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ASX:ESR | |||
27 Ja uary 2022 | Potential of New Zone Extends T5 | ||
use | HIGHLIGHTS | ||
Downhole Electromagnetic (DHEM) platform hole CBDD062 extends potential of new zone below T5 | |||
nickel-copper deposit | |||
∙ DHEM modelling indicates the mineralisation is still open to the north and south | |||
∙ New EM plate situated between previous drilling | |||
Planning underway to for next round of drilling at T5 between regional exploration programs | |||
personal | ∙ Drilling with a combination of wedge holes and DHEM is being planned | ||
For | |||
Figure 1: Emerging new mineralised zone below T5 highlighted by recent DHEM from holes CBDD060 and CBDD062 | |||
Estrella Resources Limited (ASX: ESR) (Estrella or the Company) is pleased to announce positive results from the DHEM surveying at the T5 nickel-copper deposit at the Company's 100% owned Carr Boyd Nickel Project, located approximately 80km from Kalgoorlie, WA. DHTEM surveying of drillholes CBDD060 and CBDD062 has assisted in defining a potential new zone of mineralisation below the T5 discovery, intersected in holes CBDD057 and CBDD042A (see ASX announcements 24 November 2021 and 9 April 2021 respectively).
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Office Address London House, Level 11, 216 St Georges Terrace, PERTH WA 6000 Postal Address GPO Box 2517, PERTH WA 6831 Phone +61 8 9481 0389 Fax +61 8 9463 6103 Email info@estrellaresources.com.au
For personal use only
The DHEM result confirms the continuation of mineralisation potential to the north which escaped detection when holes CBDD044 and CBDD047 were electromagnetically surveyed. The currently modelled DHEM plates extend over a strike length of 165m, and it is a further 50m to the massive sulphide breccia intersection in CBDD042A to the south. Work is underway to schedule several more step-out holes to the north and south of T5 to locate the continuation of mineralisation both up and down plunge.
The next northern step-out drilling will explore a potential fault off-set that has dislocated the massive sulphides resulting in a DHEM response skewed towards the main T5 mineralisation, leaving additional areas blind to electromagnetics. Drilling will also test the new plates generated by CBDD060 and CBDD062.
The southern drilling will target the continuation of the T5 massive sulphide mineralisation towards the Proterozoic Dyke (Figure 1) as well as infill the last drilled section of T5 mineralisation above and below CBDD042A as shown in Figure 2.
Figure 2: Zoomed longsection of the T5 Mineralised Envelope showing geophysical responses only from CBDD060 and CBDD062 in relation to intersected nickel-copper sulphides in the southern plunge area
Figure 3: Basal breccia style globular to massive mineralisation observed in CBDD057 grading 3.7% nickel. This style of mineralisation noes not always yield a strong DHEM geophysical response.
For personal use only
Estrella Managing Director Chris Daws commented:
"T5 continues to provide an exciting opportunity for Estrella to extend the footprint of the high grade nickel sulphides we have intersected in recent drilling at depth. The refinement in how we utilise DHEM surveys to guide us is evolving and we are gaining an understanding of the capabilities and limitations in identifying the mineralisation.
The latest round of surveys at depth unequivocally informs us that the limit of the T5 mineralisation is yet to be found.
I look forward to updating our shareholders as we progress with our findings and as we continue to explore this world-class opportunity."
Regional Exploration
The Phase 5 regional program is in full swing and the Company will update the market on progress in coming days.
The Board has authorised for this announcement to be released to the ASX.
FURTHER INFORMATION CONTACT
Christopher J. Daws
Managing Director Estrella Resources Limited +61 8 9481 0389
info@estrellaresources.com.au
Media:
David Tasker
Managing Director
Chapter One Advisors
- dtasker@chapteroneadvisors.com.au
- +61 433 112 936
Competent Person Statement
The information in this announcement relating to Exploration Results is based on information compiled by Steve Warriner, who is the Exploration Manager of Estrella Resources, and a member of The Australasian Institute of Geoscientists. Mr. Warriner has sufficient experience relevant to the style of mineralisation and type of deposit under consideration, and to the activity 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 Resource and Ore Reserves". Mr. Warriner consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.
