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REV95813
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REV95813
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Entry Properties
Last modified
8/25/2016 3:20:43 AM
Creation date
11/21/2007 11:52:34 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Revision
Doc Name
MINING AND RECLAMATION PLAN MT GUNNISON 1 MINE
Type & Sequence
TR56
Media Type
D
Archive
No
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MIPIIPIG APID RECLAMATION PLAN January 1986 <br />MT . GUPIPI I SON PIO . 1 f4I PIE <br />3.3.1.5 ~+drologic Protection Upon Closure or Abandonment <br />Once mining activities have ceased, all disturbed areas which have <br />not been regraded, scarified, topsoiled, and revegetated will be <br />reclaimed using methods described in detail in Section 4 of this <br />Mining and Reclamation Plan. <br />Drill Hole Sealing Procedures <br />No Return Flow - Holes at Mt. Gunnison that are drilled with air <br />or experience no return flows will be sealed in the following <br />manner. A cement plug is placed in the bottom of the hole through <br />the F seam and a safe distance into the overlying material. This <br />is possible since most of the water loss occurs in the Barren <br />Member. A cement s~irface plug is then be placed in the top six to <br />ten feet of the hole. <br />Return Flow - Uncased drill holes that are drilled with water or <br />mud and for which it is possible to get retur:t flows at the surface <br />are sealed in-the following manner. The viscosity of the drilling <br />fluid or mud is increased by 20 seconds per quart above the normal <br />..drilling fluid.in.the hole .at .the time of abandonment.' The hole <br />is cemented from the bottom through..the F coal seam a safe distance <br />into the overlying material. This creates a.cement seal at the <br />bottom of .the hole through .the F coal .seam and..any.other lower coal ._ <br />seams and a mud seal on top of the cement. A six to ten foot <br />surface plug of cement is then be placed at the surface. <br />Cased Holes - Due to large .water losses that occur in the Barren <br />Member, very often casing has to be set from the surface to the <br />top of the F seam in order to core through the F seam or any lower <br />seams. Often it is impossible to recover this casing when drilling <br />activities are finished. When this situation occurs, the casing <br />is left in the hole and the hole is sealed in the following <br />manner: a cement plug is placed from the bottom of the hole up <br /> <br /> <br />into the .bottom of the casing. Then a cement surface plug is .. _ <br />placed in the top six to aen feet of the cased hole. _ <br />3-54 <br /> <br />
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