excalibur mining corp ltd - juno annual technical report 2011...interpolation of block grade into a...

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011 Title Page for Reporting under the NT Mining Act Titleholder Tennant Gold Operator Excalibur Mining Corporation Tenement Manager M & M Walter Consulting Titles/Tenements MLC45, 46, 47, 68, 154, 155, 284, 578, 579 Mine/Project Name Juno Report title including type of report and reporting period including a date Annual Technical Report Juno Period 1/1/2010 – 31/12/2010 Personal author Peter Thomas Corporate author Excalibur Mining Corporation Company reference number Juno 2010 Target Commodity or Commodities Gold Copper Bismuth Date of report March 2011 Datum/Zone GDA94 Zone 53K 250 000 K mapsheet Tennant Creek SE5314 100 000 K mapsheet Tennant Creek 5758 Contact details Postal address Excalibur Mining Corporation PO Box 1779 West Perth Western Australia 6872 Fax 08 9322 3005 Phone 08 9322 8000 Email for further technical details [email protected] Email for expenditure [email protected] 1

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Page 1: Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011...Interpolation of block grade into a Surpac Block Model used Ordinary Kriging. Variography analysis and Qualitative Kriging

Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

Title Page for Reporting under the NT Mining Act  

Titleholder  Tennant Gold   

Operator  Excalibur Mining Corporation 

Tenement Manager  M & M Walter Consulting 

Titles/Tenements  MLC45, 46, 47, 68, 154, 155, 284, 578, 579 

Mine/Project Name  Juno 

Report title including type of report and reporting period including a date 

 

Annual Technical Report Juno  

Period   1/1/2010 – 31/12/2010 

Personal author  Peter Thomas 

Corporate author  Excalibur Mining Corporation 

Company reference number  Juno 2010 

Target Commodity or Commodities  Gold Copper Bismuth 

Date of report  March 2011 

Datum/Zone  GDA94  Zone 53K 

250 000 K mapsheet  Tennant Creek SE53‐14 

100 000 K mapsheet  Tennant Creek 5758 

Contact details Postal address 

 

 

Excalibur Mining Corporation 

PO Box 1779 West Perth 

Western Australia 6872 

Fax  08 9322 3005 

Phone  08 9322 8000 

Email for further technical details  [email protected] 

Email for expenditure  [email protected] 

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

        

    

  

    

Annual Technical Report  

Juno Project   

MLC45, 46, 47, 68, 154, 155, 284, 578, 579  

Period 1/01/10 – 31/12/2010                 Author: P Thomas March 2011    

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

Executive Summary  During  the  reporting  period  Cube  Consulting  continued  their  commissioned  re‐evaluation  of Juno resources. Cube designed RC and Diamond drilling at Juno as a part of their commission.   Drilling included 55 RC holes for 10944m and 16 diamond tails for 1282m. Also completed was a DGPS survey of hole locations and downhole gyro survey.  Cube Consulting completed the review and reported mid year. The report resulted in a massive downgrade in the Juno resource.   

 Photo 1: Resource Drilling at Juno   

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

  

Contents  Summary                  1.  Introduction               2.  Location 3.  Tenement Status 4.  Geology and Mineralisation 5.  Previous Exploration 6.  Activity during the Reporting Period 7.  Current Resources 7.1  Juno Resource Methodology 7.2  M10 Resource Methodology 8.  Future Work 9.  References   Tables 1.  Tenement Status 2.  Current Resource Statement 3.  Previous Resource Estimate  Figures 1.  Project Location Map 2.  Tenement Location and Geology 3.  Regional Geology Map  Photos 1.  Resource Drilling at Juno 2.  Historical diamond drilling at Juno 3.  Diamond Drilling (Night shift) at the Juno project  Appendices 1.  Drill hole collar table 2.  Drill hole survey data 3.  Assay results 4.  Geological Logs 5.  Tenement Details 6.  Cube Consulting report        

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

1.  Introduction  This  report details activities undertaken by Excalibur Mining Corporation  Limited  (“Excalibur”) upon the Juno Project in the period 31st January 2010 to 30th January 2011.  2.  Location  Juno is located in central Northern Territory, some 8km east south east of Tennant Creek (Figure 1).  The area is accessed via a bitumen road from Tennant Creek.    

