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ESTRELLA RESOURCES LIMITED — Capital/Financing Update 2014
Aug 27, 2014
64878_rns_2014-08-27_cb2f9b71-fbdb-4369-b0fa-3848d5e46485.pdf
Capital/Financing Update
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ASX ANNOUNCEMENT
Chile’s star in copper-gold
28 August 2014
ESTRELLA RESOURCES LIMITED ACN 151 155 207
AUSTRALIAN REGISTERED OFFICE: Level 51 MLC Centre 19-29 Martin Place Sydney NSW 2000 Australia
CONTACT DETAILS: Email: [email protected]
High Grade Copper intersected at Estrella’s Colupo Norte Prospect
HIGHLIGHTS
Colupo Norte:
CHILE OFFICE: Santa Beatriz 294 Providencia, Santiago, Chile
ASX CODE: ESR
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High grade copper intersected from surface at Colupo Norte;
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Shallow RC drilling program intercepts at Colupo Norte include:
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4 m @ 1.1% Cu from 1m (RCCN-02), including; 1m at 2.6% Cu from 3m; and
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o2 m @ 1.1% Cu from 8m (RCCN-02), including;- 1m at 1.5% Cu from 9m.
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Two mineralised tourmaline breccias intersected near surface; and
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125 m strike length identified and remains open along strike and depth. Colupo:
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Colupo shallow RC drilling identifies prospective tourmaline breccias; and
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Colupo maiden Mineral Resource due late September. Antucoya West:
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Large Porphyry Target drill testing ready at Antucoya West.
1. Introduction
Estrella Resources Limited ( ASX: ESR , Estrella or the Company ) is pleased to advise that it has now received the assay results from its initial 4 hole Reverse Circulation (RC) drilling program at the Colupo Norte prospect. Drilling has identified high grade copper mineralisation from surface and intersected two tourmaline breccias in the process. A strike length of 125m has been identified and mineralisation remains open along strike and depth.
In addition to the ongoing work at Colupo Norte, the Company is proceeding with obtaining its initial JORC resource at the Colupo Prospect and has undertaken a detailed review of all available data for its Antucoya West Prospect where the Company believes that there is a strong potential for a significant copper mineralised porphyry system beneath this zone
www.estrellaresources.com.au
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ASX ANNOUNCEMENT
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2. Colupo Norte
Estrella’s initial 4 hole RC drilling program has identified high grade copper mineralisation from surface at the Colupo Norte Prospect within Estrella’s flagship project, Altair. Estrella’s exploration team is pleased to report that its systematic and targeted approach has been successful in identifying further Colupo-style high grade copper mineralisation commencing near-surface.
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Mineralisation trend
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Figure 1: Trenches at Colupo Norte where shallow drilling has identified high grade copper mineralisation commencing at surface within two tourmaline breccias.
Assay results from the initial drill program have been received which demonstrates that all mineralisation is hosted within two tourmaline breccias (refer Table 1 below).
Table 1: Colupo Norte assay summary using 0.2% Cu cut-off. Note, all mineralisation is host within Tourmaline Breccias.
| Hole ID | Easting | Northing | RL | EOH | Azimuth | Dip | From (m) |
To (m) |
Interval | Cu% |
|---|---|---|---|---|---|---|---|---|---|---|
| RCCN-01 400,988 7,517,317 2075 24 230 -70 |
2 | 8 | 6 | 0.4 | ||||||
| 9 | 10 | 1 | 0.4 | |||||||
| RCCN-02 400,981 7,517,410 2075 26 230 -70 |
1 | 5 | 4 | 1.1 | ||||||
| incl | 3 | 4 | 1 | 2.6 | ||||||
| 8 | 10 | 2 | 1.1 | |||||||
| incl | 9 | 10 | 1 | 1.5 | ||||||
| RCCN-03 400,983 7,517,383 2075 20 230 -70 |
1 | 4 | 3 | 0.4 |
(Coordinates in PSAD56, zone19s)
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Table 2: Colupo Norte assay results summary without using a copper grade cut. Note, all intersections are within tourmaline breccias.
