REG - Berkeley Energia - DFS confirms Salamanca as a low cost producer <Origin Href="QuoteRef">BKY.AX</Origin> - Part 3
14/07/2016 07:31
- Part 3: For the preceding part double click ID:nRSN1376Eb
waste. In addition, the sampling was extended 3-5m up and down hole from the interpreted mineralised zone. Half or quarter core was used for sampling.Junta de Energía
Nuclear (JEN) DD core was sampled using 0.25m, 0.20m and 1.00m intervals in the mineralised zones, with 0.25m intervals being the most frequent sample length.
Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used. Standards and blanks are inserted into the sample stream to assess the accuracy, precision and methodology of the external laboratories used. In addition, field duplicate
samples are inserted to assess the variability of the uranium mineralisation. Approximately 15-20% of all samples relate to quality control. In addition, the laboratories
undertake their own duplicate sampling as part of their internal QA/QC processes. Examination of the QA/QC sample data indicates satisfactory performance of field
sampling protocols and assay laboratories providing acceptable levels of precision and accuracy. 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 5m or 10m. No strongly magnetic rocks are present
within the deposit which may affect magnetic based readings. JEN sampled whole core using 0.25m, 0.20m and 1.00m interval lengths. QA/QC protocols used are unknown.
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. RC drill samples are collected over 1m intervals, manually homogenised before being split on site using a three tier riffle splitter to provide an approximate 3-5kg
sample. In rare cases, wet samples are split using a cone and quarter method.Scintillometer measurements are taken on all samples and this data is used to select the
samples to be sent to external laboratories for sample preparation and analysis. Indicative mineralised intervals are determined from this data and the sampling extended
up and down hole by at least 2-5m. Samples are further split in the core shed using a scoop such that 0.7-1kg samples are sent to the preparation laboratories of ALS and
AGQ (Seville, Spain) and analytical laboratory of ALS (Loughrea, Ireland). Samples are dried, fine crushed down to 70% below 2mm, split to obtain 250g and pulverised with
at least 85% of the sample passing 75µm. 10g of sample is used for uranium analysis by pressed powder X-ray fluorescence (XRF) method. (2013, 2014, 2015 and 2016 drilling
campaigns). Samples from the 2007 and 2008 drilling campaigns were sent to Actlabs Canada for uranium analysis by the Delayed Neutron Counting (DNC) method. JEN core
samples were prepared in internal company laboratories and assayed for uranium using XRF, Atomic absorption spectroscopy (AAS) or fluorometric methods.
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). Berkeley drilling comprised both DD (HQ) and RC drilling using a 140mm diameter face sampling hammer. For angled DD oriented core was achieved using DeviCore measurements
(2014 and 2015 drilling campaigns).The historical JEN drilling, which accounts for approximately 15% of the total drilling, was used DD (NQ).
Drill sample recovery Method of recording and assessing core and chip sample recoveries and results assessed. Berkeley and JEN DD typically recorded overall core recoveries in excess of 90%, which is considered acceptable.Berkeley RC drill samples are collected over 1m intervals
through a cyclone. Plastic sample bags are strapped to the cyclone to maximise sample recovery. Individual sample bags are not weighed to assess sample recovery but a
visual inspection is made by the Company geologist to ensure all samples are of approximately equivalent size.
Measures taken to maximise sample recovery and ensure representative nature of the samples. The DD drilling rigs used face discharge bits to ensure a low contact between the rock and drilling fluids, minimising ore washing. Core was cut using a water saw with
care taken to ensure minimal ore loss.The RC drilling rigs utilised suitably sized compressors to ensure dry samples where possible. Plastic sample bags are strapped to
the cyclone to maximise sample recovery. Sample logs record whether the sample is dry, moist or wet.
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. Due to the solubility and mobility of the uranium minerals the use of water in core recovery in DD is controlled.There is no known relationship between sample recovery
and grade. The RC sample recoveries are of an acceptable level and no bias is expected from any sample losses.
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. Berkeley logging of DD core included recording descriptions of lithology, age, colour, oxidation, mineralisation, alteration, weathering, structures, textures, grain size
and mineralogy.Berkeley geotechnical logging of DD core included recording descriptions of integrity (recovery and RQD), materials (lithology, rock strength and depth
oxide staining), structures (type, angle, contact type, infill, weathering)Berkeley structural logging of DD core included recording descriptions of structure type,
structural angles, contact type, infill, line type and slip direction.Berkeley alteration logging of DD core included recording descriptions of metamorphic textures,
alteration mineralogy and mineralisation style.Berkeley geological logging of RC chip samples included recording descriptions of lithology, weathering, alteration and
mineralisation. A scintillometer reading of counts per second (cps) was recorded for each 1m sample (quantitative).JEN geological logging of DD core included recording
descriptions of lithology, iron oxides, sulphides, uranium mineralogy, fracturing and no recovery zones.
Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography. Geological logging is qualitative in nature. Berkeley DD core boxes and samples and RC samples and chip trays were photographed. JEN did not take photographs of drill
core.
The total length and percentage of the relevant intersections logged. All DD and RC drill holes are logged in full by Company geologists.
Sub-sampling techniques If core, whether cut or sawn and whether quarter, half or all core taken. Berkeley DD core was sampled using 0.25-1.85m intervals in the mineralised zones, including areas of internal low grade or waste. In addition, the sampling was extended 3
-5m up and down hole from the interpreted mineralised zone. Half or quarter core was used for sampling. JEN DD core was sampled using 0.25m, 0.20m and 1.00m intervals in
the mineralised zones, with 0.25m intervals being the most frequent sample length. Whole core was used for sampling.
and sample preparation If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry. Berkeley RC drill samples were collected at 1m intervals. RC intervals were sampled by splitting dry samples in the field to 3-5kg using cone and quarter method (2008 and
2013 drilling campaigns), three tier riffle splitter (2014 drilling campaign) or manually homogenised before being split on site using a three tier riffle splitter (2015
drilling campaign) and further split in the core shed to 0.7-1kg using a scoop. Where samples were wet they were dried prior to spitting. In rare cases, wet samples were
split using a cone and quarter method.
For all sample types, the nature, quality and appropriateness of the sample preparation technique. Berkeley samples (2013, 2014 and 2015 drilling campaigns) were sent to ALS and AGQ laboratories for preparation and ALS laboratories for analysis. Samples were dried,
fine crushed down to 70% below 2mm and pulverised with at least 85% of the sample passing 75µm. 10g of sample was used for uranium analysis by pressed powder XRF method.
Samples from the 2007 and 2008 drilling campaigns were sent to Actlabs Canada for uranium analysis by the DNC method. These methods are considered appropriate for this
style of uranium mineralisation. JEN core samples were prepared and assayed for uranium at internal company laboratories using XRF, AAS or fluorometric methods.
Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples. Previous field tests have determined that the sample size and method of sampling produce representative RC samples. QA/QC procedures involve the use of standards,
duplicates and blanks which are inserted into sample batches at a frequency of approximately 15-20%.Quality control procedures used by JEN are unknown.
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. The results from these duplicates generally show acceptable
repeatability,however indications of inhomogeneity were observed in a number of duplicates.
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. Berkeley assayed samples for uranium using the DNC method during the 2007 and 2008 drilling campaigns and pressed powder XRF during the 2013, 2014 and 2015 drilling
campaigns. These analytical methods report total uranium content. JEN assayed samples for uranium were completed at internal company laboratories using XRF, AAS or
fluorometric methods. No QA/QC data is available for this historical data.
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 was undertaken for all probe accessible holes drilled by Berkeley to provide eU3O8("equivalent" U3O8 grade) data. The down-hole gamma response was
converted to eU3O8 by correcting for radon, hole diameter, air/water and a deconvolution filter was also applied. eU3O8 data was only considered in the mineral resource
estimation process when chemical assay data was not available.
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 were regularly inserted into the sample stream by Berkeley, 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.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.JEN used internal
company laboratories. No QA/QC data is available for this historic data.
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 and Independent CP Malcolm Titley (Maja Mining Ltd.).
The use of twinned holes. No twinned holes were drilled for the current mineral resource estimation process.
Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. All primary data was 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.JEN primary paper data was digitalized and recoded following the Berkeley protocols. The validated data was then loaded into a password
secured relational database by a designated Company geologist.
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. Berkeley drill hole collar locations were surveyed by qualified surveyors (Cubica Ingeniería Metrica S.L) using standard differential GPS (DGPS) equipment achieving sub
decimetre accuracy in horizontal and vertical position. Berkeley down-hole surveys were undertaken using a Geovista down-hole deviation probe. Measurements were taken
every 1cm down hole and averaged every 5m or 10m. No strongly magnetic rocks are present within the deposit which may
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