REG - Berkeley Energia - High grade intercepts at Zona 7 & Exploration JV <Origin Href="QuoteRef">BKY.AX</Origin> - Part 2
17/03/2017 07:07
- Part 2: For the preceding part double click ID:nRSQ7468Za
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. Duplicate splits of RC samples are taken every 10m down hole within the sampled intervals. Duplicate DD samples are taken every 10m sampling the other half portion of
core. The results from these duplicates generally show acceptable repeatability.
Whether sample sizes are appropriate to the grain size of the material being sampled. The uranium is typically very fine grained. Previous test work carried out by Berkeley using different sample sizes has demonstrated that the selected sample size is
appropriate.
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. Uranium analysis by pressed powder XRF method. This analytical method reports total uranium content.
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. Down-hole gamma logging is undertaken for all probe accessible drill holes to provide eU3O8 ("equivalent" U3O8 grade) data however, it is not currently considered of
sufficient quality to replace chemical assay data for the purposes of reporting drilling results at Zona 7.The drill intersections reported in this release are calculated
using only chemical assay data.
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. Standards, blanks and duplicates are regularly inserted into the sample stream with approximately 15-20% of all samples related to quality control. The external
laboratories used also maintain their own process of QA/QC utilising standards, pulp repeats, sample duplicates and blanks. Review of the Berkeley quality control
samples, as well as the external laboratory quality QA/QC reports, has shown no sample preparation issues, acceptable levels of accuracy and precision and no bias in the
analytical datasets.
Verification of sampling and assaying The verification of significant intersections by either independent or alternative company personnel. Reported significant intersections have been checked and verified by Senior Geological management.
The use of twinned holes. No twinned holes were drilled in the current drilling program.
Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. All primary data is recorded in templates designed by Berkeley. Assay data from the external laboratory is received in spreadsheets and downloaded directly into an Access
Database managed by the Company. Data is entered into controlled excel templates for validation. The validated data is then loaded into a password secured relational
database by a designated Company geologist. Daily backups of all digital data are undertaken. These procedures are documented in the Berkeley Technical Procedures and
Protocols manual.
Discuss any adjustment to assay data. Uranium (ppm) assays received from the external laboratory are converted to U3O8 (ppm) using the stoichiometric factor of 1.179.
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. Drill hole collar locations are surveyed by qualified surveyors (Cubica Ingeniería Metrica S.L) using standard differential GPS (DGPS) equipment achieving sub decimetre
accuracy in horizontal and vertical position. Down-hole surveys are undertaken using a Geovista down-hole deviation probe. Measurements are taken every 1cm down hole and
averaged every 10m. No strongly magnetic rocks are present within the deposit which may affect magnetic based readings.
Specification of the grid system used. The grid system is ETRS 1989 UTM Zone 29N.
Quality and adequacy of topographic control. Topographic control is based on a digital terrain model with sub metric accuracy sourced from the Spanish Geographical Institute (Instituto Geográfico Nacional) and is
verified through detailed drill hole collar surveys by a qualified surveyor using a DGPS.
Data spacing and distribution Data spacing for reporting of Exploration Results. This drilling program has been designed to cross significant mineralization.
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. The data spacing is not considered sufficient to assume geological and grade continuity, and will not allow the estimation of Mineral Resources on deep.
Whether sample compositing has been applied. No compositing of samples in the field has been undertaken.
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. Shallow parts of the deposit show that the mineralised zone strikes northeast-southwest and is interpreted to be sub-horizontal (due to post mineralisation supergene
processes) to shallowly dipping.
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. All of the RC drill holes reported in this release are vertical.All of the DD holes are inclined -86º to facilitate the core orientation measures. Due to the interpreted
flat lying nature of the mineralisation, no sampling bias is considered to have been introduced by the orientation of the drilling.
Sample security The measures taken to ensure sample security. Chain of custody is managed by Berkeley. Samples are transported from the drill site by Company vehicle to a sample preparation shed where samples are prepared for
dispatch. Samples are sent directly from the sample preparation shed to the laboratory using a certified courier or a Berkeley owned vehicle authorised for radioactive
materials transport. No other freight is transported with the samples which are taken directly from the Berkeley facility to the external laboratory. Sample submission
forms are sent in paper form with the samples as well as electronically to the laboratory. Reconciliation of samples occurs prior to commencement of sample preparation
for assaying.
Audits or reviews The results of any audits or reviews of sampling techniques and data. Sampling techniques and procedures, as well as QA/QC data, are reviewed internally an ongoing basis. Mr Malcolm Titley (Geology Consultant, Maja Mining Limited) has
independently reviewed the sampling techniques, procedures and data. He has undertaken a site visit to review and inspect the application of procedures. These reviews
have concluded that the sampling and analytical results have resulted in data suitable for incorporation into Mineral Resource estimation.
