W Resources PLC - Régua Commencement and Updated Régua JORC Resource
("W" or the "Company")
Régua Commencement and Updated Régua JORC Resource Estimate
· JORC resource estimate update confirms 4.47Mt at 0.27% WO3 with initial mining focused on the higher-grade areas of the orebody close to the surface.
· Operations commence to access and start trial mining of thick high-grade tungsten ore zones
· The process plant will be built on lean capital cost estimate of
· Plant configuration includes equipment from La Parrilla tailings plant, spirals from Wolf Minerals Limited and selected new equipment
JORC Resource Estimate
In preparation for the development and mine development work,
The revised JORC resource estimates are set out in the below table:
Régua Mineral Resource as at
WO3 metal (kt)
* NB: Numbers may not add exactly due to rounding.
Golder resources statement is available on the
Mining operations will commence in February with the development drives in the first of two and potentially three adits (near horizontal tunnels) to allow W to access and start mining the thick high-grade ore zones and test two different mining methods: room and pillar; and sublevel stoping. Adit mining has been contracted to Empresa Portuguesa de Obras Subterrâneas, S.A. ("EPOS"), a highly experienced Portuguese mining operator.
Ore will be trucked on the newly constructed haul road to the existing crusher plant at the process plant site. A waste landfill will be created in a nearby quarry improving the restoration stage of the benches. A contract for fixed unit cost haulage and crushing was signed in
The development of the Régua trial mine process plant is being delivered on a lean capital basis and will leverage the existing crusher plant, selected equipment from the La Parrilla tailings plant in
In the initial trial mine operation, high-grade Régua ore will be processed using crushing, mill and spiral equipment to produce an 8-12% WO3 concentrate which will then be trucked to the La Parrilla processing plant for upgrade to 60% WO3 concentrate and purification. This will maximise synergies between La Parrilla and Régua and keep the processing plant capital cost to an estimate of
"The trial mine development of Régua adds significant value to this important Portuguese tungsten mine and de-risks the project while at the same time initiating first Régua tungsten production. The development will have a positive environmental contribution with the progressive rehabilitation of an existing quarry and will create jobs in the northern region of
"It was important prior to the commencement of initial trial mine operations to update our resource estimates and it's pleasing to confirm indicated resources of 3.74m tonnes at 2,800ppm WO3 which is nearly 3-times the grade of the La Parrilla deposit in
La Parrilla has continued to increase production going into the New Year with initiative to increase production rates being rapidly implemented and due for completion in February.
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.
W Resources Plc
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The information in this report which relates to Mineral Resources is based on information provided to and compiled by Mr
Section 1: Sampling Techniques and Data
JORC Code Assessment Criteria
Nature and quality of sampling (e.g. cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as downhole 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 (e.g. '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 (e.g. submarine nodules) may warrant disclosure of detailed information.
Rock chip sampling from outcrops and trenches was performed to determine whether prospective tungsten mineralised lithology (skarn) may yield any anomalous tungsten values and not to determine average grades. These samples have not been used in this resource estimate.
Samples weighing from 500 g to 1 kg were taken from each sampling location, and its position was recorded with a hand-held GPS.
Diamond drilling was used to obtain core samples.
Sampled intervals included visual scheelite bearing mineralised skarns identified under UV light and two 1 metre samples taken immediately above and immediately below the mineralised sample.
All rock samples were bagged for shipment to the laboratory inside cotton bags with the number written on the outside. The cotton bag is put in a plastic bag which includes a tag with the sample number inside as well as the same number written on the outside of the plastic bag, in both cases in waterproof ink.
Drill type (e.g. core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc.), and details (e.g. 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.).
Core was obtained with an Acker drill rig with wireline capability.
B146 (132 mm recovered core) was used for ensuring high recovery along the weathered/fractured surficial rock mass, while otherwise PWL (85 mm recovered core) and HWL (63.5 mm recovered core) was used.
All drill holes were surveyed at the collar surface by high-resolution topographic survey. Data for Eastings, Northings and RL was recorded in PT TM06/ETRS89, WGS84-UTM-ZONE29N.
All drill holes have been subject to downhole surveying to record variations from the original hole inclination.
Surveys have been recorded at varying intervals, using EZ-Trac from Reflex Instruments.
