2019-12-13_REVISION - M1980244 (60)

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Spill • . CountermeasuresNEWMONT •r the Cresson Project SUstainability & ExternalRelations Any spills will be contained inside of the ADR-1 building itself, or within the VLF-1 lined system. Delivery trucks are staged on a concrete pad west of the plant.This unloading and storage area are protected by bollards to prevent accidental collisions between trucks and storage tanks. Mixing of chemicals takes place either inside the ADR-1 plant or within the tanks located outside the building on the west and north sides. Storage of non-regulated chemicals and reagents in the quantities shown in Table 6b are within the chemical storage area, within operating systems, and within pipes, pumps, and other appurtenances as further described below: Sodium Hydroxide(NaOH)- NaOH liquid is stored directly west of the ADR-1 in a 20,000-gallon tank within concrete secondary containment and within the tertiary containment of the lined area of the VLF-1.The concrete containment sump is equipped with a float-activated pump that would return fluid to the plant circuit in the event of a release.A release outside the concrete containment would remain on the VLF-1 liner and migrate north toward the main liner system. Hydrochloric Acid(HCL)-HCI liquid is stored directly west of the ADR-1 in an 8,200-gallon,double-walled tank within concrete containment and within the lined area. Releases outside the tank containment would flow north, completely contained within the liner. Antiscalant-Antiscalant liquid is not a hazardous chemical. It is stored in various locations at the ADR-1 Plant in poly-plastic 600 to 8,000 gallon capacity single-walled,foam-insulated tanks.The ADR-1 is located on liner that drains to the VLF-1.Antiscalant is also stored within the VLF-1 in poly plastic insulated tanks various sizes(see Table 6b for container sizes). Release of Antiscalant should be controlled, even though the residue is not hazardous.Complete removal of impacted soils is not required. Contaminated soils may be placed on the VLF-1 if desired. 4.5.3.2 Process Reagents at the ADR-1 Plant and VLF-1 The ADR-1 Plant uses process(minerals beneficiation) reagents to recover precious metals from the ore.The location of the ADR-1 Plant is identified on Figures 2 and 6.Specific details for the ADR-1 facility can be found in Table 6a and Table 6b. Diluted cyanide leach solution (typically 0.01%to 0.02%or 100—200 ppm) is directed to and from the VLF-1 through an HDPE/steel piping system. Pregnant lines are steel and barren lines are steel/HDPE depending on location. 4.5.3.3 Spill Prevention for Process Reagents VLF-1—Dilute cyanide leach solution (typically 0.01%to 0.02%or 100—200 ppm) is directed to and from the VLF-1 through an HDPE/steel piping system. Pregnant lines are steel and barren lines are steel/HDPE.The pipelines are also equipped with an automatic shut-off,triggered by flow or pressure differentials. In the unlikely event that solution drains or sprays off liner,spill response procedures described in Section 5.0 of this Plan should be followed expeditiously. Pipes, drip lines,and conveyances that direct cyanide solution to and from the VLF-1 are generally installed 15 feet between the conveyance and the edge of the liner. CC&V may also affix pieces of synthetic liner on the side of flanges and valves facing the edge of the liner to reduce the chance of off-pad spraying should a leak develop. Bulk Cyanide Delivery,Storage,and Handling-The facilities for mixing, unloading, and storage of cyanide are located within the security perimeter of the mine, physically distant(2-5 miles)from any dwellings or communities.CC&V is supplied with liquid cyanide which is off-loaded cyanide to CC&V's solution storage tank. The storage tanks are both fitted with audible high-level alarms,and tank levels are monitored remotely by process operators in the ADR-1 control room. During cyanide delivery,trucks are staged on a concreted pad sloped to a sump within the containment for the stationary storage tanks.The cyanide storage tanks are located within a dedicated concrete impoundment;the - _ ------p.. - - .. _.w__. -------- _-- ---- ----- -------- _ ---- _ _-.. ---------- Department THIS DOCUMENT IS UNCONTROLLED IN HARDCOPY FORMAT Doc Id:NA CCV-SER-PLAN- 1930 ------ ------- -.._._._--_- -- ---- _. -- ------ --------- -------- ------- ------- - ---- --------- ----------.. .-------.---,