   

Figure1: Project Location map  

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

3  Tenement Status  The  Juno Project consists of nine  tenements. A  tenement status summary  table  is  included as table 1 below. Current (March 2011) tenement details are presented in appendix 5.   

  

Figure 2: Tenement Location and Geology.    

TENEMENT AREA (HA) GRANTED MCC284  18  08/07/1989MLC45  16  05/01/1965MLC46  10  05/01/1965MLC47  16  05/01/1965MLC68  9  18/06/1968MLC154  5  17/02/1973MLC155  6  17/02/1973MLC578  9  28/05/1968MLC579  9  28/05/1968

 Table 1: Juno project tenement status 

 

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

4  Geology and Mineralisation    The  project  area  (Figure  3)  is  located  within  the  Proterozoic  Tennant  Creek  Inlier  which  is comprised of a  turbiditic  flysch  sedimentary  sequence abutting various volcanic  rocks.    In  the Tennant  Creek  region,  these  rocks  are  typified  by  the Warramunga Group, which  commonly strikes east‐west with variable dip.  They have been intruded by various granites and deformed by the Tennant Event of 1850 Ma.  Gold‐copper‐bismuth mineralisation  has  been  found  to  be  hosted  by  fine  grained  haematitic mudstones and shaley siltstones.  The mineralisation is poddy in nature and is typically located within  steep  dipping  hinge  zones  of  regionally  minor  folds  with  localised  shearing  and accompanying  chlorite  and  silica  +/‐  dolomite  alteration.    These  dilation  zones  of  rich  gold mineralisation  are  also  typified  by  strong magnetite  alteration  below  the  base  of  oxidation.  Above the base of oxidation the magnetite is chemically weathered to haematite.  The distribution of the metals is variable, with no direct correlation between bismuth, gold and copper though some of the better known deposits display zonation.  For example, it is common to find an outer magnetite/dolomite altered copper zone, a mixed magnetite‐silica bismuth zone and magnetite + gold zone in the core.  The mineralisation style at Tennant Creek is generally small tonnage but high grade pods of iron rich mineralisation.   Gold  is also generally very  fine grained  in  fresh deposits, but very coarse and nuggety in the oxidised deposits, such as Nobles Nob.    

 Figure 3: Regional Geology Map 

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

5  Previous Exploration  Previous  exploration  within  some  of  these  tenements  has  been  extensive.    The  magnetic anomaly  that was  formed  by  the  Juno  deposit was  discovered  by  the Aerial, Geological  and Geophysical Survey of Northern Australia  in 1936.   Drilling was first conducted on this area by National Lead of America prior to 1960.  In March 1960 Peko Mines N.L acquired the tenements from Merloo Gold Mines N.L, and commenced the diamond drilling programme that ultimately discovered  the  Juno deposit  in DDH02  in October 1964.   Of  interest holes 1, 3 and 4 were all barren, whilst the deviation of hole two from its planned target saw it hit significant values that would have been missed had it stayed on course.  Exploration  drilling  activity  increased  following  the  discovery  hole  intersection  (12.19m  @ 170.11g/t Au, 30.63g/t Ag, 0.13% Cu, and 1.39% Bi, from 229.21m), with a considerable amount of  surface  and underground diamond drilling being  completed over  the  years. Ultimately  the Juno gold mine produced 839,000 oz of Au from 0.45 Mt of ore.  

 Photo 2: Historical diamond Drilling at Juno 

    

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

6  Activity during the reporting period   Excalibur’s focus during the reporting period was an independent third party validation of Juno resources. Cube Consulting of Perth were contracted to perform the review.   The  company  continued  with  a  drilling  program  to  redefine  the  resource  in  the  immediate vicinity of the Juno ore body and the underlying M10 deposit. Drilling  included 55 RC holes for 10944m and 16 diamond tails for 1282m.   All drill holes were surveyed by  licensed surveyor BBS Surveys Alice Springs and gyro surveyed by Direct Systems Melbourne. Geological logs, assays results and all survey data are attached. All on‐site activity at Juno concluded in April 2010.  Cube consulting completed their review and the results were announced to the ASX on the 4th June 2010. By August 2010 the company had terminated technical staff. No rehabilitation was undertaken during the period.   