Table 2: Drill hole collar details
Hole ID | Final Depth | Easting | Northing | RL | Dip | Azimuth | Status |
CBDD042A | 654.7 | 367404 | 6673500 | 430.2 | -70 | 270 | Completed |
CBDD057 | 606.7 | 367370 | 6673580 | 431.8 | -70 | 260 | Completed |
CBDD060 | 741.6 | 367372 | 6673580 | 431.9 | -75 | 260 | Completed |
CBDD062 | 672.9 | 367414 | 6673750 | 433.6 | -72 | 270 | Completed |
APPENDIX 1 JORC TABLE 1 - JORC CODE, 2012 EDITION - TABLE 1
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
Criteria | JORC Code explanation | Commentary | |||||||
Sampling | ∙ Nature and quality of sampling (e.g. cut | ∙ | DD core samples have been half cut with an automatic | ||||||
techniques | channels, | random chips, | or specific | core saw. | |||||
only | specialised | industry | standard | ∙ 0.25m-1.1m samples are collected from the core trays as | |||||
measurement tools appropriate to the | marked out by the supervising geologist. | ||||||||
minerals under investigation, such as | ∙ A handheld XRF tool was used to verify the mineralisation | ||||||||
down hole gamma sondes or handheld | with samples reporting >0.3% Ni in disseminated zones | ||||||||
XRF instruments, etc.). These | and >1% Ni in the matrix sulphide zones. | ||||||||
examples should not be taken as | ∙ | XRF results have not been reported and are used as a | |||||||
limiting the broad meaning of sampling. | logging/sampling verification tool only. |
- Include reference to measures taken to ∙ Core is cut and sampled to ensure the sample is
use | ensure sample representivity and | the | representative and no bias is introduced. Cutting of | |||||||
appropriate | calibration | of | any | specific, banded or stringer sulphide zoned core is done | ||||||
measurement tools or systems used. | orthogonal to the banding to ensure there is no bias. | |||||||||
∙ Aspects | of | the | determination | of | ∙ | Determination of mineralisation has been based on | ||||
mineralisation that are material to the | geological logging, visual sulphide estimates and | |||||||||
Public Report. | confirmation using a pXRF machine. Samples were | |||||||||
dispatched to an accredited laboratory for multi-element | ||||||||||
analysis. | ||||||||||
. | ||||||||||
personal | ∙ In cases where 'industry standard' work | ∙ Diamond core drilling was used to obtain 3m length | ||||||||
has been done this would be relatively | samples from the core barrel which are then marked in | |||||||||
simple (e.g. 'reverse circulation drilling | one meter intervals, based on core block measurements. | |||||||||
was used to obtain 1 m samples from | ∙ Samples are selected based on geological logging | |||||||||
which 3 kg was pulverised to produce a | boundaries or on nominal meter marks. | |||||||||
30g charge for fire assay'). In other | ∙ Collected samples weigh a nominal 2-3 kg (depending on | |||||||||
cases more explanation may be | sample length). | |||||||||
required, such as where there is coarse | ∙ Samples have been dispatched to an accredited | |||||||||
gold that has inherent sampling | commercial laboratory in Perth for analysis. | |||||||||
problems. | Unusual | commodities | or | ∙ | Samples are being analysed using a 4-acid digest, ME- | |||||
mineralisation | types | (e.g. submarine | ICP for 33 elements and ore zone samples are also being | |||||||
nodules) | may | warrant disclosure of | tested for Au & PGE elements using ICP analysis. | |||||||
detailed information | ||||||||||
Drilling | ∙ | Drill type (e.g. core, reverse circulation, | ∙ Drilling was undertaken using NQ2 sized drill core. | |||||||
t chniques | open-hole hammer, rotary air blast, | ∙ Holes have been collared with mud rotary from surface, | ||||||||
auger, Bangka, sonic, etc) and details | HQ rough cored to top of fresh rock then NQ2 cored to | |||||||||
(e.g. core diameter, triple or standard | EOH. | |||||||||
tube, depth of diamond tails, face- | ||||||||||
For | sampling bit or other type, whether core | |||||||||
is oriented and if so, by what method, | ||||||||||
etc). | ||||||||||
Drill sample | ∙ | Method of recording and assessing | ∙ Core recovery was recorded by the field crew and verified | |||||||
recovery | core and chip sample recoveries and | by the geologist. | ||||||||
∙ | results assessed. | ∙ | RQD measurements were digitally recorded to ensure | |||||||
Measures taken to maximise sample | recovery details were captured. | |||||||||
recovery | and | ensure representative | ∙ | Sample recovery in all mineralised zones is high with | ||||||
nature of the samples. | negligible core loss observed. | |||||||||
∙ Whether a relationship exists between | ∙ | Diamond core drilling is the highest standard and no | ||||||||
sample recovery and grade and | relationship has been established between sample | |||||||||
whether sample bias may have | recovery and reported grade as the core is in very good | |||||||||
occurred due to preferential loss/gain of | condition. | |||||||||
fine/coarse material. |
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Criteria | JORC Code explanation | Commentary | ||||||||||||||||||
Logging | ∙ | Whether core and chip samples have | ∙ Detailed industry standard of collecting core in core trays, | |||||||||||||||||
been | geologically | and geotechnically | marking meter intervals & drawing core orientation lines | |||||||||||||||||
