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2021-12-07_REVISION - M2012032 (24)
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2021-12-07_REVISION - M2012032 (24)
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Last modified
12/7/2021 11:13:38 AM
Creation date
12/7/2021 10:59:04 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2012032
IBM Index Class Name
Revision
Doc Date
12/7/2021
Doc Name Note
Exhibit U: Designated Mining Operation Environmental Protection Plan
Doc Name
Proposed Revision Materials
From
Ouray Silver Mines, Inc
To
DRMS
Type & Sequence
AM2
Email Name
LJW
THM
Media Type
D
Archive
No
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9 Surface Water Control & Containment Facilities <br /> Surface water flows shown on Map G-1 and C-la at the Revenue Mine are dominated by Sneffels <br /> Creek and the associated drainage basin (i.e., Yankee Boy Basin and Governor Basin). Yankee Boy <br /> Basin is approximately 2000 acres with a high point of 14,150 feet(peak of Mt. Sneffels) and <br /> comprises the upper reaches of Sneffels Creek. Governor Creek drains the 870-acre Governor Basin <br /> with a high point of 13,581 feet at Mount Emma,joining Sneffels Creek in the valley floor above <br /> the Revenue Portal area. The proposed change in this amendment expands the footprint of the hoist <br /> and refuge chamber in Governor Basin from 100 square feet(.23 acres)to approximately 1.39 acres <br /> to allow for safer winter operations, secondary escapeway, and stormwater management. There is <br /> no established stream in the vicinity of the proposed Governor Basin affected lands boundary. <br /> Sneffels Creek just upstream of the Revenue Mine ranges in flow from a peak recorded flow of <br /> 19,000 gallons per minute (GPM)in summer months to less than 400 GPM in the winter season. <br /> These flows are supplied by surface runoff, fracture flow, and historic open mine workings such as <br /> the Atlas Mine, Ruby Trust and Lower Mountain Top. Water quality in Sneffels Creek upstream of <br /> the Revenue Mine does not meet use classifications or water quality standards for cadmium, lead <br /> and zinc. <br /> The surface water flows at the Revenue Mine report to Sneffels Creek, which is Stream Segment 9 <br /> of the Uncompahgre River basin (COGUUN09) as designated by Regulation 35 of the Colorado <br /> Water Quality Control Commission (5 CCR-1002-35). Sneffels Creek near the mine alternates <br /> between shallow wide sections and very narrow, steep, high-energy, canyons. The stream drops <br /> from 10,670 feet elevation at the upper edge of the permit to 10,580 feet at the bottom of the permit <br /> area, over a distance of 2,400 feet with a grade of approximately 3.75%. The grade steepens just <br /> northeast of the permit area as the creek flows towards Canyon Creek and the Camp Bird Mine. <br /> From there, the combined flow meets the Uncompahgre River at Ouray, approximately 5 miles <br /> downstream from the mine. <br /> 9.1 Design Specifications <br /> Each of the environmental control features at the Revenue Mine are designed to contain designated <br /> chemicals at the mill and to divert and convey surface runoff away from features that could cause <br /> acid mine drainage. <br /> 9.2 Stormwater Management Plan <br /> Stormwater at the Revenue Portal area and the three ventilation shafts is managed under a <br /> Stormwater Permit Certification COR-040289 and the Stormwater Management Plan (SWMP), <br /> which details the mining activities, effluent limitation guidelines, stormwater management controls, <br /> identification of potential pollutant sources, best management practices, schedules and procedures, <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-23 <br />
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