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Barnard - Crown Pillar

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Pillar

Text of Barnard - Crown Pillar

  • Report to:

    AL-MASANE AL-KOBRA MINING COMPANY

    PRELIMINARY GEOTECHNICAL REPORT ON THE AL-MASANE PROJECT

    Document No. 0886900100-REP-R0001-00

    Third Party Disclaimer

    The content of this document is not intended for the use of, nor is it intended to be relied upon by any person, firm or corporation, other than the client and Wardrop Engineering Inc. Wardrop Engineering Inc. denies any liability whatsoever to other parties for damages or injury suffered by such third party arising from use of this document by them, without the express prior written authority of Wardrop Engineering Inc. and our client. This document is subject to further restrictions imposed by the contract between the client and Wardrop Engineering Inc. and these parties' permission must be sought regarding this document in all other circumstances.

    Confidential

    This document is for the confidential use of the addressee only. Any retention, reproduction, distribution or disclosure to parties other than the addressee is prohibited without the express written authorization of Wardrop Engineering Inc.

  • 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

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