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Fast Track Mine Infill Drilling Advances

10 Jul 2015 07:00

RNS Number : 6816S
W Resources PLC
10 July 2015
 



 

 

 

10 July 2015

 

 

 

 

 

W Resources Plc

("W" or the "Company")

 

 

Fast Track Mine Infill Drilling Advances at La Parrilla

 

W Resources Plc (AIM:WRES), the tungsten, copper and gold mining, exploration, development and production company with assets in Spain and Portugal, has completed the final stage of its infill diamond drilling programme at its La Parrilla Fast Track Mine ("FTM") in Spain. As part of the 2015 development programme, the rig has now been moved to the highly prospective La Parrilla West with the objective of defining a second and potentially materially higher grade open pittable resource.

La Parrilla Mine currently has an Australasian Joint Ore Reserves Committee (JORC) Inferred Resource of 46.92 Mt at 0.09% Tungsten Trioxide (WO3). The diamond core drilling for this area has now been completed and initial mining is planned to commence at the "grandmother's house" area located adjacent to the existing open pit during 2016. Grade control drilling using a reverse circulation or air core rig will commence in Q315. Initial grades from the first four of 12 holes are in line with expectations, with some significant intersections including:

· 11.26 metres at 0.170% WO3 from 66m in hole IP-15

· 16.50 metres at 0.128% WO3 from 74.5m in hole IP-16

· 17.49 metres at 0.126% WO3 from 48m in hole IP-13

· 7.53 metres at 0.108% WO3 and 0.149 % Sn from 74.1m in hole IP-13

· 17.80 metres at 0.093% WO3 and 0.115% Sn from 98.55m in hole IP-16

The diamond core rig has now moved to the highly prospective La Parrilla West area where W Resources previously intersected 32 m at 0.55% WO3 from 40 m. The objective of the programme is to drill 2-4 holes in order to better define an initial mine pit target in this large and highly prospective area.

Michael Masterman, Chairman of W Resources commented: "Infill drilling of the initial mining area is complete and the results will flow through to revised resource and reserve estimates, which we anticipate will be completed in Q415. The results were notable for higher than expected tin intersections that bodes well for tin concentrate production. We are looking to add a second higher grade open pit with the additional drilling at La Parrilla West, which has the potential to further enhance the FTM development."

A graphic showing the infill drill holes can be found on the 'La Parrilla Mine' page of the Company website www.wresources.co.uk. This includes recently drilled diamond core showing the coarse grain tungsten intersections.

Enquiries:

W Resources Plc

Michael Masterman

T: +44 (0) 20 7193 7463

www.wresources.co.uk

Grant Thornton UK LLP

Colin Aaronson / Jen Clarke / Harrison Clarke

T: +44 (0) 20 7383 5100

 

SI Capital - Joint Broker

Andy Thacker / Nick Emerson

T: +44 (0) 1483 413500

www.sicapital.co.uk

Gable Communications

Justine James

T: +44 (0) 20 7193 7463

M: +44 (0) 7525 324431

Northland Capital Partners - Joint Broker

John Howes / Abigail Wayne (Corporate Broking)

T: +44 (0) 20 7382 1100

www.northlandcp.co.uk

 

About La Parrilla

The La Parrilla project site is situated in the Extremadura region of southwest Spain, in the Provinces of Caceres-Badajoz, approximately 310 km southwest of Madrid. The site has exceptional infrastructure in place which is accessed directly from the highway along a 3 km asphalt road and is serviced by electricity and water. The project comprises a tungsten mine and a tungsten tailings project. The mine resource estimated by Golder in June 2013 is 46.92 million tonnes at 0.09% WO3, making it one of the largest tungsten deposits in the western world.

Technical information in this report and on the W website has been prepared in accordance with the JORC Code and approved for inclusion by Mr Fernando de la Fuente, who is a "qualified person" in respect of the AIM Rules for Companies with over 40 years' experience in the Exploration and Mining Geology industry. Mr de la Fuente holds a B.Sc. in Geology and a MSc in Geology from the University of Granada in Spain. He is also a member of the Spanish College of Geologists (Number 49), the Spanish Society of Mineralogy, founder member of the Spanish Society of Geology, member of the Spanish Association of Applied Geology to Mineral Deposits, member of the Society for Mining, Metallurgy and Exploration, Inc., member of PDAC.

 

 

 

Annexure 1: La Parrilla Drill Hole Collars and First Results

 

Hole ID

Easting

Northing

RL

Azimuth

Dip

Depth

(m)

From

(m)

To

(m)

Drilled width (m)

True thickness (m)

WO3%

Sn %

IP-13

751066.9

4330276.1

313.26

298

-60

85.40

48.00

68.60

20.20

17.49

0.126

0.009

and

74.10

82.80

8.70

7.53

0.108

0.149

IP-14

750998.9

4330300.9

314.83

298

-60

91.05

No intersections >0.06%WO3

IP-15

751296.9

4330179.4

315.60

298

-60

89.30

66.00

79.00

13.00

11.26

0.170

0.022

and

84.90

89.30

4.40

3.81

0.060

0.010

IP-16

750984.5

4330207.5

341.43

298

-60

120.80

74.50

92.30

17.80

15.41

0.093

0.115

and

98.55

117.60

19.05

16.50

0.128

0.012

 

JORC Code, 2012 Edition - Table 1 report

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.

· Core drilling was used to obtain core samples.

· All core was sampled in 1.4 - 3.6 m intervals. Sampling is mainly carried out over three metres intervals.

