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2012-12-20_GENERAL DOCUMENTS - C1981038
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2012-12-20_GENERAL DOCUMENTS - C1981038
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Last modified
8/24/2016 5:11:33 PM
Creation date
12/21/2012 9:04:35 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981038
IBM Index Class Name
General Documents
Doc Date
12/20/2012
Doc Name
Proposed Decision & Findings of Compliance (RN6)
From
DRMS
To
Bowie Resources, LLC
Permit Index Doc Type
Findings
Email Name
SLB
SB1
Media Type
D
Archive
No
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Fish and wildlife habitat is a planned postmining land use. The applicant has selected <br />appropriate plant species and distributions to benefit fish and wildlife (4.18(4)(i)). <br />XIV. Protection of Underground Mining - Rule 4.19 <br />This Section is not applicable to the Bowie No. 1 Mine permit. <br />XV. Subsidence Control - Rule 4.20 <br />Subsidence is discussed in Section 2.05 of Volume 1. Subsidence appendices are found in <br />Volume 3. Baseline documentation of surface water features potentially impacted by subsidence <br />is located in Volume 4. Annual hydrologic reports and subsidence reports have been produced <br />annually since 1982 and exist as standalone volumes. <br />The Bowie No. 1 Mine was located in the D seam and utilized conventional room and pillar <br />methodology. The applicant had completed the required inventory of structures and renewable <br />resource lands, a projection of probable subsidence, and developed a subsidence control plan and <br />an appropriate accompanying subsidence monitoring plan. <br />Inventory <br />The operator identified 41 structures within the permit and adjacent areas, depicted on Map 9 -7. <br />Twenty six (26) of these structures were inventoried within the permit area, as well as two water <br />pipelines and an all- weather gravel road within Steven's Gulch. No inventoried structures will be <br />affected by mining operations during this permit term since mining has ceased. <br />The operator had also identified several alluvial /colluvial surficial deposits which constitute <br />renewable resource lands within the revised permit area. Surficial deposits have been identified <br />within Steven's Gulch, East Roatcap Creek, and in the area of the Morrell Cow Camp. The <br />applicant completed a subsidence survey of hydrologic features which is described in Section <br />2.05.6(b) of the permit application. Additional shallow alluvial monitoring wells were installed <br />within the alluvial /colluvial deposits for the purposes of monitoring potential effects of <br />subsidence upon the hydrology of the surficial deposits. <br />Subsidence Proiections <br />The operator retained Geo -Hydro Consultants, Inc. to complete a technical projection of <br />subsidence expected within the revised permit area. A typical subsidence profile is graphically <br />depicted on Plate 11 of the subsidence study in Volume 3. Vertical subsidence was projected to <br />reach a maximum of approximately six feet. In consultation with the Division, and through the <br />employment of Dunrud's (1976) research, the operator estimates the conservative angle of draw <br />to be 20.5 degrees from vertical. The technical projections included in the subsidence study <br />conformed to the prudent state -of -the -art of subsidence projection. <br />Subsidence monitoring has been conducted within the Bowie No. 1 Mine permit area, in <br />compliance with the originally approved permit. The data collected to date corresponds with the <br />technical projections for vertical subsidence and draw angle (See Table 8, Volume 3 and annual <br />subsidence reports). <br />Page 34 of 42 <br />
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