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2021-09-27_REVISION - M1990057
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2021-09-27_REVISION - M1990057
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Last modified
1/12/2025 2:02:19 AM
Creation date
9/27/2021 4:35:44 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1990057
IBM Index Class Name
REVISION
Doc Date
9/27/2021
Doc Name
Adequacy Review Response
From
The Union Milling Contractors
To
DRMS
Type & Sequence
CN1
Email Name
DMC
Media Type
D
Archive
No
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Mr. Dustin Czapla 19 <br /> CDRMS <br /> September 24,2021 <br /> 3. Milling Process <br /> a. A detailed narrative of the milling process, including the use and application <br /> of designated chemicals in the milling process. The narrative should also <br /> include the nature of the chemicals used, their hazards, SDS sheets, and all <br /> storage locations within the Mill Facility, delivery of reagents into the milling <br /> process, piping systems etc. <br /> Response <br /> CJK Milling will comply with Federal Mine and Safety and Health Act of 1977 as amended by <br /> the Miner Act of 2006, MSHA -30 CFR Chapter 1 Parts 1-199 Chapter 1 Subchapter H <br /> Education and Training, Part 47 -Hazard Communication, Part 48 Training and Retraining, and <br /> Part 49 Subchapter K Metal and Non-metal Mining Safety and Health regulations and when <br /> applicable OSHA regulations specifically related to managing, and handling of designated <br /> hazardous materials5. <br /> CJK Milling will manage, handle, and dispose designated chemicals in accordance with Section <br /> 21.7 Facilities Evaluation (Sec. 6.4.21(7) and Appendix 21-2 Material Data Sheets criteria. <br /> Ore will be delivered and dumped into a bunker adjacent to the crushing building. From there, <br /> the ore will be fed into a hopper by a front-end loader. This hopper will feed the material into the <br /> crusher building, where the ore will be reduced in size for grinding. Dry lime will be added in the <br /> crusher building before exiting. The crushed material will be conveyed to a fine ore bin, which <br /> will feed the ball mill. The product of the ball mill will run through hydro cyclones for sizing, the <br /> oversize material being fed back into the ball mill, and the undersize material goes to a <br /> thickener for moisture content adjusting. A flocculent will be added here as needed. The <br /> material from the thickener will be pumped to the leach tanks, for liberation of the valued metals. <br /> A solution of cyanide will be added here. Upon exiting the leach circuit, the slurry containing <br /> tails and the pregnant solution will be pumped to a drum filter for dewatering. At this point, our <br /> stream splits: our pregnant solution containing the valued metals will go to the Merrill Crowe <br /> circuit, and the tailings will go to the cyanide detox circuit. The pregnant solution entering the <br /> Merrill Crowe circuit will be dearated, filtered (aided by the addition of diatomaceous earth <br /> (D.E.), and then the valued metals will be precipitated out with zinc and lead nitrate, and the <br /> remaining solution will be recycled. The cyanide detox circuit will repulp the tailings, and ferric <br /> sulfite will be added to the slurry to combine with the remaining cyanide to produce ferro <br /> cyanide. This resultant slurry will then be dewatered in a second drum filter, and transported to <br /> the TSF, and the filtered water will be recycled. <br /> The MSDS sheets, containing their nature, and hazards are contained in Table 21-3 on page <br /> 21-7 of Exhibit U. <br /> Reagents will be stored in the following areas: Lime will be stored in the crusher building, <br /> Flocculent will be mixed and administered from an area next to our fine ore bin, which is on the <br /> uppermost level, Zinc, lead nitrate, and D.E. will be stored and administered in the leachate <br /> room. Ferric sulfite for cyanide destruct will be stored and administered near the detox circuit, <br /> on the lower level. Cyanide will be stored on the lower level, and mixed/administered in a day <br /> tank outside next to the leach tanks on a sealed concrete pad with a curb. <br /> s The Bevill Amendment exempts from Subtitle C regulation "solid waste from the extraction,beneficiation,and <br /> processing of ores,and minerals." EPA has interpreted the terms"extraction,""beneficiation,"and"mineral <br /> processing"as describing the sequence of events needed to produce a saleable mineral. <br />
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