PERMFILE52001

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 6/2/2006
• Section_Exhibit Name: Exhibit 60B Subsidence Evaluation for the South of Divide Mining Area
• Media Type: D
• Archive: No

TABLE OF CONTENTS
DEFIhT170N OF SYMBOLS _rv
DEFINITION OF TERMS _____......v

1.0 INTRODUCTION. ._._..~..__ 1
2.0 DHNING METHOD
3.0 GEOLOGIC FACTORS INFLUENCING SUBSIDENCE
4.0 FIELD RECOGNITION OF SUBSIDENCE AND NOI~i'-SOBSIDEIKCE FEATURES IN THE REST
ELK DIINING suF s ._..2
4.1 SuesroENCE CxACRS nNO COMPRESSION FFwTVRFS ............................................................................................3
42 Coxsrnucnox CRACRS..----- ..................°-----°-...........°°---------.-.....-°°-----.............•-°------.............---------------........3
43 DES1ccA~noN CRactcs....'--'--' ..................."'------'--..........'--'------...........---------............'---------.-.........------------...........4
4.4 PSEUDO SUBSmFXCE FEANRFS (GRnvrrv-INDUCm Ttlvstox CRACY.S) ..............................................................4
5.0 SUBSIDENCE PREDICTION BASED ON LONGWALL hIINDV'G AT REST ELK MINEr.~..5
5.1 CAVED ZONE ......................................................................................................................................................5
52 FRACTUREDZOxE...--'------' .................-'-----------..........'---------.........."--"-----' .........""---'---.............-------'--------.......5
53 CONII[VUOUSDEFDRMA17QN2:oxEANDNEARSURFAeEZAxE ................ ......................................................_.7
53.! Vertices! med Horizorad Disp(acemera, IPIt, amt Horizorad Strdn .. ............................°°---------..............J
5-3-2 .MadmumProjectedDepthr ofSetrface Cracks ................................. ......................................................10
5.4 AxcaeOFDRww ..............................................................................................................................................12
55 BREAK ANGLE .......................................•-----...........-----------...........-•-•------.... ......---------.......................................12
5.6 AxGLEOFMAioRhvF[.uDSCE .................................................................... ......................................................13
SJ RQ.nnoNBEIVUEQaDVNawcA[~onFlzrwcSVasmFxceDEFOa*unoxs ..................................................°---13
5.8 Camev.ExrnACaoNWIDlxoFM>PrnvGPAKrys ................................... ................................•--...............----14
5.9 RFSUL1soFCo~[nfacMOVII.uaG........-------------------------------------------------------------------------------------------------------14
6.0 RATE AND DURATION OF SUBSIDENCE_.._. .._..IS
7.0 EFFECTS OF TOPOGRAPHY AND STRUCTURE ON SUBSIDENCE PROCESSES _._._....._.,15
71 EFFF-crs of ToraaurHV ox SvasmrivvcE CRACxs ........................................................................................16
72 EFFECTS OF RUGGED TOPOGRAPHY ONSfIBSIDExCEAND MINE S'1RFSSts ......................................................16