2017-11-06_REPORT - M1980244

• Permit No: M1980244
• IBM Index Class Name: Report
• Doc Date: 11/6/2017
• Doc Name: Spill Report
• From: CC&V
• To: DRMS
• Email Name: TC1
• Media Type: D
• Archive: No

Approximately 20 plus cubic yards of soil were transported by the front end loaders to the tailings
stockpile, located near the load out bin (LOB). The soil was mixed into the tailings.
• The small amount of slurry in the secondary containment was rinsed to the sump and cleaned out
(photos 3 and 4)
• The over -excavated areas were filled in with clean fill and gravel (photos 5 and 6).
b. Any known or adverse impacts to human health, property or the environment
No impacts to human health or the environment were observed or are expected to occur due to the
chemical composition of the neutral pH water and the low volume that was spilled. Furthermore, the spill
occurred on a lined area, thus prevent any environmental impacts.
c. CC&V Contact
For any further information regarding this event please contact;
Justin Bills
Senior Environmental Specialist
PO Box 191,
100 N 3rd St,
Victor, Colorado, 80860
Work: 719-6894046
Cell: 719-306-3388
Fax. [phone]
d. Monitoring and analyses that are necessary to evaluate the situation and corrective actions
Sampling is not necessary because the chemical composition of the neutral pH water is well known. The
neutral pH water consists of a mixture of water that has been recirculated from the float circuit and raw
feed water that is added to the mill as make up water. The float reagent is generally consumed in the float
circuit, the float reagent bonds with the gold bearing float concentrate, thus leaving trace amounts of float
reagent in the neutral pH water. A sample of the process water was taken after the August 101' spill, the
analytical results are attached.
e. Results of the Operator's investigation
On October 25'x', the HGM control system was being upgraded and the HGM was down for most of the
day to make the necessary upgrades. The root cause of the spill was an oversight in reviewing the new
pump control program prior to startup of the HGM. The control system has safe guards in place to prevent
spills like this from occurring; however, the system was overridden and placed in manual mode instead of
Auto, for testing. With the system in manual mode, the pumps were not able to maintain tank levels
when the HGM was brought back online.