Report to:
AL-MASANE AL-KOBRA MINING COMPANY
PRELIMINARY GEOTECHNICAL REPORT ON THE AL-MASANE PROJECT
Document No. 0886900100-REP-R0001-00
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Report to:
AL-MASANE AL-KOBRA MINING COMPANY
PRELIMINARY GEOTECHNICAL REPORT ON THE AL-MASANE PROJECT
JUNE 2008
Prepared by Date June 12, 2008 Barnard Foo., M.A.Sc., P.Eng.
Reviewed by Date June 12, 2008 Noris Del Bel Belluz, P.Geol.
Authorized by Date June 12, 2008
Noris Del Bel Belluz, P.Geol.
Suite 800, 555 West Hastings Street, Vancouver, British Columbia V6B 1M1 Phone: 604-408-3788 Fax: 604-408-3722 E-mail: [email protected]
Al-Masane Al-Kobra Mining Company
R E V I S I O N H I S T O R Y
REV. NO
ISSUE DATE PREPARED BY AND DATE
REVIEWED BY AND DATE
APPROVED BY AND DATE
DESCRIPTION OF REVISION
00 Barnard Foo Noris Del Bel Belluz
Noris Del Bel Belluz
Draft to Client
Al-Masane Al-Kobra Mining Company
T A B L E O F C O N T E N T S
1.0 INTRODUCTION ..............................................................................................................1-1
2.0 GEOTECHNICAL DATA COLLECTION..........................................................................2-1 2.1 GEOTECHNICAL CORE LOGGING.........................................................................................2-1 2.2 UNDERGROUND GEOTECHNICAL MAPPING..........................................................................2-3
3.0 ROCKMASS CLASSIFICATION SYSTEM ......................................................................3-1
4.0 INTERPRETED GEOTECHNICAL CONDITIONS ...........................................................4-1 4.1 SUMMARY OF GEOTECHNICAL OBSERVATIONS....................................................................4-1
4.1.1 BOREHOLE WS 19............................................................................................4-1 4.1.2 BOREHOLE WS 20............................................................................................4-2 4.1.3 BOREHOLE AM 06 ............................................................................................4-3 4.1.4 BOREHOLE AM 22 ............................................................................................4-3 4.1.5 BOREHOLE AM 80 ............................................................................................4-4 4.1.6 BOREHOLE AM 129 ..........................................................................................4-5
4.2 PRELIMINARY GEOTECHNICAL DATA COLLECTION RESULTS.................................................4-5 4.2.1 ROCKMASS CLASSIFICATION CONCLUSIONS (UNDERGROUND MAPPING).............4-5 4.2.2 ROCKMASS CLASSIFICATION CONCLUSIONS (BOREHOLES).................................4-6
5.0 STOPE DIMENSIONING..................................................................................................5-1 5.1 THE MODIFIED STABILITY NUMBER, N.................................................................................5-1 5.2 STABILITY GRAPH ANALYSES..............................................................................................5-2
6.0 CROWN PILLAR ASSESSMENT ....................................................................................6-1 6.1 EMPIRICAL METHODS.........................................................................................................6-1
6.1.1 CARTERS CROWN PILLAR STABILITY ANALYSIS .................................................6-1 6.1.2 CROWN PILLAR STABILITY ANALYSIS PARAMETERS (FOURTH HEADING) .........6-3 6.1.3 RESULTS: CARTERS CROWN PILLAR STABILITY ANALYSIS .................................6-4
6.2 HOEK AND BROWN EMPIRICAL PILLAR DESIGN ....................................................................6-4 6.2.1 RESULTS: HOEK AND BROWN CROWN PILLAR DIMENSION ANALYSIS ..................6-5
6.3 NUMERICAL ANALYSIS........................................................................................................6-6 6.3.1 CPILLAR ANALYSIS METHOD .............................................................................6-6
7.0 BACKFILL REQUIREMENTS..........................................................................................7-1
8.0 OBSERVATION UNDERGROUND..................................................................................8-1 8.1 INTERSECTION REQUIRES CABLE BOLTING..........................................................................8-1 8.2 PORTAL.............................................................................................................................8-1 8.3 PILLAR REQUIRES ENFORCEMENT ......................................................................................8-3
Al-Masane Al-Kobra Mining Company
ii
8.4 GROUND WATER................................................................................................................8-3 9.0 CONCLUSIONS AND RECOMMENDATIONS ................................................................9-1
9.1 ROCKMASS INTERPRETATION .............................................................................................9-1 9.2 STOPE STABILITY ANALYSIS ...............................................................................................9-1 9.3 CROWN PILLAR ANALYSIS ..................................................................................................9-2 9.4 GROUND CONTROL ............................................................................................................9-2 9.5 GROUND WATER................................................................................................................9-2 9.6 CLOSURE ..........................................................................................................................9-2
Al-Masane Al-Kobra Mining Company
L I S T O F T A B L E S
Table 2.1 Borehole Details............................................................................................... 2-1 Table 2.2 Point Load Testing Samples ............................................................................ 2-2 Table 3.1 Rockmass Quality Categories based on Q ...................................................... 3-1 Table 4.1 Simplified Rockmass Quality Categories Based on Q ..................................... 4-1 Table 4.2 Hole ID 19 (Saadah) ........................................................................................ 4-2 Table 4.3 Hole ID 20 (Sadaah) ........................................................................................ 4-2 Table 4.4 Hole AM 06 (Sadaah)....................................................................................... 4-3 Table 4.5 Hole AM 22 (Sadaah)....................................................................................... 4-3 Table 4.6 Hole AM 80 (Houra) ......................................................................................... 4-4 Table 4.7 Hole AM 129 (North Houra) ............................................................................. 4-5 Table 5.1 Stope Dimension and Stability Numbers (N) ................................................... 5-2 Table 6.1 Average Stope Dimensions.............................................................................. 6-1 Table 6.2 Crown Pillar Stability Design Parameters and Result ...................................... 6-2 Table 6.3 Scaled Crown Pillar Span with Variable Span and Thickness.......................... 6-3 Table 6.4 Hoek and Brown Empirical Pillar Dimension Estimate Values ......................... 6-6 Table 6.5 Al Masane CPillar Analysis Results ................................................................. 6-7
L I S T O F F I G U R E S
Figure 5-1 Al Masane Stability Graph Analysis ................................................................. 5-4 Figure 6-1 Crown Pillar Analysis ....................................................................................... 6-3 Figure 6-2 Hoek and Brown Pillar Dimension to Strength Estimate .................................. 6-6 Figure 6-3 Stability Analysis of Crown Pillar...................................................................... 6-8 Figure 8-1 Wedge Failure Close to Pump Station ............................................................. 8-1 Figure 8-2 Mine Portal....................................................................................................... 8-2 Figure 8-3 Pillar (Between Ramp and North-South Exploration Drift)................................ 8-3 Figure 8-4 Ground Water Filtration.................................................................................... 8-4
Al-Masane Al-Kobra Mining Company
Al-Masane Al- Kobra Mining Co. 1-1 0886900100-REP-R0001-00 P