Core was oriented in selected holes using ACT II RD from Reflex Instruments.
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 assessed visually, recorded onto a logging sheet, photographed and inserted in an Excel spreadsheet.
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 "puzzle" reconstruction, and a line was marked down the centre of the core.
Diamond core was geotechnically logged, and complete data (recovery, RQD, joint orientation, spacing, roughness and weathering) was recorded onto a logging sheet and inserted in an Excel spreadsheet.
Diamond core was geologically logged, and complete data (lithology, alteration, structural data and mineralisation) was recorded onto a coded logging sheet and inserted in an Excel spreadsheet.
All drill holes have been logged in full.
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 by diamond saw along a line marked down the centre of the core, splitting the core into two equal halves. One quarter of the PWL core and one half of the HWL core was sent for analysis and remaining core was retained in wooden core boxes for future reference.
Half and quarter core samples were sent to
At ALS facilities, samples were crushed (70%<2 mm), dried, split and pulverised (85%<75µm) to produce a representative sub sample for analysis by Aqua Regia digestion, combined ICP-MS and ICP-AES (ref. ME-MS41) and lithium borate fusion with XRF finish for tungsten (ME-XRF10).
The following elements were included in the analysis: Ag, Al, As, Au, B, Ba, Be, Bi, Ca, Cd, Ce, Co, Cr, Cs, Cu, Fe, Ga, Ge, Hf, Hg, In, K, La, Li, Mg, Mn, Mo, Na, Nb, Ni, P, Pb, Rb, Re, S, Sb, Sc, Se, Sn, Sr, Ta, Te, Th, Ti, Tl, U, V, W, Y, Zn, Zr, WO3.
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 (e.g. standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (i.e. 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.
Internationally certified standards and blanks were regularly introduced among core samples with frequency of 1 in 20 approximately.
Internal laboratory cross checking methods are implemented by ALS.
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.
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.
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 downhole 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 10 mm accuracy and
Grid system PT-TM06/ETRS89, WGS84-UTM-ZONE29N.
Topographic information has been sourced from a publicly available database ReNEP produced by
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 testing different targets and have irregular spacing.
Data spacing is irregular but is close to 40 m by 40 m which is considered sufficient to quantify mineralisation continuity and support the Mineral Resource estimate at the current assigned classification
Data spacing and distribution is currently considered by the Competent Person to be sufficient only for Indicated and Inferred Mineral Resources.
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.
The orientation of drilling is approximately perpendicular to the strike of the mineralised bodies.
The dip of the drill holes is not always perpendicular to the true dip of the skarn bodies due to local variations and deformation, so the intersections may not represent true widths. This is not considered to adversely impact the resource estimate.
The measures taken to ensure sample security.
Samples are kept in labelled wooden core boxes in a locked building.
Industry standard practices are applied.
Audits and Reviews
The results of any audits or reviews of sampling techniques and data.
Golder has not undertaken audits or reviews of the sampling techniques and data. Golder is not aware of any audits or reviews carried out by other parties.
Section 2 Reporting of Exploration Results
JORC Code Assessment Criteria
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.
At Régua, a Trial mine license CE-142 has been granted to IRP, 100% owned by
Exploration Done by Other Parties
Acknowledgment and appraisal of exploration by other parties.
Previous exploration activities were undertaken in the 1980s by "Minas de Santa Leucádia, Lda" and "Rio Tinto Finance and Exploration, Ldt." (Riofinex).
Deposit type, geological setting and style of mineralisation.
Scheelite bearing skarns within impure carbonate horizons of a pre-Ordovican greywacke-schist sequence, which has been affected by contact metamorphism from Hercynian granites.
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
Data aggregation methods
In reporting Exploration Results, weighting averaging techniques, maximum and/or minimum grade truncations (e.g. 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.
No equivalent values are used.
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 (e.g. 'downhole length, true width not known').
Drill intersections are not reported as true widths.
Where possible, maps and sections (with scales) and tabulations of intercepts should be included for any material discovery being reported if such diagrams significantly clarify the report.
All diagrams contained in this document are generated from spatial data displayed in industry standard mining and GIS packages.
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.
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.
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.
WRES and IRP have received the necessary permits to begin a trial mine at the deposit.