| Hole ID | Easting | Northing | RL | EOH | Azimuth | Dip | From (m) |
To (m) |
Interval | Cu% | Cu ppm |
|---|---|---|---|---|---|---|---|---|---|---|---|
| RCCN-01 400,988 7,517,317 2075 24 230 -70 |
0 | 13 | 13 | 0.2 | |||||||
| 18 | 23 | 5 | 0.2 | ||||||||
| RCCN-02 400,981 7,517,410 2075 26 230 -70 |
0 | 10 | 10 | 0.8 | |||||||
| RCCN-03 400,983 7,517,383 2075 20 230 -70 |
0 | 5 | 5 | 0.3 | |||||||
| 8 | 12 | 4 | - | 658 | |||||||
| 14 | 17 | 3 | - | 881 |
(Coordinates in PSAD56, zone19s)
The Colupo Norte Prospect is 2.8 km north northwest of the Colupo Prospect with both Prospects having easy vehicle access. Estrella’s exploration team identified copper oxide mineralisation at Colupo Norte in January 2014 (refer ASX announcement 28 January 2014). The initial interest in Colupo Norte followed regional hyperspectral image processing that Estrella undertook across the Altair Project and identified similar alteration zones expressed at surface to those observed at Colupo. Subsequent mapping of trenches at Colupo Norte revealed one tourmaline breccia with copper oxide in a similar fault setting to Colupo. The hyperspectral work identified numerous other similar alteration zones which Estrella’s exploration team is currently assessing with field visits.
The purpose of the RC drill program at Colupo Norte was to cost-effectively penetrate the ‘Caliche’ gravel cover to identify occurrences of tourmaline breccias and test the near-surface mineralisation potential of the copper oxide. Three of the four holes drilled at Colupo Norte intersected mineralised tourmaline breccias as shown in Tables 1 and 2. Three drill holes were drilled to 20 metres depth, with the maximum depth drilled to 26 metres (hole RCCN-02). The fourth hole was drilled in the opposite direction to test the dip direction of the tourmaline breccias. No mineralisation was intersected and the dip was confirmed to be to the northeast.
Estrella is greatly encouraged by the results from the shallow RC drill holes because holes RCCN-01, 02 and 03 each intersected two mineralised tourmaline breccias (where previously only one was thought to occur) along a 125 metre strike length. The system remains open along strike and at depth.
The hyperspectral image processing technique has identified approximately a dozen other targets within the same 30 km trend along the Buey Muerto Fault Zone (BMZ) upon which both Colupo and Colupo Norte are situated. Estrella’s exploration team is rapidly assessing each target in the field to be ready for drill testing in October. Some of the targets identified lie within Estrella’s 100% owned tenements and will be announced to the market once the field program is completed and all information has been collated.
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Figure 2: Strong copper oxide mineralisation within a tourmaline breccia from surface at Colupo Norte.
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Figure 3: Locality map of Estrella’s Altair Project in Region II, northern Chile (Map Datum WGS84 Zn19s).
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3. More Tourmaline breccias identified at Colupo
Assay results have also been received for the 21 shallow RC drill holes from the program at Colupo. Several holes successfully intersected tourmaline breccias with anomalous copper and molybdenum values. The purpose of the drilling program was to identify tourmaline breccias near to the known extents of mineralisation but concealed by the ‘caliche’ gravel cover. Mineralisation at Colupo is host within the tourmaline breccias with the first objective being to locate the breccias. All drill holes were drilled to only 20 metres deep to conserve costs and avoid unnecessarily drilling long intercepts of non-prospective volcanic rocks. It is unlikely that every breccia will host high grade mineralisation within the first few metres although it can occur (for example, high grades at Colupo Norte in hole RCCN-02). Consequently, any detection of tourmaline breccias is considered highly prospective and requires deeper drilling to test their metal content.
Assay results for the non-prospective volcanic units at Colupo are typically below 80 ppm. The best anomalous intervals detected within the prospective tourmaline breccias were in holes RCBC-017 and RCBC-018 (800 ppm Cu) (see Table 3). Estrella will further test this zone to see if it is a displaced section of the main WNW trending mineralised tourmaline breccias. It is important to note that in Table 2, similar anomalous values were detected in hole RCCN-03 at Colupo Norte to the anomalous values detected in tourmaline breccias at Colupo (approximately 800 ppm), where just 27 metres away, high grade copper grades were intersected in hole RCCN-02 within the same tourmaline breccias.
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Figure 4: Colupo drill plan layout showing follow up tourmaline breccia zones identified by the shallow RC drill hole campaign (Map Datum WGS84, zn19s).
