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Kalsaka Feasibility Study - 2006 Update

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Estudio de factibilidad
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    KALSAKA GOLD PROJECT Independent Update of the 2003 Feasibility Study Prepared by RSG Global Consulting Pty Ltd on behalf of: Cluff Gold PLC     P:\Projects\Cluff Gold\PKAL02_Kalsaka Gold_Rev. Feasibility Study\Report\pr_PKAL02_IndependentUpdate_Sept2006_Final.doc KALSAKA PROJECT Independent Update of the 2003 Feasibility Study Prepared by RSG Global Consulting Pty Ltd on behalf of: Cluff Gold PLC Author(s):   Mick McMullen Manager Audits BSc MAusIMM Richard Hyde Senior Consultant Audits BSc MAusIMM Julian Verbeek Principal Consultant - Resources B Sc. (Hons), PhD. (Geol.), MAusIMM Barry Cloutt Metallurgy Manager BSc MSAGA Peter Rooke Associate - Capital Costs B Eng MAusIMM Harry Warries Principal Consultant - Mining Engineering BAppSc MAusIMM Date: September 2006 Job Number: PKAL02 Copies: Cluff Gold PLC (2) RSG Global – Perth (1) Primary Author Richard Hyde Supervising PrincipalLinton Kirk  This document has been prepared for the exclusive use of Cluff Gold PLC (“Client”) on the basis of instructions, information and data supplied by them. No warranty or guarantee, whether express or implied, is made by RSG Global with respect to the completeness or accuracy of any aspect of this document and no party, other than the Client, is authorised to or should place any reliance whatsoever on the whole or any part or parts of the document. RSG Global does not undertake or accept any responsibility or liability in any way whatsoever to any person or entity in respect of the whole or any part or parts of this document, or any errors in or omissions from it, whether arising from negligence or any other basis in law whatsoever.      Kalsaka Project Update of 2003 Feasibility Study – September 2006 Table of Contents EXECUTIVE SUMMARY...............................................................................................................................i   1   Introduction.......................................................................................................................................1   1.1   Scope of Work.................................................................................................................................1   1.2   Participants......................................................................................................................................1   1.3   Data Acquired..................................................................................................................................2   1.4    Abbreviations...................................................................................................................................2   1.5   Project Location and Access............................................................................................................3   1.6   Physiography and Climate...............................................................................................................3   1.7   Project History and Current Status..................................................................................................4   2   Geology..............................................................................................................................................5   2.1   Regional Setting...............................................................................................................................5   2.2   Project Geology...............................................................................................................................5   2.2.1   Geology....................................................................................................................................5   2.2.2   Structure...................................................................................................................................5   2.2.3   Mineralisation and Alteration....................................................................................................5   2.2.4   Weathering...............................................................................................................................6   3   Mineral Resource Estimation..........................................................................................................7   3.1   Previous Resource Estimates..........................................................................................................7   3.2   Quantity and Quality of Data............................................................................................................7   3.2.1   Introduction...............................................................................................................................7   3.2.2   Drill Sampling Method...............................................................................................................8   3.2.3    Analytical Method.....................................................................................................................9   3.2.4   Density Determination..............................................................................................................9   3.3   Geological Modelling......................................................................................................................10   3.3.1   Weathering and Oxidation Interpretation.................................................................................10   3.3.2   Mineralisation Models..............................................................................................................11   3.4   Statistical........................................................................................................................................13   3.4.1   Compositing.............................................................................................................................13   3.4.3   Descriptive Statistics................................................................................................................13   3.4.4   Indicator Statistics...................................................................................................................14   3.5   Variography...................................................................................................................................14   3.5.1   Kalsaka Deposit Variography...................................................................................................15   3.5.2   Summary.................................................................................................................................15   3.6   Grade and Tonnage Estimation.....................................................................................................15   3.6.1   Block Model Development.......................................................................................................15   3.6.2   Grade Estimation.....................................................................................................................16   3.7   Reporting and Classification..........................................................................................................16   3.7.1   Introduction..............................................................................................................................16   3.7.2   Criteria for Resource Categorisation........................................................................................16   3.7.3   Categorised Resources...........................................................................................................18   4   Mine Design and Ore Reserve Assessment.................................................................................19   4.1   Resources......................................................................................................................................19   4.2   Mining Approach............................................................................................................................19   4.3   Geotechnical Mine Design Criteria................................................................................................19   4.4   Pit Optimisation..............................................................................................................................20   4.4.1   Introduction..............................................................................................................................20   4.4.2   Whittle Pit Optimisation Model Construction............................................................................20   4.4.3   Dilution and Mining Recovery Factors.....................................................................................21      Kalsaka Project Update of 2003 Feasibility Study – September 2006 4.4.4   Whittle Four-X Input Parameters.............................................................................................21   4.4.5   Commodity Price.....................................................................................................................21   4.4.6   Mining Costs............................................................................................................................21   4.4.7   Processing Costs.....................................................................................................................21   4.4.8   Processing Recoveries............................................................................................................22   4.4.9   General and Administration Costs...........................................................................................22   4.4.10   Royalty.....................................................................................................................................22   4.4.11   Slope Parameters....................................................................................................................22   4.4.12   Whittle Four-X Input Parameters Summary.............................................................................22   4.4.13   Cutoff Calculation....................................................................................................................23   4.4.14   Pit Optimisation Setup.............................................................................................................23   4.4.15   Pit Optimisation Results...........................................................................................................24   4.4.16   Sensitivity Analysis..................................................................................................................24   4.5   Contract Mining..............................................................................................................................24   4.5.1   Introduction..............................................................................................................................24   4.5.2   Contractor Mining Costs..........................................................................................................24   4.6   Mine Design...................................................................................................................................25   4.6.1   Slope Design Parameters........................................................................................................25   4.6.2   Ramp and Road Parameters...................................................................................................25   4.6.3   Minimum Mining Width............................................................................................................26   4.6.4   Pit Staging...............................................................................................................................26   4.6.5   Pit Designs..............................................................................................................................26   4.6.6   Final Design versus Pit Optimisation.......................................................................................27   4.6.7   Ore Reserves..........................................................................................................................27   4.7   Waste Dumps................................................................................................................................29   4.8   ROM Ore Stockpile........................................................................................................................29   4.9   Grade Control and Blending..........................................................................................................29   4.10   Mine Production Scheduling..........................................................................................................29   4.10.1   Introduction..............................................................................................................................29   4.10.2   Scheduling Approach and Assumptions..................................................................................30   4.10.3   Scheduling Results..................................................................................................................30   5   Process Testwork...........................................................................................................................32   5.1   Introduction....................................................................................................................................32   5.2   Bottle Roll Testwork.......................................................................................................................32   5.3   Flowsheet Recovery Testwork.......................................................................................................33   5.4   Summary.......................................................................................................................................33   6   Plant Design....................................................................................................................................35   6.1   Introduction....................................................................................................................................35   6.2   Crushing Circuit.............................................................................................................................35   6.3   Reagent Handling and Addition.....................................................................................................35   7   Power Supply..................................................................................................................................36   8   Water Supply...................................................................................................................................37   8.1   2003 SRK Report...........................................................................................................................37   8.2   Possible Paleochannel Water Source............................................................................................37   9   Labour..............................................................................................................................................39   9.1   2003 SRK Report...........................................................................................................................39   9.2   RSG Global Comments.................................................................................................................39   10   Infrastructure..................................................................................................................................40   11   Environment....................................................................................................................................43   11.1   2003 SRK Report...........................................................................................................................43  
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