 Photo 3: Diamond Drilling (Night shift) at the Juno project 

 

 

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

7.  Current Resources 

7.1  Juno Resource Methodology 

Historical Geopeko drilling data was validated against the original hard copy logs and combined with the more recent EXM drilling data into a single drilling database. All the historical imperial drilling data has been  transformed  into MGA  coordinate  system by Cube using  surveyed grid transformation points, and all relevant data converted to metric measurements. 

A total of 42 Excalibur and 549 historical Geopeko holes (535 underground and 14 surface holes) were  zone  coded  and used  in  the  resource  estimation. Most drilling was  selectively  sampled based on visual alteration and all  intervals  that were not sampled or assayed were assigned a nominal  background  value  of  0.005  g/t  Au,  0.0001%  Cu  and  0.0001%  Bi.  Geological interpretation was based on historical Geopeko alteration models which were modified with the more recent EXM drilling. Based on the interpreted geological model, four mineralised domains were defined on 5 metre sections. 

A total of 5,179 two metre composites were used to  interpolate the grade  into a block model with suitable gold assay top cuts applied on a domain by domain basis. 

Density was assigned  to each alteration and mineralised domain based on 2,834 bulk density measurements undertaken by Excalibur and Northern Assay Laboratories. The assigned values for mineralisation were 3.3g/cm³  for Domain 100, 3.9g/cm³  for Domain 500 and 4.0g/cm³  for Domain 800. 

Interpolation  of  block  grade  into  a  Surpac  Block Model  used  Ordinary  Kriging.  Variography analysis  and Qualitative  Kriging Neighbourhood Analysis were utilised  to  identify direction of mineralisation continuity and variogram, and also search neighbourhood parameters. 

The resultant grade block model (5mN x 10mE x 2.5mRL) was depleted by the 3D mining void as defined by original pay run mine plans and sections, with the stope and underground workings validated by 25 EXM drill holes. 

The  resource was  classified  as  Inferred,  taking  into  account  the  high  level  of  historical  assay data,  the  drill  spacing,  and  low  confidence  in  the  continuity  and  location  of  the  remnant mineralization and pillars associated with the historic stoping areas. 

7.2  M10 Resource Methodology 

A total of eight historical Geopeko holes and one Excalibur diamond drillhole were zone coded and used in the resource estimation. 

The  resource database  is  the  same drilling database used  for  Juno estimate  and all historical Geopeko  drilling  data  was  validated  against  the  original  hard  copy  logs  by  Cube,  and transformed into MGA coordinate system and metricised. 

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

Most drilling was selectively sampled based on visual alteration and all  intervals that were not sampled or assayed were assigned a nominal background value of 0.005 g/t Au, 0.0001% Cu and 0.0001% Bi. 

A  nominal  0.5g/t  Au  domain  was  interpreted  on  10m  spaced  sections  based  on  historical Geopeko  alteration models  These  boundaries  were  domained  only  where  there  was  lateral continuity over more than 1 section and was defined by 2 or more drill holes. This resulted in 3 grade domains being defined. 

A total of 265 one metre composites were use to interpolate the grade into a block model with suitable gold assay top cuts applied on a domain by domain basis. 

Density was assigned to each mineralized domain based on the Juno bulk density measurements undertaken  by  Excalibur  and  Northern  Assay  Laboratories.  The  assigned  values  for  the mineralized domains were 3.3g/cm³ with the background value set to 2.7g/cm³. 

For  blocks  in  the  model  (1mN  x  10mE  x  10mRL)  that  were  informed  by  a  minimum  of  8 composites  the  grade  was  interpolated  using  Ordinary  Kriging  (OK),  the  remainder  were assigned the average cut composite Au value for that domain. The variogram that was used was an omnidirectional variogram that was calculated for the 500 Au zone in the Juno estimation. 

The  resource was  classified  as  Inferred,  taking  into  account  the  high  level  of  historical  assay data, the drill spacing and the confidence in the grade continuity. 