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Table 3: Copper oxide anomalies in tourmaline breccias intersected by shallow RC drill holes at Colupo.
| **Hole ID ** | **Easting ** | **Northing ** | **RL ** | EOH | **Azimuth ** | **Dip ** | From (m) |
To (m) |
Interval | Cu ppm |
|---|---|---|---|---|---|---|---|---|---|---|
| RCBC-01 | 402,223 | 7,514,634 | 1910 | 20 | 0° | -90° | 8 | 10 | 2 | 355 |
| 10 | 12 | 2 | 425 | |||||||
| RCBC-08 | 401,884 | 7,514,539 | 1910 | 20 | 190° | -70° | 14 | 16 | 2 | 800 |
| RCBC-012 | 401,918 | 7,514,591 | 1910 | 20 | 120° | -70° | 16 | 18 | 2 | 397 |
| RCBC-017 | 401,864 | 7,514,454 | 1910 | 20 | 210° | -70° | 0 | 2 | 2 | 761 |
| 2 | 4 | 2 | 542 | |||||||
| RCBC-018 | 401,862 | 7,514,455 | 1910 | 20 | 120° | -70° | 0 | 2 | 2 | 485 |
| 2 | 4 | 2 | 789 | |||||||
| 4 | 6 | 2 | 556 | |||||||
| 10 | 12 | 2 | 432 | |||||||
| RCBC-019 | 401,974 | 7,514,606 | 1910 | 20 | 120° | -70° | 6 | 8 | 2 | 444 |
(Coordinates in PSAD56, zone19s)
The combination of identifying several more Tourmaline Breccias at Colupo and Colupo Norte highlights the potential for Estrella to extend the known mineralisation at these prospects and discover more prospects with high grade nearsurface occurrences in a similar geological setting. Continued exploration success will greatly assist Estrella’s objective of eventually extracting the ore for economic purposes.
4. Colupo progressing to Mineral Resource and Exploration Target
The next step along Estrella’s path to becoming a copper producer is progressing to a maiden JORC 2012 Mineral Resource statement for Colupo. Estrella expects to release the resource statement in late September 2014, which will include both a Mineral Resource statement and an Exploration Target.
5. Antucoya West porphyry target
In August, Estrella reviewed all geological data obtained from the recent 38 RC hole porphyry detection program (refer ASX announcement 5 August 2014) with respect to the geophysical dataset across Antucoya West and the Antucoya mine development (owned by Antofagasta Minerals PLC, LON:ANTO). Estrella’s recent exploration activity at Antucoya West has been highly successful in identifying mineralisation, increasing understanding of the geology and the relevance of all the geophysical responses, which has boosted the project’s porphyry prospectivity.
Estrella’s exploration team has concluded following the review that the highest ranked porphyry target lies 1000 metres to the northeast of hole RCAW019. Estrella believes that there is strong potential for a significant copper mineralised porphyry system beneath this zone. Based on the MT inversion depth slices (see Figure 7) copper sulphide mineralisation is expected to commence at approximately 150 metres beneath the surface, copper oxide mineralisation is expected between the surface and 150 metres.
In summary, Estrella believes in the strong potential and has selected the porphyry target zone location because of:
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The large ‘washed-out’ anomaly between two magnetic highs (La Negra Volcanics) is similar to the ‘washedout’ zone over Antucoya (not Estrella owned) (see Figure 4);
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The extensive presence of Cu-Copiapite and Jarosite oxidation located above a strong pyrite zone;
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Typically, copper sulphides such as Chalcopyrite emit chargeability responses around 25 to 35 msecs. Estrella currently believes that the chargeability responses consistent with Chalcopyrite lie immediately adjacent to the pyrite zones (see Figure 5) and
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- The Magnetotelluric ( MT ) inversion model (Figure 6) indicates that the Chalcopyrite target zone commences at about 150 metres depth.
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Figure 5: Airborne Magnetics image (ASVI) over Antucoya West overlaid with mapped geology, mineralisation related oxidation extents and copper oxide intercepts from the recent 38 RC hole detection program by Estrella in June-July 2014 (Map Datum WGS84 Zn19s).
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Figure 6: Vector IP image over Antucoya West overlaid with mapped geology, mineralisation related oxidation extents and copper oxide intercepts from the recent 38 RC hole detection program by Estrella in June-July 2014 (Map Datum WGS84 Zn19s).
