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2009-09-25_PERMIT FILE - M2009076 (22)
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2009-09-25_PERMIT FILE - M2009076 (22)
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Last modified
8/24/2016 3:55:47 PM
Creation date
4/7/2010 11:14:08 AM
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Template:
DRMS Permit Index
Permit No
M2009076
IBM Index Class Name
PERMIT FILE
Doc Date
9/25/2009
Doc Name
New 110d DMO Appl- Part I
From
Venture Resources, Inc.
To
DRMS
Media Type
D
Archive
No
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• It is practically impossible for heavy metals to be in solution under these operating conditions (pH range of 7.5-9) as <br />shown in the attached. A Water Handbook for Metal Mining _Operations, by Thomas R. Wildeman. <br />There are no known domestic wells or springs downgradient of the site (reference CO Div. of Water Resources map <br />attached). Groundwater flow beneath the site is controlled by mine openings as discussed above in 633(1)(i). <br />6.3.3(1)(k) <br />There will be NO designated chemicals used in this proposed operation. See a list of MSDS data at the end of this <br />exhibit for information on the chemicals to be used. <br />There will be, however, small scale handling of potentially acid forming material in the form of mine waste rock and <br />ore. There are carefully designed and managed measures in place to limit exposure and contamination. <br />To start, the Crushing Plant Feed pile is designed to contain any potential acidic runoff and/or seepage. A maximum <br />of 200 tons of material can be contained in this area for any period of time. The surface of this area is concrete <br />paved to prevent any acidic run-off and potential seepage. Additionally, the surface slopes '/." -1' towards the rear <br />where a 8" wide x 24" high concrete wall provides a berm to contain any run-off or sedimentation. A 10 year/ 24- <br />hour storm event (2.6" as reported by NOAA Atlas 2, Vol. III) on this pile is capable of being contained here. <br />The Crushing Plant operations are established to completely consume (on a daily basis) any material contained in <br />the Crusher Feed Bin to limit exposure. All of the crushed rock is stored in a Crushed Rock Bin. This bin can hold <br />80 tons of material. A removable roof covers the bin to keep the weather out and prevent any acidic runoff. <br />The gravity and flotation concentrate products that are collected and stored in Intermediate Bulk Shipping <br />Containers which are palletized polyethylene containers surrounded by a steel skeleton framework for protection <br />from impact and crushing. These containers measure approximately 42" cubic. At any time there may be upto 30 of <br />• these such containers stored on site, staged prior to transportation offsite. It shall be noted these containers meet <br />stringent DOT standards for transporting this specific material. <br />Within the proposed Tailings Impoundment there pre-exists approximately 8,000 tons of abandoned mine waste <br />rock. This operation will be removing this material and processing it to remove trace precious metal content as well <br />as heavy metal contamination. To mitigate any acidic runoff, best management practices within the proposed <br />Tailings Impoundment will be conducted as follows (see Exhibit E): <br />• Construct sedimentation basin. <br />• Construct earthen lined diversion ditches and connect natural diversion channels to sedimentation basin. <br />• Construct leachate collection barrier. <br />• Rip-rap and/or vegetate tailings dam face using appropriate controls, i.e. jute netting and/or hydro-mulch <br />using high-altitude roadside seed mix. <br />Once processed, the cleaned tailings will be re-impounded in the Tailings Impoundment in an inert state and <br />subjected to further reclamation as described in Exhibit D. Reference the attached waste stream characterization <br />demonstrating that the processed tailings are in a significantly better state than existing conditions. <br />As a part of normal mill operations, mill process water will be continuously monitored. A pH monitor and data <br />recorder will be installed at the tailings pump location within the mill. Should the pH reach a state outside of the <br />7.5-9 range that is necessary to precipitate the heavy metals, alarm notification will be activated for the operations <br />personnel. The submittal notes on this Serfilco Model 432 monitor/recorder can be found attached in this Exhibit C. <br />If the pH falls outside of the 7.5-9 range, the operators are instructed to shut down the operation that delivers waste <br />to the impoundment. Once the source of the problem is corrected upstream in the process, waste can then be <br />continued to be discharged to the impoundment. It is practically impossible for heavy metals to be in solution under <br />these operating conditions (pH range of 7.5-9) as shown in the attached A Water Handbook for Metal Minims <br />Operations, by Thomas R. Wildeman. <br />•
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