Section 3 Estimation and Reporting of Mineral Resources
JORC Code Assessment Criteria
Measures taken to ensure that data has not been corrupted by, for example, transcription or keying errors, between its initial collection and its use for Mineral Resource estimation purposes.
Data validation procedures used.
All drilling data is contained in an Excel database and stored by IRP. Validation in the database is set to prevent the accidental duplication, alteration or deletion of records
The database is suitable for use during this resource estimate.
Comment on any site visits undertaken by the Competent Person and the outcome of those visits.
If no site visits have been undertaken indicate why this is the case.
Golder personnel visited the project area in
No issues were identified during the site visit that prevent the declaration of Mineral Resources.
Confidence in (or conversely, the uncertainty of) the geological interpretation of the mineral deposit.
Nature of the data used and of any assumptions made.
The effect, if any, of alternative interpretations on Mineral Resource estimation. The use of geology in guiding and controlling Mineral Resource estimation.
The factors affecting continuity both of grade and geology.
IRP has carried out interpretation of the mineralisation and weathering. IRP is confident in the overall geological, weathering and mineralisation interpretation of the deposit. The mineralisation interpretation comprised 72 vertical sections aligned to azimuth N210.
Three-dimensional wireframe modelling was carried out by IRP using Surpac® software. The interpretation was imported by Golder to Vulcan software for sample flagging and constraining grade estimations.
The mineralisation consists of mineralised skarn horizons hosted within calcsilicate-altered schists and greywackes. The deposit is cross cut by a fault splitting the deposit into two separate areas. The skarn units continue across the fault although the orientation or the mineralisation is different for each fault block.
The extent and variability of the Mineral Resource expressed as length (along strike or otherwise), plan width, and depth below surface to the upper and lower limits of the Mineral Resource.
The mineralised zone is approximately 900 m long (north west-south east) by 400 m wide. The mineralisation goes from surface outcrop to approximately 300m below the surface in the deepest zone.
Estimation and Modelling Techniques
The nature and appropriateness of the estimation technique(s) applied and key assumptions, including treatment of extreme grade values, domaining, interpolation parameters, and maximum distance of extrapolation from data points. If a computer assisted estimation method was chosen include a description of computer software and parameters used.
The availability of check estimates, previous estimates and/or mine production records and whether the Mineral Resource estimate takes appropriate account of such data.
The assumptions made regarding recovery of by‑products.
Estimation of deleterious elements or other non‑grade variables of economic significance (e.g. sulphur for acid mine drainage characterisation).
In the case of block model interpolation, the block size in relation to the average sample spacing and the search employed.
Any assumptions behind modelling of selective mining units.
Any assumptions about correlation between variables.
Description of how the geological interpretation was used to control the resource estimates.
Discussion of basis for using or not using grade cutting or capping.
The process of validation, the checking process used, the comparison of model data to drill hole data, and use of reconciliation data if available.
The estimation technique used for the Mineral Resource estimation is the geostatistical method of Ordinary Kriging. Parameters were derived from variograms to estimate the average grade for WO3, As and S.
Block sizes were selected with respect to the nominal drilling spacing to support acceptable local estimation quality.
The block size selected is 10 m (X) by 10 m (Y) by 5 m (Z). The sub-block size is 2 m (X) by 2 m (Y) by 1 m (Z).
All samples were composited to 2 m for estimation purposes.
The estimation was conducted in three passes with the search size increasing for each pass.
High grade spatial restraining was applied for grade estimation of individual domains. The thresholds used to restrict high grades was based on the assessment of sample statistics and probability plots and ranged from 1.4 to 1.5% WO3. Restraining of high grades above these thresholds was within a 25 m by 25 m by 5 m search radius
Each individual domain was estimate separately and an unfolding technique was applied in the northern domains to allow the estimation to better capture mineralisation continuity within the domains
The model was validated visually and statistically using comparisons to composite data statistics, swath plots and evaluation of the grade estimation smoothing effect.
Whether the tonnages are estimated on a dry basis or with natural moisture, and the method of determination of the moisture content.
All Mineral Resource tonnages are reported on a dry basis.
The basis of the adopted cut-off grade(s) or quality parameters applied.
The resource model is constrained by assumptions about economic cut-off grades. The tabulated resources were reported using cut-off grade of 0.1% WO3 which was applied on a block by block basis.