logged to a level of detail to support | was undertaken. | |||||||||||||||||||
only | appropriate | Mineral | Resource | ∙ | Core trays | were photographed wet and dry prior to | ||||||||||||||
estimation, mining | studies | and | sampling. | |||||||||||||||||
metallurgical studies. | ∙ Drill hole logs are recorded in Excel spread sheets and | |||||||||||||||||||
∙ Whether | logging | is | qualitative | or | validated in Micromine Software as the drilling | |||||||||||||||
quantitative in nature. Core (or costean, | progresses. | |||||||||||||||||||
channel, etc) photography. | ∙ The entire length of all holes is logged. | |||||||||||||||||||
∙ The total length and percentage of the | ||||||||||||||||||||
relevant intersections logged. | ||||||||||||||||||||
Sub- | ∙ | If core, whether cut or sawn and | ∙ Core is half cut using an automatic core saw to achieve a | |||||||||||||||||
sampling | whether quarter, half or all core taken. | half-core sample for laboratory submission. | ||||||||||||||||||
techniques | ∙ | If non-core, whether riffled, tube | ∙ The sample preparation technique is considered industry | |||||||||||||||||
and sample | sampled, rotary split, etc and whether | best standard practice. | ||||||||||||||||||
use | ||||||||||||||||||||
pr paration | sampled wet or dry. | ∙ No field duplicates have been collected in this program. | ||||||||||||||||||
∙ For all sample types, the nature, quality | Field duplicates will be collected once initial results are | |||||||||||||||||||
and appropriateness of the sample | returned and resampling of the mineralised zones is | |||||||||||||||||||
preparation technique. | warranted. | |||||||||||||||||||
∙ Quality control procedures adopted for | ∙ | Sample sizes are appropriate to the grain size of the | ||||||||||||||||||
all sub-sampling stages to maximise | mineralisation. | |||||||||||||||||||
representivity of samples. | ||||||||||||||||||||
personal | ∙ | Measures taken to ensure that the | ||||||||||||||||||
sampling is representative of the in-situ | ||||||||||||||||||||
material | collected, | including | for | |||||||||||||||||
instance | results | for | field | |||||||||||||||||
duplicate/second-half sampling. | ||||||||||||||||||||
∙ Whether sample sizes are appropriate | ||||||||||||||||||||
to the grain size of the material being | ||||||||||||||||||||
sampled. | ||||||||||||||||||||
Quality of | ∙ | For geophysical tools, spectrometers, | ∙ No handheld XRF results are reported however the tool | |||||||||||||||||
assay data | handheld XRF instruments, etc, the | was used to verify the mineralisation with reporting >0.3% | ||||||||||||||||||
and | parameters used in determining the | Ni in disseminated zones and >1% Ni in the matrix | ||||||||||||||||||
laboratory | analysis including instrument make and | sulphide zones. | ||||||||||||||||||
te ts | model, | reading | times, | calibrations | ∙ DHTEM parameters are as follows; | |||||||||||||||
∙ | factors applied and their derivation, etc. | ∙ | Tx Loop size: | 500 x 800 m | ||||||||||||||||
Nature of quality control procedures | ∙ | Transmitter: | GAP HPTX-70 | |||||||||||||||||
adopted | (e.g. | standards, blanks, | ∙ | Receiver: | EMIT SMARTem24 | |||||||||||||||
duplicates, external laboratory checks) | ∙ | Sensor: | EMIT DigiAtlantis | |||||||||||||||||
and whether acceptable levels of | ∙ | Station spacing: | 2m to 10m | |||||||||||||||||
accuracy | (i.e. | lack | of | bias) | and | ∙ | Tx Freq: | 0.5 Hz | ||||||||||||
precision have been established. | ||||||||||||||||||||
∙ | Duty cycle: | 50% | ||||||||||||||||||
∙ | Current: | ~130 Amp | ||||||||||||||||||
∙ | Stacks: | 32-64 | ||||||||||||||||||
∙ | Readings: | 2-3 repeatable readings per | ||||||||||||||||||
station | ||||||||||||||||||||
Verification | ∙ | The | verification | of | significant | ∙ Results verified internally by Company personnel | ||||||||||||||
of sampling | intersections by either independent or | |||||||||||||||||||
and | alternative company personnel. | |||||||||||||||||||
Forassaying | ||||||||||||||||||||
∙ | The use of twinned holes. | ∙ | Hole CBDD0028 is twinning hole CBP042. No other | |||||||||||||||||
twinning is warranted at this stage. | ||||||||||||||||||||
∙ | Documentation of primary data, data | ∙ The data was collected and logged using Excel | ||||||||||||||||||
entry procedures, data verification, data | spreadsheets and validated using Micromine Software. | |||||||||||||||||||
storage | (physical | and | electronic) | The data will be loaded into an externally hosted and | ||||||||||||||||
protocols. | managed database. | |||||||||||||||||||
∙ Discuss any adjustment to assay data. | ∙ No adjustments have been made to the assay data other | |||||||||||||||||||
than length weighted averaging. | ||||||||||||||||||||
Location of | ∙ | Accuracy and quality of surveys used to | ∙ The holes were pegged using a hand-held GPS +3m | |||||||||||||||||
data points | locate drill holes (collar and down-hole | ∙ The rig was setup over the nominated hole position and | ||||||||||||||||||
surveys), trenches, mine workings and | final GPS pickup occurred at the completion of the hole. |
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Estrella Resources Limited published this content on 26 January 2022 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 27 January 2022 00:08:07 UTC.