br /> transferred from the containers into storage tanks that are within the containment. <br /> Cripple Creek&Victor Gold Mining Company Exhibit D <br /> Cresson Project Amendment 13 <br /> 22 <br />