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ESTRELLA RESOURCES LIMITED — Capital/Financing Update 2021
Apr 8, 2021
64878_rns_2021-04-08_4d016ebd-9c2f-4fd4-869d-589152a79c62.pdf
Capital/Financing Update
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9 April 2021
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ASX ANNOUNCEMENT
Carr Boyd Exploration Update
HIGHLIGHTS
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Seismic survey over the T5 to Drinkwater basal contact recently completed by Ultramag. Data processing and interpretation is underway. Project will qualify for R&D rebate (Figure 1 & 2).
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Two diamond core holes completed to collect rock properties (density & velocity readings) to augment the seismic modelling process and to confirm position of the basal contact (Figure 2).
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Mapping of the Carr Boyd Intrusive Complex 50% complete, several new prospects identified with nickel gossan float material located at surface (Figure 3).
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Phase 2 diamond drilling at T5 Prospect completed, Phase 3 infill and step-out holes underway.
oCBDD042A intersected 4.9m @ 0.96% Ni, 0.35% Cu in feeder zone, net-textured sulphides -
Additional Downhole Electromagnetic surveys utilising a very low resistance loop highlighted additional potential sulphide anomalism which will be tested in the next few weeks (Figure 4).
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Combination Reverse Circulation / Diamond Drill Rig has arrived on site (Figure 5) to boost regional exploration along 30km of untested basal contact.
Estrella Resources Limited (ASX: ESR) (Estrella or the Company) is pleased to update the market with its progress at the Carr Boyd Nickel Project in the Eastern Goldfields, Western Australia.
R&D Hard-Rock Seismic Survey by Ultramag and 3D Geological Interpretation
The Seismic Program comissioned by Estrella Resources utilised a new type of impact vibrator called an e-Vibe (shown in Figure 1) which is operated by Ultramag. This is the first time this system combined with new seismic nodes from Schlumberger has been deployed in a hard-rock, Archean nickel environment. This compact seismic source was successfull in allowing the Company to access areas previously inaccessible to conventional seismic machinery due to their cost, size and environmental impact.
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Figure 1: R&D Seismic Survey conducted by Ultramag enabled very low environmental impact seismic surveying at Carr Boyd, allowing the company to image the prospective basal contact at depth ahead of drill planning. The e-Vibe system enabled access into areas where traditional seismic systems were too large and destructive to operate effectively.
Ultramag have recently completed a 20 linear kilometre seismic acquisition process (Figure 2) and initial data available to the Company shows the experimental system has successfully performed to the
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 [email protected]
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specifications of the experiment. A further 8-10 weeks of data processing will take place before the Company will have a full 3D interpretation of T5 and the embayment area. The Company will update the market with the modelled results when available.
The Carr Boyd basal contact is the most prospective horizon within the Intrusive Complex. Historically it been difficult to intersect in drilling due to its variable dip and in places, faulted nature. The use of seismic will vastly improve the success rate of any targeted drilling at depth.
The company has comissioned Graeme Hird from Rock Solid Seismic to assist with the interpretation. Mr Hird is Australia’s most experienced hard-rock seismic interpreter. The seismic survey is a necessary derisking tool employed by the company that will increase the success rate of deeper drilling targeting the basal contact for nickel sulphides. Interpretation will utilise all new and historical, geological and geophysical datasets available to the company.
Drilling Conducted for the Seismic Program
Diamond drill holes CBDD045 and CBDD046 were completed to gather geophysical rock properties (density and velocity) as well as geological information to assist in the seismic modelling and interpretation of the basal contact. The holes were drilled just south and west of the Carr Boyd Mine (Figure 2) and this information will be incorporated into the seismic data processing and interpretation as a part of the R&D project.
The holes were planned to intersect the basal contact in the vacinity of seismic lines and were not targeting sulphides directly (Figure 2). The holes intersected chilled pyroxenitic rubble breccias clearly associated with the basal contact and DHEM will be completed on the holes to complete the geophysical anyalysis of the contact zone.
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Figure 2: Locations of CBDD045 and CBDD046 with respect to the Seismic lines and T5 Mineralised Contact
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Regional Potential
Mapping of the Carr Boyd Intrusive Complex to assist in the 3D structural and geological modelling and interpretation work has led the Company to an updated interpretation of the local geology with respect to nickel potential. Regional stratigraphy and geological context has now been established. Geological vectors known to be important for nickel accumulation are pointing south along the T5 Feeder Zone to an interpreted embayment at the base of the Intrusive Complex where pyroxenite intrusions have been mapped crosscutting and assimilating sulphidic sediments. The resulting sulphides, once exposed and assimilated by the pyroxenites, become progressively enriched in nickel and settle onto the base of the embayment. Nickel gossan float material can be found at surface which represent this mineralised material on the basal contact (Figure 3).
