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TESORO GOLD LTD — Capital/Financing Update 2021
Apr 15, 2021
65957_rns_2021-04-15_648d4cd3-6185-4995-a88f-20125dac87f5.pdf
Capital/Financing Update
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A S X A N N O U N C E M E N T 1 6 A P R I L 2 0 2 1
ASX: TSO | ACN 106 854 175
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Geophysics Survey Expands Gold Potential at El Zorro
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Expanded Gradient Array Induced Polarisation ( GAIP ) survey completed at El Zorro, expanding the previous GAIP survey by 750m to the north-east and 2km to the north-west.
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High chargeability anomaly trends identified, coinciding with favourable gold host rocks and mineralised fault systems, adding additional gold targets to the EL Zorro Gold Project.
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The GAIP survey confirms the structural framework controlling gold mineralisation at Ternera, and the broader El Zorro District.
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Highlights increasing scale of the project with new additional undrilled targets.
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The gold mineralisation trend is now confirmed over 4km north-to-south and 2km east-to-west.
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Detailed surface mapping and sampling underway on the new geophysical targets to define high priority zones for follow-up drill testing.
Tesoro Resources Limited ( ASX: TSO ) ( Tesoro or the Company ) is pleased to announce results of an expanded geophysical GAIP survey at the El Zorro Gold Project ( El Zorro ) in Chile.
GAIP surveying was carried out to expand the previously GAIP surveyed area (see TSO’s ASX announcements of 10 August 2020 and 16 December 2020) by 750m to the north-east and 2km to the north-west. Forty-one (41) lines of GAIP surveying using 50m spaced survey lines and 25m station spacing have been completed along north-east and south-west oriented survey lines (Figure 1).
GAIP survey data was acquired by Quantec Geoscience (Chile) and processed and interpreted by geophysical consultants Resource Potentials Pty Ltd (Perth). IP surveying measures both chargeability and electrical resistivity of the subsurface.
Results from the expanded GAIP survey have been correlated to existing drilling results and geological mapping, which indicates that IP surveying is effective for targeting high-grade gold bearing structures at El Zorro. This GAIP survey extension has identified multiple prospective northsouth trending fault zones which are known to host gold mineralisation at Ternera. The survey also highlighted a high chargeability anomaly in the north of the expanded survey grid, which coincides with a previously unknown zone of outcropping El Zorro Tonalite ( EZT ), the main gold hosting lithology at El Zorro.
Tesoro Managing Director Zeff Reeves commented:
“GAIP surveying is proving to be an invaluable tool for assisting gold exploration at El Zorro and the result of this expanded survey has provided immediate exploration upside with the identification of a previously unknown, outcropping zone of the EZT, the main gold host at El Zorro. The Tesoro team have had recent success delineating the Ternera East target using GAIP surveying and now we have uncovered a promising new target approximately 1.5km north of Ternera using the same method. This new target highlights the potential of El Zorro to continue to expand in scale with the
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ASX Announcement 16 April 2021
prospective rock types and structures now mapped out to be continuous over a strike length of 4km and open in all directions”.
El Zorro Induced Polarisation Survey
At Ternera, high-grade gold mineralisation is associated with quartz veins and breccias having a high sulphide content and is therefore conducive for detection by IP surveying techniques. GAIP surveying provides a 2D map of chargeability and resistivity/conductivity trends in the underlying geology over a survey grid area and is effective in the top 150m from land surface. GAIP surveying has also been used successfully to identify linear features, which correlate with gold bearing fault zones at El Zorro.
The expanded El Zorro IP survey consisted of 41 lines (approx. 30.3 line kms) of GAIP surveying using 50m line spacing and 25m station spacing (Figure 1).
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Figure 1 – GAIP survey extension area (thick yellow outline) with survey lines (orange), expanding survey coverage to the north-east from the older GAIP survey coverage (thin green outline), shown on a geology map of El Zorro. Coloured dots are Tesoro drill collar locations coloured to g-m gold intercepts. Datumprojection is PSAD56/19S.