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Figure 7: MT inversion model 100m depth slice over Antucoya West overlaid with mineralisation related oxidation extents and copper oxide intercepts from the recent 38 RC hole detection program by Estrella in June-July 2014 (Map Datum WGS84 Zn19s).
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6. Commentary
Commenting on the exploration progress across the Altair Project, Estrella's Managing Director, Dr. Jason Berton, said:
“Estrella has been successful at generating high quality prospects through diligent and cost effective exploration.
As an exploration company Estrella is in a unique position to potentially develop multiple near-surface high copper grade prospects of the Colupo area into a mining district as well as potentially unveil a large localised porphyry system at Antucoya West”
Competent Person’s Statement
Exploration information in this announcement is based upon work undertaken by Dr. Jason Berton, the Managing Director and a fulltime employee of Estrella Resources Limited whom is a Member of the Australasian Institute of Metallurgy and Mining (AusIMM). Dr Berton has sufficient experience that 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’ (JORC Code). Dr Berton consents to the inclusion in this presentation of the statements based on his information and context in which they appear.
About Estrella Resources
Estrella Resources Limited is an ASX listed, Chilean focused copper-gold exploration company. Estrella has a number of exploration projects in Chile. With a highly experienced board, a strong operational and management team and a sole focus on Chilean copper and gold projects, the Company is well positioned to develop its projects and add value for shareholders.
Directors and Management
Independent Non-Executive Chairman: -Robert Thomson Independent Non-Executive Director: -Julian Bavin
ESTRELLA RESOURCES LIMITED ACN 151 155 207
ASX CODE: ESR
ORDINARY FULLY PAID SHARES: 108,278,728
UNLISTED OPTIONS: 12,380,000
Managing Director -Dr. Jason Berton Company Secretary -Justin Clyne
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JORC Code, 2012 Edition – Table 1 report template
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| Sampling | | Nature and quality of sampling (eg cut | | Sample recoveries for reverse circulation were | |
| techniques | channels, random chips, or specific | systematically recorded. The sampling of RC drilling | |||
| specialised industry standard measurement | cuttings was undertaken at intervals of two meter by | ||||
| tools appropriate to the minerals under | reduction of the drill cuttings with a Jones riffle splitter | ||||
| investigation, such as down hole gamma | to provide approximately 60kg of RC cuttings per 2m | ||||
| sondes, or handheld XRF instruments, etc). | interval. Approximately 20kg of <10# coarse reject | ||||
| These examples should not be taken as | material is stored on site for reference. | ||||
| limiting the broad meaning of sampling. | | The sampling procedures included two reduction of | |||
| | Include reference to measures taken to | the drill cutting with the Jones riffle splitter for the | |||
| ensure sample representivity and the | sample to be analyzed and for the duplicate, the ticket | ||||
| appropriate calibration of any measurement | identification, the cutting box labeling and the bag | ||||
| tools or systems used. | labeling of RC samples in the field area and selection | ||||
| | Aspects of the determination of mineralisation | of field duplicates were carried out. | |||
| that are Material to the Public Report. | | The RC drilling cuttings samples were transported to | |||
| | In cases where ‘industry standard’ work has | the facilities of ALS Chemex, an international certified | |||
| been done this would be relatively simple (eg | Laboratory in Antofagasta. The cutting boxes and | ||||
| ‘reverse circulation drilling was used to obtain | pulps of all samples are stored for logging and | ||||
| 1 m samples from which 3 kg was pulverised | reference in the temporal warehouse of the company | ||||
| to produce a 30 g charge for fire assay’). In | at Maria Elena town, II Region, Chile. | ||||
| other cases more explanation may be | | Photography of cutting box were performed at the | |||
| required, such as where there is coarse gold | Maria elena Company facilities. | ||||
| that has inherent sampling problems. Unusual | |||||
| commodities or mineralisation types (eg | |||||
| submarine nodules) may warrant disclosure | |||||
| of detailed information. | |||||
| Drilling | | Drill type (eg core, reverse circulation, open- | | The RC drilling method was down-the-hole hammer | |
| techniques | hole hammer, rotary air blast, auger, Bangka, | drilling and the most frequently used hammer bit was | |||
| sonic, etc) and details (eg core diameter, | 5¾” diameter, although occasionally 5½” bits were | ||||
