REG - Thor Mining PLC - Ragged Range Historic Stream Sediment Samples

Thor EnergyAnnouncement

08/10/2020 07:15

RNS Number : 4904B
  
Thor Mining PLC
  
08 October 2020
  
 

THOR MINING PLC
PILBARA GOLDFIELDS RAGGED RANGE PROJECT
HISTORIC STREAM SEDIMENT SAMPLES CORRELATE WITH 13KM GOLD TREND
 
The directors of Thor Mining Plc ("Thor") (AIM, ASX: THR) are pleased to announce the correlation of anomalous historic stream sediment results to those results  recently collected by Thor over their 100% owned Pilbara Goldfield tenements (E46/1262 and E46/1190) in Western Australia.
 
The historic stream sediment Bulk Leach Extractable Gold (BLEG) samples collected in the mid-1990's by Great South Mines1 validates gold results from the two recent  geochemistry programs undertaken by Thor, which  delineated a 13km gold target zone along the faulted greenstone belt (ASX: THR announcement 2 September 2020). 
¹ https://geodocs.dmirs.wa.gov.au/Web/documentlist/10/Report_Ref/A50141    
 
Highlights:
§ Data review identifies anomalous historic stream sediment samples up to 68ppb (Sample No. 4057 in Table A below).
§ Historic stream sediment sampling results confirms 13km anomalous gold trend along the eastern thrust faulted mafic/ultramafic contact.
§ Samples delineating the 13km gold target zone are from separate drainage catchments supporting the potential of gold mineralisation along the entire strike length.
§ Widespread anomalous gold also prevalent across adjoining tenement EL46/1355, under application by Thor. 
§ Airborne Magnetic survey underway (Announced 6 October 2020)
§ Follow up geochemical sampling program including infill stream sediment sampling, mapping and rock chip sampling is scheduled to commence during October.
 
Mick Billing, Executive Chairman of Thor Mining, commented: 
"It is very pleasing to find further evidence of anomalous gold along the 13 kilometre target zone previously identified from this historical work."
"Evidence of anomalous gold within the new licence application area also adds potential value to the total Ragged Range suite of tenements."
"We look forward to the results of the airborne magnetic survey in progress, and the next phase of sampling, scheduled to begin shortly." 
A map showing Stream Sediment Gold results from Thor sampling and predecessor Great Southern Mines sampling may be viewed via the link below.
www.thormining.com/sites/thormining/media/maps/gsm-sediment-assays.jpg 
 
 
 
Table A: Ragged Range Historic Stream Sediment Results > 5ppb




SAMPLE MEDIUM


SAMPLE TYPE


Sample No


Easting


Northing


AU ppb




Stream sediment 


BLEG


4057


783729


7583169


68




Stream sediment 


BLEG


405


780222


7585505


53




Stream sediment 


BLEG


4070


781368


7584229


26




Stream sediment 


BLEG


1018


779499


7588818


20.5




Stream sediment 


BLEG


189


780463


7586497


16.5




Stream sediment 


BLEG


200


781068


7590713


16




Stream sediment 


BLEG


412


779372


7588160


9




Stream sediment 


BLEG


2004


786481


7579483


8.6




Easting/Northing Coordinates in GDA94/MGA Zone 50 
The information contained within this announcement is deemed to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014. Upon the publication of this announcement, this inside information is now considered to be in the public domain.
 
Enquiries:








Mick Billing


+61 (8) 7324 1935


Thor Mining PLC


Executive Chairman




Ray Ridge


+61 (8) 7324 1935


Thor Mining PLC


CFO/Company Secretary




Samantha Harrison/Niall McDonald


+44 (0) 207 383 5100


Grant Thornton UK LLP 


Nominated Adviser




Nick Emerson
 


+44 (0) 1483 413 500


SI Capital Ltd


Broker




 


 


 


 




Competent Persons Report
The information in this report that relates to exploration results is based on information compiled by Richard Bradey, who holds a BSc in applied geology and an MSc in natural resource management and who is a Member of The Australasian Institute of Mining and Metallurgy. Mr Bradey is an employee of Thor Mining PLC. He has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves'. Richard Bradey consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.
 
About Thor Mining PLC
Thor Mining PLC (AIM, ASX: THR) is a resources company quoted on the AIM Market of the London Stock Exchange and on ASX in Australia.
 
Thor holds 100% of the advanced Molyhil tungsten project in the Northern Territory of Australia, for which an updated feasibility study in August 2018¹ suggested attractive returns.
 
