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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 20 <br /> CDRMS <br /> September 24,2021 <br /> b. Diagrams and drawings demonstrating the flow of material from source to <br /> sink including crusher circuit,flotation circuit, drying and packaging as well <br /> as tailings flow path. <br /> Response <br /> Details addressing the requested crusher, flotation, drying is presented in detail in Section 4.0 <br /> Rule 6.4.4. Exhibit D - Mining Plan <br /> See attached process flow sheet, and general arrangement plan. <br /> c. Tailings Chemistry <br /> Response <br /> The Leadville Mill is a toll mill accepting approved ores from different mining sources. Each <br /> source will be analyzed to determine process and environmental acceptability. (See Ore <br /> Acceptance Criteria Appendix 21-9 in permit) Tailing's chemistry for the accepted ores, except <br /> for gold content, is like the chemical properties logged in for processing. If deemed necessary <br /> and warranted, TSF tailings geochemical analysis will be undertaken. CJK will routinely <br /> analytically test water discharged to the TSF for pH, and cyanide. When pH is less than 8.0, <br /> lime will be added to the discharged water to maintain a pH above 8.0 and when total cyanide <br /> exceeds 1.0 ppm, the cyanide detoxification process will be modified to limit total cyanide <br /> concentration to levels to be statistically equal to or less than 1.0 ppm. <br /> d. Milling capacity, including maximum output and an average range of material <br /> processed. <br /> Response <br /> The mill is designed to handle approximately 400 tpd, using our currently identified input ore. <br /> If/when we accept ore from other sources, this output may change, due to ore characteristics <br /> such as grindability and crushing. We do not foresee producing more than 400 tpd with our <br /> current configuration. <br /> 4. As Built Certifications <br /> a. Engineering evaluations and stamped certified as-built documentation <br /> should be submitted for the Mill building foundation,secondary containment <br /> structures, and for the milling and tailings handling equipment. The <br /> certifications should also include the credentials of the individual or team <br /> certifying the review. <br /> Response <br /> This work is underway, and will be completed upon conditional permit approval by the Division. <br /> CJK commits to providing this documentation to the Division as a condition of final permit <br /> approval. <br /> Tailings Storage Facility (TSF) <br /> The application proposes doubling the operating capacity of the mill, from 200 tons <br /> per day to 400 tons per day and adding a cyanide circuit to the milling process. <br /> Under the current 110d permit, through AM-01 and TR-04, a TSF design was <br /> approved by the Division. The current application proposes operations that would <br /> result in significant changes in the tailings volume and tailings composition (i.e. <br /> doubling the production rate and addition of cyanide to the system). The Division <br /> considers the TSF to be an Environmental Protection Facility (EPF). As such, the <br />
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