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2016-02-03_PERMIT FILE - C1981038A
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2016-02-03_PERMIT FILE - C1981038A
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Last modified
10/3/2016 7:33:57 AM
Creation date
2/29/2016 8:59:55 AM
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Template:
DRMS Permit Index
Permit No
C1981038A
IBM Index Class Name
Permit File
Doc Date
2/3/2016
Doc Name
page 100 to 164
Section_Exhibit Name
Volume 1 2.05 Operation and Reclamation Plans Part 3
Media Type
D
Archive
Yes
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. ~ 2.05 APPLICATSCN FOR PERDffT Ft7R SURFACE OR UfID£RGNA(A~ID MINIIJG ACTIVITIES - <br />~~ MINIMUM REQUIRII+~I15 FOR OPERATION AIID RHCLAMATION PLANS. <br />2.05.6 Mitigation of Surface Opal Minirg Operation Facts. (Contd.) <br />(6) (b) (i) (B) Cont'd.) <br />Federal lease C-377210 stipulation "g" limits extraction beneath <br />Steven's Gulch and East Roatcap Creek to necessary development aooess <br />entryways below 600 feet of Overburden thiclmess. In ow~g~liance with <br />BIM stipulation "g", ~V will drive access entryways only beneath the <br />Stevens Gulch and East Roatcap Creek drainage buffer zones under 600 <br />feet of Overburden. Permanent protective pillars will be left standing <br />to prevent all surface and subjacent disturbance to the Overburden. <br />Protective pillars in these buffer zones will be designed to provide <br />safety factors in excess of 2.0 using the Wilson pillar design method <br />(refer to Pillar Stability Calculations in Volume 2). Panel designs <br />for specific development geometries and mining heights vary within <br />these buffer zones and are optimized to provide maximum econcanic <br />recovery of the coal resource, however, the minimum safety factor <br />criteria for all panels developed within these buffer zones remains <br />constant at 2.0. Secondary extraction or retreat mining is limited to <br />the recovery of floor coal within previously developed entries. All <br />development entries are roof bolted in accordance with the approved <br />roof control plan in effect. <br />In the 600 to 800 feet Overburden depth buffer zones defined in the <br />~; above mentioned drainages, permanent protective pillars are designed <br />to provide safety factors in excess of 1.5 using the Wilson pillar <br />design method. Panel designs for specific development geanetries and <br />mining heights vary within these buffer zones and are optimized to <br />provide maximum economic recovery of the coal resource, however, the <br />minimum safety factor criteria for all panels developed within this <br />buffer zone remains constant (refer to Pillar Stability Calculations <br />in Volume 2) . Secondary extraction or retreat mining is limited to the <br />recovery of floor coal within previously developed entries. All <br />development entries are roof-bolted in accordance with the approved <br />roof control plan in effect. `This zone of development mining between <br />600 and 800 feet of Overburden also serves to dissipate abutment <br />stresses from full extraction to the virtually solid buffer area <br />barrier blocks stipulated by the BIM. In essence, these subsidence <br />~~ <br />TR 92-19 Revised 6/08/92 <br />142 <br />
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