Adjacent Molyhil, at Bonya, Thor holds a 40% interest in deposits of tungsten, copper, and vanadium, including an Inferred resource for the Bonya copper deposit².
 
Thor is also acquiring up to a 30% interest in Australian copper development company EnviroCopper Limited, which in turn holds rights to earn up to a 75% interest in the mineral rights and claims over the resource on the portion of the historic Kapunda copper mine in South Australia recoverable by way of in situ recovery⁴. Thor also holds rights to earn a 75% interest in portion of the Moonta Copper project also in South Australia, and is also considered amenable to recovery by way of in situ recovery⁵.
 
Thor holds 100% of the Pilot Mountain tungsten project in Nevada USA which has a JORC 2012 Indicated and Inferred Resources Estimate³ on 2 of the 4 known deposits. The US Department of the Interior has confirmed that tungsten, the primary resource mineral at Pilot Mountain, has been included in the final list of Critical Minerals 2018.
 
At the 100% owned Ragged Range Project in the Pilbara region of Western Australia, Thor has exciting early stage results for which gold and nickel drilling is planned.
 
Thor holds mineral claims in  the US states of Colorado and Utah with historical high grade uranium and vanadium drilling and production results.
 
Notes
¹ Refer ASX and AIM announcement of 23 August 2018
² Refer ASX and AIM announcement of 26 November 2018
³ Refer AIM announcement of 13 December 2018 and ASX announcement of 14 December 2018
⁴ Refer AIM announcement of 10 February 2016 and ASX announcement of 12 February 2018
⁵ Refer ASX and AIM announcement of 15 August 2019
 
 
 
 
 
1   JORC Code, 2012 Edition - Table 1 report template
1.1         Section 1 Sampling Techniques and Data
 




Criteria


JORC Code explanation


Commentary




Sampling techniques


·    Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling.
·    Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used.
·    Aspects of the determination of mineralisation that are Material to the Public Report.
·    In cases where 'industry standard' work has been done this would be relatively simple (eg 'reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay'). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may warrant disclosure of detailed information.


The historic programme comprised stream sediment trap site sampling for geochemical analysis for Au 2.5kg BLEG (-20mesh/850um), and B/AAS for Cu, Pb, Zn, Ag, Sb, As, Ni, & Mn.  Bulk cyanide Leach with DIBK and graphite furnace finish for Au & Pb to 0.1ppb  




Drilling techniques


·    Drill type (eg core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard tube, depth of diamond tails, face-sampling bit or other type, whether core is oriented and if so, by what method, etc).


Not applicable




Drill sample recovery


·    Method of recording and assessing core and chip sample recoveries and results assessed.
·    Measures taken to maximise sample recovery and ensure representative nature of the samples.
·    Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material.


Not applicable




Logging


·    Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies.
·    Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography.
·    The total length and percentage of the relevant intersections logged.


No logging was undertaken




Sub- sampling techniques and sample preparation


·    If core, whether cut or sawn and whether quarter, half or all core taken.
·    If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry.
For all sample types, the nature, quality and appropriateness of the sample preparation technique.
 


Stream Sediment 2.5kg BLEG sample collected in the field for analysis
Pre-prepared 2kg BLEG standards were submitted every 30-50 samples for quality control





 

 




Criteria


JORC Code explanation


Commentary




 


·    Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples.
·    Measures taken to ensure that the sampling is representative of the in situ material collected, including for instance results for field duplicate/second-half sampling.
·    Whether sample sizes are appropriate to the grain size of the material being sampled.


 




Quality of assay data and laboratory tests


·    The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total.
·    For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc.
·    Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (ie lack of bias) and precision have been established.


The assay method is appropriate for preliminary exploration.
 
All samples were prepared and analysed by independent laboratory Genalysis in Perth, WA.
 
Samples were analysed for the following: 
1.   mix and split off 250grams for drying and pulverised to 75microns.
2.   Digestion and analysis for Cu, Pb, Zn, Ag, Sb, As, Ni, & Mn using B/AAS sample method.  
3.   Remaining 2.25 sample was Bulk cyanide Leached with DIBK and graphite furnace finish for Au & Pb to 0.1ppb  
 
Pre-prepared 2kg BLEG standards were submitted every 30-50 samples for quality control




Verification of sampling and assaying


·    The verification of significant intersections by either independent or alternative company personnel.
·    The use of twinned holes.
·    Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.
·    Discuss any adjustment to assay data.