· All core samples were packed on thick plastic bags with sample reference indicated both in the outside and inside with permanent ink marker pens in the outside and inside.

· For transport the plastic bags were packed in thick plastic containers with sample reference indicated in the outside with permanent ink marker.

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).

· Drilling was undertaken with a track mounted ROLATEC RL-600 drill rig.

· PQ wireline core (85 mm recovered Æ) was used for insuring better recovery in the weathered or fractured surficial rock mass, while otherwise HQ (63.5 mm recovered Æ) was used.

· All drill holes were surveyed at the collar surface by high-resolution topographic survey. Data for Eastings, Northings and RL were recorded on UTM grid, Zone 29, datum ED50.

· All drill holes have been subject to downhole surveying, to record variations from the original inclination.

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.

· Sample recovery was measured, recorded onto a logging sheet, photographed and inserted in an Excel spreadsheet.

 

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.

· Logging was performed after core fragment reconstruction in the core trays, and a line was marked along the core axis.

· Geotechnical core logging was systematically done. Data collection (recovery, RQD, joint orientation, spacing, roughness and weathering) was recorded onto a log sheet and inserted in an Excel spreadsheet.

· Geological core logging was systematically done. Data collection (lithology, alteration, structural data mineralisation and sampling intervals) was recorded onto a log sheet and inserted in an Excel spreadsheet.

· All drill holes have been systematically logged both descriptive and stringer-coded for digital processing and output with specific software.

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.

· 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.

· The core was cut with a diamond saw along a line marked in the centre of the core, splitting the core into two equal halves. One half of the PQ-HQ core sample intervals was sent for analysis and the remaining half was kept in wooden core boxes for storage and future reference.

· All half-core samples are sent for preparation to ALS Minerals facility in Seville (Spain).

· At ALS facilities, samples were dried, crushed (70%mm) to produce a representative sub-sample for analysis.

· The resulting pulps are shipped to ALS Minerals laboratory in Loughrea (Ireland) for assay using the ME-MS81 method (30 elements by lithium borate fusion and ICP-MS). Samples exceeding the upper detection limit (10,000 ppm W) are re-assayed by the lithium borate fusion and XRF determination ME-XRF10 method at ALS Minerals laboratory in Vancouver (Canada). Tungsten assays are reported by ALS Minerals as W and converted to WO3 using a factor of 1.26108.

· The following elements were included in the analysis: W, Sn, Ba, Ce, Cr, Cs, Dy, Er, Eu, Ga, Gd, Hf, Ho, La, Lu, Nb, Nd, Pr, Rb, Sm, Sr, Ta, Tb, Th, Tm, U, V, Y, Yb, Zr.

 

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.

· Short wave UV light was used to identify the presence of scheelite in the core but was not use as a quantitative or semi-quantitative method.

· Internal laboratory cross checking methods are implemented by ALS.

· In addition internationally certified standards and blanks were regularly introduced among core samples.

· Assay data reported as per laboratory final reports and certificates.

Verification of sampling and assaying

· The verification of significant intersections by either independent or alternative company personnel.

· Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols.

· Discuss any adjustment to assay data.

· Verification of significant intersections by alternative company personnel.

· Primary logging paper sheets stored at office, data entered into Excel spreadsheets as is and coded, both stored in the server and in an external hard drive.

· All core boxes are photographed and a photo archive is maintained within the drilling database.

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.

· Drill hole collars survey by precision dGPS with GPRS on-line processing with 5 mm accuracy.

· Grid system - UTM, Zone 29, ED50.

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.

· Completed drill holes were designed for infill drilling to complete a 50 x 50 m drilling grid.

· Data spacing and distribution are sufficient to establish Mineral Resource.

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 trench orientation and the orientation of key mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material.

· Hole orientation is in general approximately perpendicular to the strike of the mineralized zones.

· The dip of the drill holes is not perpendicular to the true dip of the veins packages, so the intersections do not represent true widths.

Sample security

· The measures taken to ensure sample security.

· Samples are kept labelled and organised in a locked building.

· Industry standard practices are applied.

Audits or reviews

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

 

Section 2 Reporting of Exploration Results

(Criteria listed in the preceding section also apply to this section.)

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.

· The La Parrilla Project property consists of three mineral concessions, covering 1,000 hectares, currently owned by Iberian Resources Spain, 100% owned by W Resources, and the rights are valid until 2068.

Exploration done by other parties

· Acknowledgment and appraisal of exploration by other parties.

· Previous mineral exploration by the State owned, public and private mining/exploration companies.

Geology

· Deposit type, geological setting and style of mineralisation.

· The tungsten mineralization is structured in vein bundles within a Ring-Dyke model that was generated by the intrusive pressure of the granitic dome/batholith at depth.

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:

- easting and northing of the drill hole collar

- elevation or RL (Reduced Level - elevation above sea level in metres) of the drill hole collar

- dip and azimuth of the hole

- down hole length and interception depth

- 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.

· See Annexure 1 for drill hole information.

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.

· All grades reported are uncut.

· No metal equivalents are used or stated.

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').

· Hole intersections in the announcement are true widths. True widths of mineralized intersections have been calculated assigning an average intersection angle of the mineralized zones to the core axis of 30º.

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.

· Maps and tabulated assay results are included in the announcement.

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 comprehensively announced.

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.

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.

· Further work will include infill drilling.

 

This information is provided by RNS
The company news service from the London Stock Exchange
 
END
 
 
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