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ASX Announcement 16 April 2021
GAIP Results
The GAIP survey data have been processed to produce chargeability and resistivity (and conductivity) anomaly maps over the El Zorro area, which now cover Ternera, Ternera East, Toro Blanco, Drone Hill and Toro Gordo (Figure 2). Multiple chargeability anomalies and structural trends have been identified within the expanded survey area, with a significant chargeable anomaly trend being directly correlated to high grade gold from drill results at Ternera (Figure 2).
Tesoro has successfully used the GAIP data to delineate the recently confirmed gold mineralisation at Ternera East (ASX announcement 13 April 2021), as well as more than triple the size of the drilled mineralised footprint at Ternera. The GAIP survey has been particularly useful for identifying and targeting north-south trending fault zones thought to be the primary control on gold mineralisation at El Zorro and are also highlighting linking east-west mineralised structures between north trending faults.
By correlating the Company’s structural and GAIP model results to drilling, this has further refined the exploration model for Ternera and the broader El Zorro Gold Project, with the new GAIP results identifying what the Company believes to be a highly prospective target located approximately 1.5km north of Ternera and adjacent to the Toro Blanco target. This new target is characterised by a similar anomaly pattern in the GAIP survey results, which defines the main Ternera mineralised zone and the Ternera East target. Furthermore, the new target is coincident with north-south trending fault zones, traceable from the Ternera gold zone, located some 1.5km to the north. Initial field mapping has identified a 200m wide, strongly altered and fractured EZT body, coincident with the new GAIP anomaly.
Additional new targets have also been identified in the GAIP anomaly images to the east, and the Ternera East target has been extended north by approximately 500m (Figure 2).
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ASX Announcement 16 April 2021
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Figure 2 – El Zorro map of GAIP chargeability response with a half vertical derivative filter, showing high chargeability anomalism represented by warm colours. Ternera drill collars are colour coded to gram-metre gold intercepts. Existing gold targets shown as blue dashed lines and new targets shown as pink dashed lines. A swarm of north-trending master faults are drawn on top as dashed black lines, and this faulting and veining pattern is characteristic of granite hosted intrusive related gold deposits.
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ASX Announcement 16 April 2021
Chargeability – is a measure of the ability of minerals within the rock to store an electrical charge on the boundaries of conductive minerals and is closely associated with disseminated sulphide mineralisation. In general, chargeability highs are associated with high sulphide content or graphitic units.
Resistivity – is a measure of how rock material can resist the flow of electrons in the rock, and the inverse of this is electrical conductivity. High resistivity (equivalent to low conductivity) is often associated with silica-rich zones or increased quartz veining and fracturing. Low resistivity (equivalent to high conductivity) is associated with high sulphide content, clays formed by weathering or fractured rock, or by graphitic units.
Next Steps
Results from the expanded GAIP survey program have highlighted additional undrilled targets, as well as the potential for the gold mineralisation to continue for over 1.5km north of Ternera. Initial detailed surface mapping and sampling is already underway with a view to assess each target area for drilling in the next 6 to 8 weeks, should field inspection results be positive.
Drilling at Ternera continues 24/7, with assay results pending for 32 holes.
Authorised by the Board of Tesoro Resources Limited.
For more information:
Company: Investors: Zeff Reeves Peter Taylor Managing Director NWR Communications Tesoro Resources Limited +61 (0) 412 036 231 +61 8 9322 1587 [email protected]
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ASX Announcement 16 April 2021
About Tesoro
Tesoro Resources Limited was established with a strategy of acquiring, exploring, and developing mining projects in the Coastal Cordillera region of Chile. The Coastal Cordillera region is host to multiple world class copper and gold mines, has well established infrastructure, service providers and an experienced mining workforce. Large areas of the Coastal Cordillera remain unexplored due to the unconsolidated nature of mining concession ownership, but Tesoro, via its in-country network and experience has been able secure rights to a district scale gold project in-line with the Company’s strategy. Tesoro’s 95% owned Chilean Subsidiary owns 85% of the El Zorro Gold Project.