Not undertaken




Location of data points


·    Accuracy and quality of surveys used to locate drill holes (collar and down-hole surveys), trenches, mine workings and other locations used in Mineral Resource estimation.
·    Specification of the grid system used.
·    Quality and adequacy of topographic control.


Aerial photography at 1:25,000 scale used to plan and locate drainage spots.  All drainage plotted onto 1:25,000 base and subsequently digitised into Micromine database.




Data spacing and distribution


·    Data spacing for reporting of Exploration Results.
·    Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied.
·    Whether sample compositing has been applied.


Not applicable - no resource is being reported




Orientation of data in relation to geological structure


·    Whether the orientation of sampling achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type.
·    If the relationship between the drilling orientation and the orientation of key mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material.


Orientational bias is not applicable to stream sediment sampling which are essentially one dimensional.




Sample security


·    The measures taken to ensure sample security.


Samples submitted to Intertek Genalysis Perth, WA for analysis




Sample security levels are considered appropriate for a
preliminary reconnaissance assessment.




Audits or reviews


·    The results of any audits or reviews of sampling techniques and data.


None undertaken 



 
 
 
 
 



 
Section 2 Reporting of Exploration Results
 




Criteria


JORC Code explanation


Commentary




Mineral tenement and land tenure status


·    Type, reference name/number, location and ownership including agreements or material issues with third parties such as joint ventures, partnerships, overriding royalties, native title interests, historical sites, wilderness or national park and environmental settings.
·    The security of the tenure held at the time of reporting along with any known impediments to obtaining a licence to operate in the area.


Exploration results are reported on E46/1190 and E46/1262 in Western Australia held 100% by Thor Mining PLC.
 




Exploration done by other parties


·    Acknowledgment and appraisal of exploration by other parties.


Geological mapping and stream sediment sampling by Great Southern Mines.  Open File Report A050141-Surrender Report.




Geology


·    Deposit type, geological setting and style of mineralisation.


Yet to be determined




Drill hole Information


·    A summary of all information material to the understanding of the exploration results including a tabulation of the following information for all Material drill holes:
o  easting and northing of the drill hole collar
o  elevation or RL (Reduced Level - elevation above sea level in metres) of the drill hole collar
o  dip and azimuth of the hole
o  down hole length and interception depth
o  hole length.
·    If the exclusion of this information is justified on the basis that the information is not Material and this exclusion does not detract from the understanding of the report, the Competent Person should clearly explain why this is the case.


No drilling has been undertaken or reported




Data aggregation methods


·    In reporting Exploration Results, weighting averaging techniques, maximum and/or minimum grade truncations (eg cutting of high grades) and cut-off grades are usually Material and should be stated.
·    Where aggregate intercepts incorporate short lengths of high grade results and longer lengths of low grade results, the procedure used for such aggregation should be stated and some typical examples of such aggregations should be shown in detail.
·    The assumptions used for any reporting of metal equivalent values should be clearly stated.


Only field observations have been reported. There has been no data aggregation.




 




Criteria


JORC Code explanation


Commentary




 




Relationship between mineralisation widths and intercept lengths


·    These relationships are particularly important in the reporting of Exploration Results.
·    If the geometry of the mineralisation with respect to the drill hole angle is known, its nature should be reported.
·    If it is not known and only the down hole lengths are reported, there should be a clear statement to this effect (eg 'down hole length, true width not known').


No drilling has been undertaken or reported




Diagrams


·    Appropriate maps and sections (with scales) and tabulations of intercepts should be included for any significant discovery being reported These should include, but not be limited to a plan view of drill hole collar locations and appropriate sectional views.


A sample location plan including current 1:100k scale geology has been provided with table of significant Au results




Balanced reporting


·    Where comprehensive reporting of all Exploration Results is not practicable, representative reporting of both low and high grades and/or widths should be practiced to avoid misleading reporting of Exploration Results.


All results have been reported




Other substantive exploration data


·    Other exploration data, if meaningful and material, should be reported including (but not limited to): geological observations; geophysical survey results; geochemical survey results; bulk samples - size and method of treatment; metallurgical test results; bulk density, groundwater, geotechnical and rock characteristics; potential deleterious or contaminating substances.


All data have been reported




Further work


·    The nature and scale of planned further work (eg tests for lateral extensions or depth extensions or large-scale step- out drilling).
·    Diagrams clearly highlighting the areas of possible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive.


It is anticipated that further stream sediment geochemistry and geological mapping will be undertaken in addition to airborne geophysical survey to locate the source of any mineralisation.




 
 
 

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