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2019-05-17_REVISION - M1994117
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2019-05-17_REVISION - M1994117
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Last modified
1/5/2025 5:46:07 AM
Creation date
5/20/2019 1:02:07 PM
Metadata
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Template:
DRMS Permit Index
Permit No
M1994117
IBM Index Class Name
REVISION
Doc Date
5/17/2019
Doc Name
Adequacy Review #3
From
Colorado Milling Company
To
DRMS
Type & Sequence
AM1
Email Name
AME
Media Type
D
Archive
No
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10) The operator's response to item no. 14 states the Wynona Mine water will be sampled on a <br /> quarterly basis(and analyzed for a total of 12 water quality parameters),when the operation begins <br /> storing water in the mine and when the mill is in operation. Firstly, please add the following <br /> parameters approved in Technical Revision No. 9 to the Winona Mine sampling parameter list: <br /> Manganese, Temperature, and Conductivity. Secondly, please commit to collecting a grab sample <br /> of the current mine-pool and providing the results to the Division a minimum of 60 days prior to <br /> pumping out the water for mill use or pumping any additional water behind the Times Mine <br /> bulkhead. Lastly, please commit to reporting the Wynona Mine water quality sampling results to <br /> the Division on a quarterly basis along with the other required water monitoring data for the site <br /> once operations have commenced. <br /> CMC Response: The water stored in the Wynona Mine workings was sampled and analyzed on a <br /> quarterly basis when the Gold Hill Mill was in operation during several different periods under <br /> four different permitted operators. However, the water in the Wynona Mine cannot be accessed <br /> for sampling and analysis at the present time, because the drill hole casing has shifted during the <br /> last two years. CMC will substitute the water stored in the Times Mine, which can be accessed <br /> from the drill hole situated above the winze or from the water behind the Times Mine Bulkhead. <br /> CMC will sample this water on a quarterly basis for the same parameters in mg/l (T) as was <br /> previously done when the mill was being operated, with the following elements: Arsenic, <br /> Cadmium, Copper, Iron, Lead, Mercury, Silver, Zinc and Manganese, along with pH, Solids <br /> (dissolved), Sulfate as SO4, mg/l, Temperature and Conductivity. These will be added to the <br /> approved Technical Revision No. 9 sampling parameter list for the Times Mine until such time <br /> that the Wynona Mine water can be accessed for quarterly sampling.In addition,CMC will commit <br /> to collecting a grab sample of the current mine-pool water and providing the results to the DRMS <br /> a minimum of 60 days prior to pumping out the water for milling or pumping any water behind <br /> the Times Mine Bulkhead. <br /> 11) The operator's response to item no. 15 states the discrepancy between the estimated annual <br /> water usage for the mill and the amount of water the operator is authorized (per Decree) to <br /> withdraw from Left Hand Creek during irrigation season was a mathematical error. However, no <br /> 10 <br />
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