 Deposit  Tonnes (Inferred)  Grade Au (Inferred)  Oz Au (Inferred) Juno  1,322,000  4.4  185,300 M10  485,000  4.2  65200        Deposit  Tonnes (Inferred)  Grade Cu (Inferred)  Tonnes Cu (Inferred) Juno  1,040,000  0.5%  5200         

Table 2 – Current Resources Statement  

The Cube re‐evaluation resulted in a massive downgrade in resources at Juno and M10. The previous reported resource is presented in table 3 for comparison.  Deposit  Tonnes  Grade Au  Oz Au Juno Indicated  1,101,300  18.68  661.488 Juno Inferred  501,850  10.68  172,340 M10 Inferred  1,117,000  6.57  235,971  

Table 3 – Previous (2009) Juno Resource Estimate    

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

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  8.  Future work  In November 2010 Excalibur commissioned SRK Consulting to perform a preliminary exploration targeting  and mineral  inventory  evaluation.  Future work  at  Juno will  be  determined  by  the outcome of this evaluation.   9.  References  Edwards,  G  C,  1987.    Structural  and  geochemical  controls  on  alteration  and mineralisation, Tennant  Creek  goldfield,  Northern  Territory,  B  Sc  Honours  thesis  (unpublished),  Monash University, Melbourne.  Jones, P, 2006.  Excalibur Tennant Creek Tenement Package Exploration Potential, August 2006.  McNeill, R. D., 1965.  Indicated Ore Reserves at Explorer 8, Peko Mines N.L. Internal Report, 28th April 1965.  Sullivan, M.P., 2009.   Combined Annual Report,  Juno Project.   For Excalibur Mining Corp. Ltd, February 2009. 

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

Appendix 6  MCC284

Tenure Type Mineral Claim (Central)Number 284

Date Effective 8/07/2004Status renew retained

Area 18 HECTGrant Date 8/07/1989

Expiry Date 7/07/2014Renewal Application Date

Renewal Grant Date 20/10/2004

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/12/1986 10Grant 08/07/1989 07/07/1999 10Gazettals 05/09/1990Renewal Application 24/03/1999 5Renewal Details 08/07/1999Renewal Grant 09/08/2000 07/07/2004 5Renewal Application 09/02/2004 10Renewal Details 08/07/2004Renewal Grant 20/10/2004 07/07/2014 10Advertisements

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC45

Tenure Type Mineral Lease (Central)Number 45

Date Effective 1/01/2011Status renew retained

Area 16 HECTGrant Date 5/01/1965

Expiry Date 31/12/2010Renewal Application Date 17/08/2010

Renewal Grant Date

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/11/1964 21Grant 05/01/1965 31/12/1985 21Gazettals 22/01/1965Renewal Application 19/06/1985 5Renewal Grant 01/01/1986 31/12/1990 5Renewal Application 26/06/1990 10Renewal Grant 07/10/1992 31/12/2000 10Renewal Application 04/10/2000 10Renewal Details 01/01/2001Renewal Grant 06/03/2001 31/12/2010 10Renewal Application 17/08/2010 10Survey Plan 27/08/2010Renewal Details 01/01/2011

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC46

Tenure Type Mineral Lease (Central)Number 46

Date Effective 1/01/2011Status renew retained

Area 10 HECTGrant Date 5/01/1965

Expiry Date 31/12/2010Renewal Application Date 17/08/2010

Renewal Grant Date

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/11/1964 21Grant 05/01/1965 31/12/1985 21Gazettals 22/01/1965Renewal Application 19/06/1985 5Renewal Grant 01/01/1986 31/12/1990 5Renewal Application 26/06/1990 10Renewal Grant 07/10/1992 31/12/2000 10Renewal Application 04/10/2000 10Renewal Details 01/01/2001Renewal Grant 06/03/2001 31/12/2010 10Renewal Application 17/08/2010 10Survey Plan 27/08/2010Renewal Details 01/01/2011

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC47

Tenure Type Mineral Lease (Central)Number 47

Date Effective 1/01/2011Status renew retained

Area 16 HECTGrant Date 5/01/1965

Expiry Date 31/12/2010Renewal Application Date 17/08/2010

Renewal Grant Date

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/11/1964 21Grant 05/01/1965 31/12/1985 21Gazettals 22/01/1965Renewal Application 19/06/1985 5Renewal Grant 01/01/1986 31/12/1990 5Renewal Application 26/06/1990 10Renewal Grant 07/10/1992 31/12/2000 10Renewal Application 04/10/2000 10Renewal Details 01/01/2001Renewal Grant 06/03/2001 31/12/2010 10Renewal Application 17/08/2010 10Survey Plan 27/08/2010Renewal Details 01/01/2011