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Competent Persons Statement
The information in this report that relates to Geophysical Results is based on information compiled by Dr Jayson Meyers who is a Fellow of the Australian Institute of Geoscientists. Dr Meyers is a consultant to Tesoro Resources Limited and 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. Dr Meyers consents to the inclusion in this report of the matters based on information provided by him and in the form and context in which it appears. Dr Meyers does not hold any securities in the Company.
Future Performance
This announcement may contain certain forward-looking statements and opinion. Forward-looking statements, including projections, forecasts and estimates, are provided as a general guide only and should not be relied on as an indication or guarantee of future performance and involve known and unknown risks, uncertainties, assumptions, contingencies and other important factors, many of which are outside the control of the Company and which are subject to change without notice and could cause the actual results, performance or achievements of the Company to be materially different from the future results, performance or achievements expressed or implied by such statements. Past performance is not necessarily a guide to future performance and no representation or warranty is made as to the likelihood of achievement or reasonableness of any forward-looking statements or other forecast. Nothing contained in this announcement nor any information made available to you is, or and shall be relied upon as, a promise, representation, warranty or guarantee as to the past, present or the future performance of Tesoro.
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ASX Announcement 16 April 2021
Appendix 1 – JORC TABLES
Section 1: Sampling Techniques and Data
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Sampling techniques |
• 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. |
IP data collected using an Iris Elrec system and 15KVa transmitter using standard methods for Gradient Array IP and Dipole-Dipole IP surveying, data were quality checked by Quantec and geophysical consultants in Perth, Australia, and were considered to be of excellent quality Tesoro has completed 128 diamond drill holes for 39,579m in 2017, 2018, 2020 and 2021 (ZDDH0001 to ZDDH00128). Diamond drill holes were drilled with HQ. Sampling was half core at geologically defined and significant mineralisation boundaries. Tesoro considers the sampling methodologies to be appropriate for this style of mineralisation. |
| • Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used. |
Tesoro Diamond drill holes were drilled with HQ. Sampling was half core at geological and significant mineralisation boundaries. Tesoro consider this appropriate for the style of mineralisation. |
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| • 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. |
Diamond drilling was used to obtain ½ core samples of various lengths (minimum 0.25m), from which 1kg of material was pulverised passing 200 mesh to produce a 50g charge for fire assay fusion with a gravimetric finish. Multielement assays were completed by 4-acid digest with a 2.5g charge. Tesoro consider these appropriate assay techniques. |
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| Drilling techniques | • 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.). |
Tesoro has completed 128 diamond drill holes for 39,579m. Diamond drill holes were drilled with HQ. Sampling was half core at geological and significant mineralisation boundaries. Standard tube was used. |
| Drill sample recovery |
• Method of recording and assessing core and chip sample recoveries and results assessed. |
Core recovery was estimated using the drillers recorded depth marks against the length of the core recovered. Reviewing the core photos, there are occasional shears/faults where core is broken. There is however no significant core loss. |
| • Measures taken to maximise sample recovery and ensure representative nature of the samples. |
A single tube system was employed and in general core recovery good. |
|
| • 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. |
There appears to be no potential sample bias as there was no regular loss of core. |
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| 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. |
Geological core logging to a resolution of 25 cm was undertaken with a record kept of, inter alia, colour, lithology, weathering, grain size, mineralisation, alteration, geotechnical characteristics etc. Diamond core is stored at the Company’s warehouse. Tesoro consider the data to be of an appropriate level of detail to support a future resource estimation. |
| • Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc.) photography. |
Logging of diamond core was qualitative and diamond core was photographed. |
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| • The total length and percentage of the relevant intersections logged. |
All drilled intervals are logged and recorded. | |
| Subsampling techniques and sample preparation |
• If core, whether cut or sawn and whether quarter, half or all core taken. |
Drill core was cut, and half core was collected for analysis |
| • If non-core, whether riffled, tube sampled, rotary split, etc. and whether sampled wet or dry. |
Tesoro has not completed any percussion drilling. |
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ASX Announcement 16 April 2021