| triple or standard tube, depth of diamond tails, | also used. Shallow hole were drilled ranging from 20 | ||||
| face-sampling bit or other type, whether core | to 66m depth. The objective of this drilling campaign | ||||
| is oriented and if so, by what method, etc). | was to investigate and intersect targets zone below | ||||
| the caliche cover, defined by surface geological | |||||
| mapping, surface rock chip anomalies and XRF | |||||
| surface anomalies zones in conjunction with structural | |||||
| potentially mineralized corridor and chargeability and | |||||
| resistivity VIP survey results. | |||||
| Drill sample | | Method of recording and assessing core and | | Standard splitting and sampling protocols were | |
| recovery | chip sample recoveries and results assessed. | implemented.. RC cuttings are reduced by riffle | |||
| | Measures taken to maximise sample recovery | splitting in the field to 25% of the original drilled | |||
| and ensure representative nature of the | interval. Sample protocols included sample duplicates | ||||
| samples. | for RC (25% of total) at ~5% of total samples | ||||
| | Whether a relationship exists between | | RC samples weight data capture for recovery has | ||
| sample recovery and grade and whether | been systematically implemented at the drilling site. | ||||
| sample bias may have occurred due to | |||||
| preferential loss/gain of fine/coarse material. | |||||
| Logging | | Whether core and chip samples have been | | All RC cuttings are logged on site immediately after | |
| geologically and geotechnical logged to a | drilling, and geologists carried out a Quick Logging | ||||
| level of detail to support appropriate Mineral | 1:1000 scale for preliminary geological interpretation. | ||||
| Resource estimation, mining studies and | The Quick Log captures lithology contrast, general | ||||
| metallurgical studies. | alteration type and relevant ore mineralization. Paper | ||||
| | Whether logging is qualitative or quantitative | RC Quick logs are filed on site and data is input into | |||
| in nature. Core (or costean, channel, etc) | the pdf database. | ||||
| _photography. _ | | The entire drill hole cuttings are detailed logged at |
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| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| | The total length and percentage of the | 1:100 scale. The logging scheme and logging sheet | |||
| relevant intersections logged. | reflects the local geology in data capture. Standard | ||||
| logging and coding sheets were created for this work, | |||||
| a single person imposed consistency on the logging | |||||
| and coding processes. The holes mapped have | |||||
| complete data records that include lithology, alteration | |||||
| associations, degree and texture, mineralization type | |||||
| and minerals, intensity, relative abundance in |
|||||
| percentage, texture and occurrence type and |
|||||
| interpreted faulting. | |||||
| | The mapping system, is undertaken on paper logging | ||||
| forms and data capture has been migrated to digital | |||||
| capture on the Excel database Once all analysis of | |||||
| RC sample at 2m support is completed mineralization | |||||
| coding will be locally revised to include the | |||||
| mineralogy as continual infill drilling progresses. | |||||
| Sub-sampling | | If core, whether cut or sawn and whether | | Samples from the current program are prepared and | |
| techniques and | quarter, half or all core taken. | analyzed at ALS Chemex Laboratories (ALS) in | |||
| sample | | If non-core, whether riffled, tube sampled, | Antofagasta, II Region, Chile. The ALS laboratory | ||
| preparation | rotary split, etc and whether sampled wet or | holds ISO 9001:2008 and ISO 17025 certification and | |||
| dry. | is independent of the company and its subsidiaries. | ||||
| | For all sample types, the nature, quality and | Samples were typically dried, crushed to 70% passing | |||
| appropriateness of the sample preparation | -2 mm, and pulverized to 85% passing -0.075 mm. | ||||
| technique. | Pulverized samples were assayed for 33 elements by | ||||
| |
Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples. Measures taken to ensure that the sampling |
atomic emission spectroscopy/inductively-coupled plasma (ICP-AES) using the ALS ME-ICP61 method which comprises near-total, four acid digestion, followed by HCl dilution and ICP-AES determination. |
|||
| 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. | |||||
| Quality of | | The nature, quality and appropriateness of | | Mechanical Sample preparation was undertaken by | |
| assay data and | the assaying and laboratory procedures used | ALS Chemex in a sample preparation facility installed | |||
| laboratory tests | and whether the technique is considered | in Antofagasta. Preparation procedures followed the | |||