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC68

Tenure Type Mineral Lease (Central)Number 68

Date Effective 1/01/2009Status renew retained

Area 9 HECTGrant Date 18/06/1968

Expiry Date 31/12/2033Renewal Application Date

Renewal Grant Date 10/11/2008

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/10/1967 21Grant 18/06/1968 31/12/1988 21Gazettals 26/06/1968Renewal Application 30/06/1988 10Renewal Grant 31/08/1992 31/12/1998 10Renewal Application 16/09/1998 10Renewal Grant 28/10/1999 31/12/2008 10Renewal Application 22/09/2008 25Renewal Grant 10/11/2008 31/12/2033 25Renewal Details 01/01/2009Survey Plan 27/08/2010

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC154

Tenure Type Mineral Lease (Central)Number 154

Date Effective 1/01/2004Status renew retained

Area 5 HECTGrant Date 17/02/1973

Expiry Date 31/12/2024Renewal Application Date

Renewal Grant Date 22/09/2003

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 10/11/1972 21Grant 17/02/1973 31/12/1993 21Renewal Application 07/10/1993 8Renewal Grant 12/12/1994 31/12/1998 5Renewal Application 16/09/1998 10Renewal Grant 05/04/2000 31/12/2003 5Renewal Application 01/07/2003 5Renewal Grant 22/09/2003 31/12/2024 21Renewal Details 01/01/2004Gazettals

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC155

Tenure Type Mineral Lease (Central)Number 155

Date Effective 1/01/2004Status renew retained

Area 6 HECTGrant Date 17/02/1973

Expiry Date 31/12/2024Renewal Application Date

Renewal Grant Date 22/09/2003

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 10/11/1972 21Grant 17/02/1973 31/12/1993 21Renewal Application 07/10/1993 8Renewal Grant 12/12/1994 31/12/1998 5Renewal Application 16/09/1998 10Renewal Grant 05/04/2000 31/12/2003 5Renewal Application 01/07/2003 5Renewal Grant 22/09/2003 31/12/2024 21Renewal Details 01/01/2004Gazettals

19

Page 20: Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011...Interpolation of block grade into a Surpac Block Model used Ordinary Kriging. Variography analysis and Qualitative Kriging

Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

MLC578

Tenure Type Mineral Lease (Central)Number 578

Date Effective 1/01/2009Status renew retained

Area 9 HECTGrant Date 28/05/1968

Expiry Date 31/12/2033Renewal Application Date

Renewal Grant Date 10/11/2008

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/10/1967 21Grant 28/05/1968 31/12/1988 21Gazettals 05/06/1968Renewal Application 30/06/1988 10Renewal Grant 31/08/1992 31/12/1998 10Renewal Application 16/09/1998 10Renewal Details 20/08/1999Renewal Grant 28/10/1999 31/12/2008 10Renewal Application 22/09/2008 25Renewal Grant 10/11/2008 31/12/2033 25Renewal Details 01/01/2009Survey Plan 27/08/2010

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Excalibur Mining Corp Ltd - Juno Annual Technical Report 2011

21

MLC579

Tenure Type Mineral Lease (Central)Number 579

Date Effective 1/01/2009Status renew retained

Area 9 HECTGrant Date 28/05/1968

Expiry Date 31/12/2033Renewal Application Date

Renewal Grant Date 10/11/2008

Holders InformationName Percent Type M & M WALTER CONSULTING ContactTENNANT GOLD PTY LTD 100.00% Current Holder

Transactional History InformationTransaction Type Effective Date Expiry Date Period Area (km2) Application 09/10/1967 21Grant 28/05/1968 31/12/1988 21Gazettals 05/06/1968Renewal Application 30/06/1988 10Renewal Grant 31/08/1992 31/12/1998 10Renewal Application 16/09/1998 10Renewal Grant 28/10/1999 31/12/2008 10Renewal Application 22/09/2008 25Renewal Grant 10/11/2008 31/12/2033 25Renewal Details 01/01/2009Survey Plan 27/08/2010