The company believes that the T5 nickel mineralisation and the Carr Boyd Mine mineralisation may have a common source at depth within the embayment. Additional work on structural offsets within the complex should allow Estrella’s geological team to begin to pinpoint these locations, and together with the updated 3D interpretation, to drill test them. A detailed drone DTM and aerial photography survey has been completed along the length of the contact zone (Figure 3) to assist with the targeted exploration program.
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Figure 3: Mapped basal contact in relation to sulphidic sediments, assimilation zones where sulphides enter the intrusion and nickel sulphides at surface (NiS). Mapping reveals that the paleo-gravity direction is to the west (left) with younging to the east, confirming the mapped embayment as a significant geological feature.
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T5 Drilling and Downhole Electromagnetics (DHEM)
The Company has completed Phase 2 drilling at the T5 discovery area. To date, 15 holes have been completed at the T5 Prospect for just over 7,659m. Significant intercepts are presented in Table 1 and in Figures 4 and 6. Drilling has revealed the T5 Prospect to be a feeder zone along which sulphides have travelled. Due to the deep nature of drilling at T5, de-risking work will be undertaken to enhance drill success offuture drilling. This de-risking will be based on seismic interpretation, further structural work and advanced downhole electromagnetics.
DHEM results recently received by the Company show the T5 Conductor continuing to increase with depth (Figure 4). In particular, DHEM and drill results confirm a steep south plunge to the sulphides at this location.
The next round of infill and step-out drilling has commenced and will test the T5 contact to the north and south of known mineralisation in order to expand this zone laterally. Deeper drilling will be planned once results of the Seismic Survey have been fully interpreted and small-scale faulting of the contact has been taken into account.
Estrella Managing Director Chris Daws commented:
“The experimental seismic program was completed successfully and the initial results are promising, which should allow our geologists to see the basal contact at depth for the very first time. The combination of technology and geological science coming togther at Carr Boyd is extremely exciting and eye opening. Combined with the regional mapping works and the drill rig which continues to uncover mineralisation at our flagship Carr Boyd Nickel & Copper Project, we are contining to work at full stride so that we can unlock the source of the nickel and copper sulphides discovered to date at the project. I look forward to the next round of drilling results and the seismic-geoligical interpretations.”
Combination Reverse Circulation / Diamond Drill Rig has arrived on site
Topdrive Drillers have supplied Estrella Resources a track-mounted Combination Diamond / Reverse Circulation Drill Rig (RC/DD) capable of up to 400m RC and 1,800m NQ2 diamond holes. This rig (Figure 5) will enable the Company to drill relatively cheap pre-collars ahead of diamond tails which will reduce the overall costs on deeper drilling. The RC/DD rig will also enable a cost-effective expansion of the regional exploration effort into the interpreted embayment in Figure 3.
Proposal of Works approvals have been received for the company to progress exploration north, south and east along the basal contact covering Dunn, Drinkwater, Schmidt, Sir William Wallace, Tregurtha and Gossan Hill Prospects (Figure 2) as well as other prospects further afield along the basal contact. The company intends to use the RC capability of the rig to test and refine the Seismic Interpretation of the basal contact ahead of deeper diamond drilling of targets generated.
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Figure 4: T5 Basal Contact Longsection showing significant intersections >0.5% nickel and a broadening zone of Downhole Electromagnetic conductors.
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Figure 5: Track-mounted Combination RC - Diamond Drill Rig from Topdrive Drillers to arive in early April
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Figure 6: Cross-sections through the T5 Feeder Zone. The intersections to date have been complicated by a set of flat faults and sheared dyke intrusion along the basal contact. Further DHTEM and seismic results will assist in Phase 3 targeting.