| partial or total. | following mechanical preparation steps: Drying at | ||||
| | For geophysical tools, spectrometers, | 105°C; Primary crushing in a “Rhino” jaw crusher to | |||
| handheld XRF instruments, etc, the | 70% passing <10# Tyler; Homogenization and | ||||
| parameters used in determining the analysis | reduction by Jones Riffle Splitter Pulverizing to 85% | ||||
| including instrument make and model, | passing <150# Tyler; Splitting to 2 sample pulp bags | ||||
| reading times, calibrations factors applied and | of approx. 500 g each. | ||||
| their derivation, etc. | | One certified standard reference material were | |||
| | Nature of quality control procedures adopted | inserted each 20 samples in the sample pulps stream | |||
| (eg standards, blanks, duplicates, external | during the Company drilling campaign at ALS | ||||
| laboratory checks) and whether acceptable | Chemex facilities in Antofagasta. New bar codes | ||||
| levels of accuracy (ie lack of bias) and | sequence for pulps stream were generated and | ||||
| precision have been established. | registered in the excel database and printed. | ||||
| Correlations between cutting samples and new bar | |||||
| codes were registered at the excel database and | |||||
| printed. A complete set of original pulps with bar | |||||
| codes is storage at ALS facilities. One certified | |||||
| GEOSTATS standard were used for Copper | |||||
| reference. Low grade copper standard (code Std Cu | |||||
| GbM301-4) nominal value: 0,165% CuT. Blanc | |||||
| material consist of quartz was inserted each 40 | |||||
| meters at ALS facilities for approximately the 2,5% of | |||||
| the sampled material in the drilling campaign. ALS | |||||
| customarily inserts pulp duplicates, blanks and | |||||
| reference materials in the assay batches. | |||||
| | The laboratory is clean and well run, with a full-time | ||||
| chemist supervising operations. Based on a shift |
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| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| seven days per week. | |||||
| Verification of | | The verification of significant intersections by | | Assay data are supplied electronically by ALS, and | |
| sampling and | either independent or alternative company | uploaded into the spread sheet. Additionally ALS | |||
| assaying | personnel. | provides an access controlled server data base were | |||
| | The use of twinned holes. | the results could be revised and/or downloaded. | |||
| | Documentation of primary data, data entry | ||||
| procedures, data verification, data storage | |||||
| (physical and electronic) protocols. | |||||
| | Discuss any adjustment to assay data. | ||||
| Location of | | Accuracy and quality of surveys used to | | The local coordinate system employed for collar | |
| data points | locate drill holes (collar and down-hole | location is PSAD56 19S in UTM projections. The | |||
| surveys), trenches, mine workings and other | collar locations of all holes are surveyed using | ||||
| locations used in Mineral Resource | standard GPS method. | ||||
| estimation. | |||||
| | Specification of the grid system used. | ||||
| | Quality and adequacy of topographic control. | ||||
| Data spacing | | Data spacing for reporting of Exploration | | Drill hole collars were at irregular intervals, at | |
| and distribution | Results. | approximately 50m spaces. No attempt should be | |||
| | Whether the data spacing and distribution is | made to establish geological continuity at Colupo | |||
| sufficient to establish the degree of geological | Norte at this early stage of exploration. Additionally it | ||||
| and grade continuity appropriate for the | is too early to infer that the tourmaline breccias | ||||
| Mineral Resource and Ore Reserve | identified at Colupo will progress to Miineral Resource | ||||
| estimation procedure(s) and classifications | category without further drill testing. | ||||
| applied. | | 2 metre sample intervals were used at Colupo and 1 | |||
| | Whether sample compositing has been | metre sample intervals were used at Colupo Norte. | |||
| applied. | |||||
| Orientation of | | Whether the orientation of sampling achieves | | Distrital scale structures are a key factor in the | |
| data in relation | unbiased sampling of possible structures and | localization of potential and observed mineralization in | |||
| to geological | the extent to which this is known, considering | the project area. Faults are highly significant aspects | |||
| structure | the deposit type. | of the project geology. | |||
| | If the relationship between the drilling | | The property is located along the Buey Muerto Fault | ||
| orientation and the orientation of key | Zone a north-northwest trending fault splay which | ||||
| mineralized structures is considered to have | control the location of Antucoya Porphyry deposit, as | ||||