Mining Factors or Assumptions
Assumptions made regarding possible mining methods, minimum mining dimensions and internal (or, if applicable, external) mining dilution.
It is always necessary as part of the process of determining reasonable prospects for eventual economic extraction to consider potential mining methods, but the assumptions made regarding mining methods and parameters when estimating Mineral Resources may not always be rigorous. Where this is the case, this should be reported with an explanation of the basis of the mining assumptions made.
This Mineral Resource statement assumes mining by underground stoping or benching techniques.
Metallurgical Factors or Assumptions
The basis for assumptions or predictions regarding metallurgical amenability. It is always necessary as part of the process of determining reasonable prospects for eventual economic extraction to consider potential metallurgical methods, but the assumptions regarding metallurgical treatment processes and parameters made when reporting Mineral Resources may not always be rigorous. Where this is the case, this should be reported with an explanation of the basis of the metallurgical assumptions made.
No metallurgical assumptions have been made.
Environmental Factors or Assumptions
Assumptions made regarding possible waste and process residue disposal options. It is always necessary as part of the process of determining reasonable prospects for eventual economic extraction to consider the potential environmental impacts of the mining and processing operation. While at this stage the determination of potential environmental impacts, particularly for a greenfield project, may not always be well advanced, the status of early consideration of these potential environmental impacts should be reported. Where these aspects have not been considered this should be reported with an explanation of the environmental assumptions made.
The municipality of Armamar has approved (early 2015) the new Land Use Plan. The Régua project area is included as potential for a future tungsten operation, so it is assumed that process and waste disposal infrastructures, as well as water storage, should be acceptable as part of any mining operation.
A baseline environmental study for the trial mine has been presented to the authorities and approved for obtaining the trial mining license and a complete environmental impact study is expected to be presented in early 2020 for the grant of final mining license.
Whether assumed or determined. If assumed, the basis for the assumptions. If determined, the method used, whether wet or dry, the frequency of the measurements, the nature, size and representativeness of the samples.
The bulk density for bulk material must have been measured by methods that adequately account for void spaces (vugs, porosity, etc.), moisture and differences between rock and alteration zones within the deposit.
Discuss assumptions for bulk density estimates used in the evaluation process of the different materials.
Bulk density values were assigned based on mineralisation and fault block. The bulk densities were based on immersion measurements from median density of 1,889 samples from 27 DDH were used in determining the assigned values.
Dry bulk density ranges from 2.87 to 2.90 t/m3 for fresh material.
The basis for the classification of the Mineral Resources into varying confidence categories.
Whether appropriate account has been taken of all relevant factors, i.e. relative confidence in tonnage/grade estimations, reliability of input data, confidence in continuity of geology and metal values, quality, quantity and distribution of the data.
Whether the result appropriately reflects the Competent Person(s)' view of the deposit.
§ Measured Resources: Due to the data scarcity and complexity of parts the mineralisation lode system, no Measured material has been defined for Régua deposit.
§ Indicated Resources: the area of Régua deposit classified as Indicated Resources;
- Grades are estimated in Pass 1 or Pass 2.
- Mineralised domain intersected by more than 2 drill holes
§ Inferred Resources: all remaining estimated blocks, generally represented by discontinuous and geologically complex zones with poor drilling coverage.
Audits or Reviews
The results of any audits or reviews of Mineral Resource estimates.
No audits or reviews have been undertaken on this Mineral Resource estimate.
Discussion of Relative Accuracy/Confidence
Where appropriate a statement of the relative accuracy and confidence level in the Mineral Resource estimate using an approach or procedure deemed appropriate by the Competent Person. For example, the application of statistical or geostatistical procedures to quantify the relative accuracy of the resource within stated confidence limits, or, if such an approach is not deemed appropriate, a qualitative discussion of the factors that could affect the relative accuracy and confidence of the estimate.
The statement should specify whether it relates to global or local estimates, and, if local, state the relevant tonnages, which should be relevant to technical and economic evaluation. Documentation should include assumptions made and the procedures used.
These statements of relative accuracy and confidence of the estimate should be compared with production data, where available.
The relative accuracy is reflected in the Mineral Resource classification discussed above that is in line with industry acceptable standards.
This information is provided by RNS, the news service of the
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