Audits or reviews
The results of any audits or reviews of sampling techniques and data.
Sampling techniques and procedures, as well as QA/QC data, are reviewed
internally an ongoing basis. Mr Malcolm Titley (Geology Consultant, Maja
Mining Limited) has independently reviewed the sampling techniques, procedures
and data. He has undertaken a site visit to review and inspect the application
of procedures. These reviews have concluded that the sampling and analytical
results have resulted in data suitable for incorporation into Mineral Resource
estimation.
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
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 Zona 7 Prospect lies on the Alisos Investigation Permit PI 6605-20 which is 100% owned by Berkeley Minera de Espana, a
wholly owned subsidiary of Berkeley Energia Limited. An application for a mining license has been applied for at Alisos. The
Alisos Investigation Permit, which was due to expire in January 2016, has been automatically extended until the mining license
is granted. No historical sites, wilderness or national parks are located within the Permit. The Zona 7 Prospect is located
adjacent to the village of Villavieja de Yeltes.
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. Tenure in the form of an Investigation Permit has been granted and is considered secure. There are no known impediments to
obtaining a licence to operate in this area.
Exploration done by other parties Acknowledgment and appraisal of exploration by other parties. Previous exploration at Zona 7 was completed initially by Junta de Energía Nuclear (JEN) and then Empresa Nacional de Uranio
S.A. (ENUSA), both Spanish state run companies, from the late 1950's through to the mid 1980's. Work completed by JEN and ENUSA
included mapping, radiometric surveys, trenching and diamond (DD) and open-hole (OH) drilling. A detailed data assessment and
verification of the historic data supplied by ENUSA has been undertaken. No significant issues with the data were detected.
Geology Deposit type, geological setting and style of mineralisation. The uranium mineralisation is hosted within Lower Cambrian metasediments adjacent to granite. The mineralisation typically
occurs as a sub-horizontal to shallowly dipping layer occurring between surface and 100m depth, although mineralisation has been
recorded to a maximum depth of 255m in the current RC holes. The style of the uranium mineralisation includes veins, stockwork
and disseminated mineralisation in joint/fracture filling associated with brittle deformation. Uraninite and coffinite are the
primary uranium minerals. Secondary uranium mineralisation is developed in "supergene-like" tabular zones corresponding to the
depth of weathering. Most of the mineralisation is hosted within partially weathered and unweathered metasediment. This deposit
falls into the category defined by the International Atomic Energy Association (IAEA) as Vein Type, Sub Type Iberian Type.
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 collaro elevation or RL (Reduced Level - elevation above sea level in metres) of the drill hole collaro dip and azimuth of the holeo down hole length and interception deptho hole length. Details of all reported drill holes are provided in Appendix B of this release.
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. All of this information is Material and has been included in Appendix B of this release.
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. Reported drill intersections are based on chemical assay data and are calculated using a 200ppm U3O8 cut-off, no high grade cut,
and may include up to 2m of internal dilution.
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. High grade intervals that are internal to broader zones of uranium mineralisation are reported as included intervals.
The assumptions used for any reporting of metal equivalent values should be clearly stated. No metal 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. All drilling is planned in such a way as to intersect expected mineralisation in a perpendicular manner. The uranium
mineralisation is interpreted to be flat lying to shallowly dipping so the majority of the RC holes have been drilled vertically
and DD holes have been drilled with -86º for core orientation purposes. The reported down-hole intervals are therefore
interpreted to approximate true widths.
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'). The reported down-hole intervals are interpreted to approximate true widths.
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. Appropriate diagrams, including a drill plan and cross sections, are included in the main body of this release.
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 are reported in Appendix B of this release.
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. Down-hole gamma logging of all holes is undertaken to provide eU3O8 data. Prior comparisons of eU3O8 data with chemical assay
data have shown that on average eU3O8 tends to underestimate at higher grades (>600ppm) and overestimate at lower grades
(<100ppm). Accordingly, the eU3O8 data is not considered of sufficient quality to replace chemical assay data for the purposes
of reporting drilling results. The drill intersections reported in this release are calculated using only chemical assay data.
Further work The nature and scale of planned further work (eg tests for lateral extensions or depth extensions or large-scale step-out drilling). Further work planned for the Zona 7 Prospect includes additional drilling will be focused on extending the mineralisation
further deep and infilling the current grid to facilitate future upgrading of the resource classification.
Diagrams clearly highlighting the areas of possible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive. These are shown in the main body of this release.
These are shown in the main body of this release.
This information is provided by RNS
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