| introduced a sampling bias, this should be | a part of a 3 to 15km wide zone of inter-related faults | ||||
| assessed and reported if material. | of the major regional, north-south trending, sinistral | ||||
| strike-slip Atacama Fault Zone, which was active | |||||
| during the Early Cretaceous, that extends for much of | |||||
| the length of the Coastal Cordillera. The Buey Muerto | |||||
| Fault Zone exhibit a 40 km length trace and contribute | |||||
| to lithological contact between the Upper Jurassic | |||||
| plutonic batholith to the west with the upper Jurassic- | |||||
| Cretacic volcanic sequences to the east. The syn- | |||||
| mineralization structures are likely to have controlled, | |||||
| the localization of intense fracturing and emplacement | |||||
| of hydrothermal alteration. The interpreted local | |||||
| structures in Colupo and Colupo Norte are significant | |||||
| in control of the limonite-altered outcrops | |||||
| emplacement and in hosting oxide copper | |||||
| mineralization occurrences showing a degree of | |||||
| continuity in the north north west-south south east | |||||
| direction. | |||||
| | The RC drilling campaign included 21 holes (inclined | ||||
| and vertical) to 20m depth at Colupo and 4 holes | |||||
| inclined at Colupo Norte. | |||||
| Sample | | The measures taken to ensure sample | | Samples were transported by ALS using transport | |
| security | security. | services trucks | |||
| and personnel, and were securely locked at the ALS | |||||
| Labs. Chain-of-custody procedures consisted of filling |
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| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| out sample submittal forms that accompanied the | |||||
| sample shipments to confirm that all samples were | |||||
| received by the laboratory. Sample security consisted | |||||
| of locking samples, once collected, in the field camp | |||||
| compound prior to delivery to ALS. This level of | |||||
| security is considered industry standard for early- | |||||
| stage exploration programs. | |||||
| | Sample rejects and Pulps are currently stored at ALS | ||||
| in a secure environment. Company sampling data are | |||||
| stored in an Excel spread sheet. | |||||
| Audits or | | The results of any audits or reviews of | | Assay results were found to remain well beneath 5% | |
| reviews | sampling techniques and data. | deviation from reported lab results when compared | |||
| with duplicate samples. |
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| Mineral | | Type, reference name/number, location and | | The Altair project under Option Agreement with SQM | |
| tenement and land tenure status |
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. |
| and is comprised of 444 tenements known as ‘Pertenencia’s’ which are registered with and maintained by SQM and with no encumbrances. Estrella holds 100% ‘metals’ rights with SQM maintaining 49% ‘clawback’ upon completion of a |
||
| | The security of the tenure held at the time of | prefeasibility study. Royalty commitments have been | |||
| reporting along with any known impediments | previously published in ASX announcements. | ||||
| to obtaining a licence to operate in the area. | |||||
| | There are no native title interests, historical sites, | ||||
| national parks, wilderness or environmental settings | |||||
| to Estrella’s knowledge. | |||||
| Exploration | | Acknowledgment and appraisal of exploration | |
SQM drilled 15 RC holes at Colupo in 2010-2011, the | |
| done by other parties |
by other parties. | results of this have been released to the ASX by Estrella on multiple occasions See ASX |
|||
| announcements; 18 March 2013, 11 Nov 2013, 3 | |||||
| Dec 2013, 18 March 2014. | |||||
| Geology | | Deposit type, geological setting and style of | | Mineralization of the project and other deposits in the | |
| mineralisation. | region are part of the Stratabound family of deposits. | ||||
| Porphyry Cu (Mo), Copper bearing veins and IOCG | |||||
| type deposit could be found in the District. Strata- | |||||
| bound Cu- (Ag) deposits, long known as ‘Chilean | |||||
| manto-type’, occur along the Coastal Cordillera of | |||||
| northern Chile (22º-30ºS) hosted by Jurassic and | |||||
| Lower Cretaceous volcanic. The mineralisation took | |||||
| place at the time of structurally controlled | |||||
| emplacement of batholiths within the Mesozoic | |||||
| volcanic and sedimentary strata. The volcanic-hosted | |||||
| strata-bound Cu- (Ag) deposits invariably occur distal, | |||||
| but peripheral to coeval batholiths emplaced within | |||||
| tilted Mesozoic strata. The prevalent view that these | |||||
| deposits have an inherent genetic relationship with | |||||
| hydrothermal fluid derivation from sub volcanic stocks | |||||
| and dykes is contended here. The strata-bound Cu- | |||||
| (Ag) mineralisation appears to be produced by fluids | |||||