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| • For all sample types, the nature, quality and appropriateness of the sample preparation technique. |
Collection of half core ensured the nature, quality and appropriateness of the collected sample. The sample preparation of crushing half core at the lab to mm size prior to splitting off a 50g charge (either by cone/quarter or riffle) for pulverisation provides an appropriate and representative sample for analysis. |
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| • Quality control procedures adopted for all subsampling stages to maximise representivity of samples. |
Half core was collected for the entirety of the Tesoro drilling, as such there was consistency throughout the drilling. Core was logged by a qualified geoscientist. Each subsample is considered to be representative of the interval. |
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| • 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. |
Sampling of half core is representative of the in-situ material. There are field duplicate samples collected from the diamond core with irregular results. Field drill core duplicates are irregular by nature and it has been recommended by Tesoro’s consultants to use coarse reject material to monitor the samplepreparation. |
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| • Whether sample sizes are appropriate to the grain size of the material being sampled. |
sample sizes collected were considered appropriate to reasonably represent the material being tested. |
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| 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. |
Assays were undertaken at the accredited laboratories at Bureau Veritas, Santiago and ALS Santiago, both of which are fully certified. Core samples of various lengths were assayed (minimum 0.25m) from which 1kg of material was pulverized passing 200 mesh to produce a 50 g charge for fire assay fusion with gravimetric finish. Multielement assays were completed by 4-acid digest with a 2.5 g charge. All techniques are appropriate for the element being determined. |
| • 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. |
Standard chemical analyses were used for grade determination. All surveys were ground-based Induced Polarisation (IP) surveys. Data was collected by Quantec Geoscience (Chile), 30 line km of GAIP using an Iris Elrec-Pro receiver and Iris VIP 10000 receiver. |
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| • 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. |
El Zorro Project QAQC procedures included the insertion of Certified Reference Materials (CRMs) (5%) and blank material (2%), Check samples (5%) and check assaying 5% Cube Consulting Pty Ltd manage the database for Tesoro and note in there The laboratories used have generally demonstrated analytical accuracy at an acceptable level within 95% confidence limits. |
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| Verification of sampling and assaying |
• The verification of significant intersections by either independent or alternative company personnel. |
A number of independent consulting geoscientists (Cube Consulting, Oliver, and Cooley) external to Tesoro have verified the intersections for holes ZDDH0001 to ZDDH0016. Holes ZDDH0017 onwards have been verified by multiple appropriately qualified Company personnel.. |
| • The use of twinned holes. | no twinned holes have been completed | |
| • Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. |
Tesoro drilling is digitally entered and stored following documented core handling protocols. . The protocols are considered adequate. Geophysical survey data are recorded as contoured plans and sections with original source data files stored electronically |
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| • Discuss any adjustment to assay data. | No adjustments were made to Tesoro Drilling | |
| Location of data points |
• Accuracy and quality of surveys used to locate drillholes (collar and downhole surveys), trenches, mine workings and other locations used in Mineral Resource estimation. |
Tesoro drill hole collars have been surveyed accurately using differential GPS for holes ZDDH0001 to ZDDH00016. Holes ZDDH0017 onwards have been surveyed using handheld GPS and will be surveyed using differential GPS once the drill program has concluded. Geophysical survey lines are orientated and located using GPS |
| • Specification of thegrid system used. | Thegrid system used PSAD56 19S | |
| • Quality and adequacy of topographic control. | The topography generated from the historical data has been used for the current control. A new topographic survey is planned. |
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| Data spacing and distribution |
• Data spacing for reporting of Exploration Results. |
Drill hole spacing is variable between 40m and 200m |
| • Whether the data spacing and distribution is sufficient to establish the degree of geological andgrade continuity appropriate for the |
The spacing of drill holes is variable and satisfactory for reconnaissance level drilling. The holes are not intended to be used for resource estimates at this stage of exploration. |
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ASX Announcement 16 April 2021
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied. |
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| • Whether sample compositing has been applied. |
Sample composites was not employed. | |
| 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. |
