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2011-11-14_REPORT - C1981012
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2011-11-14_REPORT - C1981012
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Last modified
8/24/2016 4:44:58 PM
Creation date
11/14/2011 10:18:48 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981012
IBM Index Class Name
Report
Doc Date
11/14/2011
Doc Name
2010 Annual Hydrology Report
From
J.E. Stover & Associates, Inc
To
DRMS
Annual Report Year
2010
Permit Index Doc Type
Hydrology Report
Email Name
JHB
Media Type
D
Archive
No
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November 2011 Page 1 -1 <br />1.0 INTRODUCTION <br />New Elk Coal Company (NECC) owns and operates the New Elk underground coal mine <br />and preparation plant in southern Colorado. This report presents the hydrologic monitoring <br />activities conducted at the mine during 2010 and analysis of trends over a twenty -seven year <br />monitoring period (1984 to 2010). The remainder of this section describes the mine site area and <br />the current hydrologic monitoring program. Section 2.0 describes the monitoring methods used <br />for this program while Section 3.0 provides the monitoring data for the year. Section 4.0 <br />discusses mitigative measures taken to minimize disturbance to area hydrologic functions and <br />Section 5.0 describes plans for future hydrologic monitoring activities. Data and information <br />related to this assessment are presented as appendices to this report. <br />Previous production from the New Elk Mine occurred intermittently from the Allen coal <br />seam between 1952 and 1988. The mine was temporarily sealed in 1988 and allowed to flood. <br />Monitoring data including the depth to water and water quality were collected for the mine pool <br />between February 2001 and November 2008. These data are presented previous annual <br />hydrologic reports. Active dewatering of the mine resumed from the East Portal Air Shaft in <br />December 2008 to facilitate entry and rehabilitation of the mine <br />1.1 Site Description <br />The New Elk East Portal area is located three miles east of Stonewall and seven miles <br />west of Weston in T33S, R68W in Las Animas County, Colorado. The mine is situated in <br />mountainous terrain with numerous canyons contributing runoff to the drainages of ephemeral, <br />intermittent, and perennial streams of the area (see Map 8, Regional Hydrology, in the permit <br />document). The New Elk Mine is located on the Middle Fork of the Purgatoire River, about <br />1.5 miles upstream of the confluence of the North Fork. Most surface facilities of the mine are <br />adjacent, and underground mining occurred under and to the north and south of the Purgatoire <br />River, in an area known as the Picketwire Valley. The mine was temporarily closed and sealed <br />in 1989. Dewatering ceased and the lower areas of the mine were gradually flooded. <br />NECC plans to resume mining in the Allen, Apache and Blue Seams. Phase I of <br />resuming operations required remotely pumping mine water from the East Portal airshaft and <br />other boreholes using surface - powered pumps. Approvals for this process were granted in 2008 <br />and dewatering started in December of 2008. Phase II reestablishes mine ventilation by <br />breaching temporary seals at the East and West Portals and Apache Canyon, and reinstallation of <br />fans at the East Portal and West Portal airshafts. Phase III is the development of entries to <br />establish ventilation at the Apache Seam level. Phase IV is the active mining of coal. <br />The Purgatoire River is the primary stream drainage in the area of the mine The <br />headwaters of the Purgatoire are located on the eastern slope of the Sangre de Cristo Mountain <br />Range west of the mine area. The general direction of stream flow is easterly to the confluence <br />with the Arkansas River, also in Las Animas County. The principal tributary of the Purgatoire <br />River which drains in the vicinity of the mine permit area is Apache Canyon. Apache Canyon <br />drains a watershed of approximately 7,264 areas. Cover in the canyon is primarily woodland <br />with an herbaceous valley bottom. Primary land use is grazing and wildlife habitat. Surface <br />mine features within the Apache Canyon (on the left fork) include two ventilation shafts. <br />
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