| of mixed origin that were mobilized within permeable | |||||
| levels and structural weakness zones of the Mesozoic | |||||
| arc-related volcano-sedimentary sequence during the | |||||
| emplacement of shallow granodioritic batholiths under | |||||
| transtensional regimes. | |||||
| | Theproject exhibits alteration- limonitic outcrops and |
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| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| copper old mining works are present in the area. | |||||
| Structures are mostly NS and EW trending faulting | |||||
| and fracturing zones from 300 to 400m long. Copper | |||||
| high grades ores concentrate in rich sub-vertical | |||||
| zones, pockets and tourmaline quartz breccias zones | |||||
| along and between these structures zones, separated | |||||
| by low-grade sections of other tourmaline breccias | |||||
| and dacitic host rocks. | |||||
| | Silicification, propylitic alteration and chloritization | ||||
| occur within and around these copper bearing | |||||
| breccias and pockets which exhibits local quartz- | |||||
| sericitic alteration, and extend some metres into the | |||||
| wall rocks. The supergene paragenetic sequence of | |||||
| the largest breccia is magnetite-quartz-tourmaline- | |||||
| pyrite-(chalcopyrite)–hematite-calcite and (chalcocite) | |||||
| atacamite and chrysocolla. | |||||
| The supergene copper minerals fill fractures and | |||||
| openings, either as irregular and discontinuous veinlets or | |||||
| semi-massive pockets with cummular and brecciated | |||||
| textures, or as fine dissemination. The structure of the | |||||
| Cu-bearing breccias is regular and continuous within | |||||
| _structural zones. _ | |||||
| Drill hole | | A summary of all information material to the | | A summary for all Material holes of this | |
| Information | understanding of the exploration results | announcement is provided in the results tables: | |||
| including a tabulation of the following | Tables 1, 2 & 3. | ||||
| information for all Material drill holes: | |||||
o easting and northing of the drill hole collar |
|||||
o elevation or RL (Reduced Level – |
|||||
| elevation above sea level in meters) of the | |||||
| drill hole collar | |||||
o dip and azimuth of the hole |
|||||
o down hole length and interception depth |
|||||
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. | |||||
| Data | | In reporting Exploration Results, weighting | | No use of weighted averaging, no maximum grade | |
| aggregation | averaging techniques, maximum and/or | cut, the minimum grade cut is 0.2% Cu for Table 1, | |||
| methods | minimum grade truncations (eg cutting of high | and no metal equivalent reporting was performed. | |||
| 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. | |||||
| Relationship | | These relationships are particularly important | | There is insufficient information at this stage to | |
| between | in the reporting of Exploration Results. | determine true width. | |||
| mineralisation | | If the geometry of the mineralisation with | |||
| widths and | respect to the drill hole angle is known, its | ||||
| intercept | nature should be reported. | ||||
| lengths | | 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’). _ | |||||
| Diagrams | | Appropriate maps and sections (with scales) | | Provided in this announcement. | |
| and tabulations of intercepts should be |
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| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|---|
| 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. | |||||
| Balanced | | Where comprehensive reporting of all | | All material results have been reported, including | |
| reporting | Exploration Results is not practicable, | high, medium and low grades. | |||
| representative reporting of both low and high | |||||
| grades and/or widths should be practiced to | |||||
| avoid misleading reporting of Exploration | |||||
| Results. | |||||
| Other | | Other exploration data, if meaningful and | | Section 5 of this announcement refers to substantive | |
| substantive | material, should be reported including (but not | geophysical data. | |||
| exploration | limited to): geological observations; | ||||
| data | 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 | | Further work programs have been discussed in this | |
| (eg tests for lateral extensions or depth | announcement, including Mineral Resource and | ||||
| extensions or large-scale step-out drilling). | Exploration Target schedule for Colupo and follow up | ||||
| | Diagrams clearly highlighting the areas of | drilling areas for each project. | |||
| possible extensions, including the main | |||||
| geological interpretations and future drilling | |||||
| areas, provided this information is not | |||||
| commercially sensitive. |
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