Drill holes were drilled across the interpreted strike of the mineralization IP survey lines were orientated perpendicular to the interpreted strike of thegeology |
| • 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. |
Tesoro diamond drilling at various orientations does not reveal any bias regarding the orientation of the mineralised horizons. |
|
| Sample security | • The measures taken to ensure sample security. |
Chain of Custody of digital data is managed by the Company. Physical material was stored on site and, when necessary, delivered to the assay laboratory. Thereafter laboratory samples were controlled by the nominated laboratory which to date has been Bureau Veritas and ALS Santiago. All sample collection was controlled by digital sample control file(s) and hardcopyticket books. |
| Audits or reviews | • The results of any audits or reviews of sampling techniques and data. |
No audits have been undertaken. |
(Criteria in this section apply to all succeeding sections)
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. |
Information regarding tenure is included in the company’s December 2020 half yearly report released to the ASX on 12 March 2021 Tesoro Resources Ltd, 95% owned Chilean subsidiary, Tesoro Mining Chile SpA, owns 85% of the El Zorro Gold Project Concessions. |
| • 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 Concession is believed to be in good standing with the governing authority and there is no known impediment to operatingin the area. |
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| Exploration done by other parties |
• Acknowledgment and appraisal of exploration by other parties. |
Little historical exploration has been undertaken in either project area. Coeur d’Alene’s Chilean exploration division undertook activities on the Coquetas prospect, under an option agreement with theprevious owners between April 1990 and January1993. |
| Geology | • Deposit type, geological setting and style of mineralisation. |
The mineralisation model is to likely to be intrusive related gold deposit. The key characteristics that are consistent with this style deposit include: • Low sulphide content, (typically <5%); reduced ore mineral assemblage that typically comprises pyrite and lacks primary magnetite or hematite • Mineralisation occurs as sheeted vein deposits or stockwork assemblages and often combine gold with variably elevated Bi, W, As, Mo, Te, and/or Sb but low concentrations of base metals as seen in the initial four holes by Tesoro at El Zorro • Restricted and commonly weak proximal hydrothermal alteration • Intrusions of intermediate to felsic composition. |
| Drillhole information |
• A summary of all information material to the understanding of the exploration results including a tabulation of the following information for all Material drillholes: o easting and northing of the drillhole collaro elevation or RL (Reduced Level – elevationabove sea level in metres) of the drillhole collar o dip and azimuth of the holeo downhole length and interception depth |
See prospectus dated 30thOctober 2019 lodged by Plukka Ltd |
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ASX Announcement 16 April 2021
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
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. |
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| 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. |
El Zorro:No cutting of grades has been undertaken at this early stage of exploration. Channel intercepts are calculated using a length weighted averaging method. |
| • 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. |
Along Channel length weighted average results are calculated using a 0.20g/t Au cut off and a maximum of 5m internal dilution |
|
| • The assumptions used for any reporting of metal equivalent values should be clearly stated. |
No metal equivalents are reported. | |
| 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 drillhole angle is known, its nature should be reported. |
EL Zorro:The mineralisation forms sub-vertical sheeted veins and individual veins and may form plunging zones within the mineralised structures. Drilling and sampling by Tesoro has been undertaken to test these orientations. |
|
| • If it is not known and only the downhole lengths are reported, there should be a clear statement to this effect (e.g. ‘downhole length, true width not known’). |
EL Zorro:Exploration results are reported as along channel widths as the true width is not known with any certainty. |
|
| 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 drillhole collar locations and appropriate sectional views. |
Relevant maps and diagrams are included in the body of the report. |
| 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 assay results from sampling are 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 material exploration data is reported in the body of the report. |
| Further work | • The nature and scale of planned further work (e.g. tests for lateral extensions or depth extensions or large-scale step-out drilling). |
El Zorro: Further work will be focused on drill testing the Coquetas mineralisation and additional prospects as defined in the work program. Core will be used for metallurgical testwork and resource modellingisplanned. |
| • Diagrams clearly highlighting the areas of possible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive. |
Diagrams have been included in the body of this report. |
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