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Table 1: Significant Intersection Summary, SG adjusted
| Hole | m From m To Interval |
Ni% | Cu% | Co% | 2PGE* | **Ag g/t ** |
|---|---|---|---|---|---|---|
| CBDD028 | 165.2 167 1.8 |
0.73 | 0.34 | 0.04 | 0.65 | 1.78 |
| including | 165.2 165.6 0.4 |
1.12 | 1.07 | 0.06 | 0.91 | 6.80 |
| CBDD029 | NSA - Hole did not test T5 contact | |||||
| CBDD030 | 431.6 445.5 13.9 |
1.18 | 0.39 | 0.05 | 0.45 | 1.61 |
| including | 436.3 439.5 3.2 |
3.19 | 0.64 | 0.14 | 0.71 | 2.56 |
| CBDD031 | NSA - Hole did not test T5 contact | |||||
| CBDD032 | NSA - Fault blank,T5 contact not tested | |||||
| CBDD033 | 368.5 388.6 20.1 |
1.04 | 0.67 | 0.05 | 0.79 | 2.45 |
| including | 372.52 378.4 5.88 |
1.39 | 0.66 | 0.07 | 0.90 | 2.31 |
| and | 380.7 382.8 2.1 |
1.37 | 0.54 | 0.06 | 2.34 | 2.61 |
| and | 386.15 388.6 2.45 |
1.65 | 2.01 | 0.08 | 0.83 | 7.31 |
| CBDD034 | NSA - Fault blank,T5 contact not tested | |||||
| CBDD035 | 516.8 524.85 8.05 |
0.83 | 0.49 | 0.03 | 0.62 | 2.84 |
| including | 516.8 520.5 3.7 |
1.18 | 0.76 | 0.04 | 0.97 | 5.29 |
| CBDD036 | 505.6 511 5.4 |
0.87 | 0.76 | 0.04 | 0.61 | 3.25 |
| including | 506.15 508.1 1.95 |
1.34 | 1.41 | 0.05 | 0.93 | 6.12 |
| CBDD037 | NSA - Fault blank,T5 contact not tested | |||||
| CBDD039 | NSA - Sheared T5 contact,low tenor sulphides | |||||
| CBDD041 | NSA - Sheared T5 contact,low tenor sulphides | |||||
| CBDD042A | 603.7 608.6 4.9 |
0.96 | 0.35 | 0.04 | 0.29 | 1.35 |
| including | 606.89 608.6 1.71 |
1.63 | 0.66 | 0.07 | 0.43 | 3.12 |
| CBDD043 | Dyked + sheared T5 contact -Awaiting Assays | |||||
| CBDD044 | Sheared T5 contact | |||||
| Note: Intervals | quoted are downhole lengths, true widths are not known due to faulting | |||||
| Intervalgrades | weighted by downhole length and bulk density, | _2PGE refers to Pt + Pd ing/t _ |
Table 2: Drill hole collar details for T5 Drilling
| Hole ID | Final Depth |
Easting | Northing | RL | Dip | Azimuth | Status |
|---|---|---|---|---|---|---|---|
| CBDD0028 | 251 | 367048.96 | 6673939.6 | 421.8 | -60 | 90 | Completed |
| CBDD0029 | 603.8 | 367004.61 | 6673939.07 | 421.6 | -70 | 90 | Completed |
| CBDD0030 | 495.7 | 367030.37 | 6673642.32 | 418.3 | -65 | 90 | Completed |
| CBDD0031 | 591.8 | 366943.09 | 6674243.14 | 424.5 | -65 | 90 | Completed |
| CBDD0032 | 335.6 | 367279.38 | 6673941.27 | 423.3 | -65 | 270 | Completed |
| CBDD0033 | 450 | 367397.53 | 6673657.83 | 422.2 | -65 | 270 | Completed |
| CBDD0034 | 412 | 367361.34 | 6673941.15 | 423.5 | -65 | 270 | Completed |
| CBDD0035 | 581.7 | 367441.86 | 6673659.47 | 423 | -65 | 270 | Completed |
| CBDD0036 | 576.8 | 367420 | 6673620 | 422.4 | -65 | 270 | Completed |
| CBDD0037 | 420.8 | 367425 | 6673625 | 422.4 | -60 | 270 | Completed |
| CBDD0039 | 609.7 | 367450 | 6673710 | 423.6 | -65 | 270 | Completed |
| CBDD0041 | 480.7 | 367400 | 6673500 | 421.9 | -60 | 270 | Completed |
| CBDD0042A | 654.7 | 367403 | 6673500 | 421.9 | -70 | 270 | Completed |
| CBDD0043 | 495.3 | 367449 | 6673940 | 432 | -65 | 270 | Completed |
| CBDD0044 | 699.8 | 367446 | 6673707 | 429.8 | -70 | 256 | Completed |
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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 [email protected]
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.
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Table 3. List of assay results from CBDD042A
| Hole_ID | SampleID | mFrom | mTo | Interval | Ni% | Cu% | Co ppm | Ag g/t | Pt g/t | Pd g/t | As ppm | S% | MgO% |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CBDD042A | ECB10658 | 589.25 | 590.75 | 1.5 | 0.07 | 0.01 | 72 | <0.5 | 0.02 | 0.01 | <5 | 0.02 | 21.31 |
| CBDD042A | ECB10659 | 590.75 | 592.25 | 1.5 | 0.08 | 0.02 | 75 | <0.5 | 0.02 | 0.02 | <5 | 0.02 | 21.47 |
| CBDD042A | ECB10660 | 592.25 | 593.75 | 1.5 | 0.08 | 0.01 | 73 | <0.5 | 0.02 | 0.02 | <5 | 0.02 | 20.89 |
| CBDD042A | ECB10661 | 593.75 | 595.25 | 1.5 | 0.10 | 0.02 | 79 | <0.5 | 0.03 | 0.03 | <5 | 0.03 | 20.97 |
| CBDD042A | ECB10662 | 595.25 | 596.59 | 1.34 | 0.23 | 0.05 | 128 | <0.5 | 0.06 | 0.08 | <5 | 0.48 | 21.31 |
| CBDD042A | ECB10663 | 596.59 | 597.21 | 0.62 | 0.13 | 0.02 | 95 | <0.5 | 0.04 | 0.03 | <5 | 0.31 | 19.98 |
| CBDD042A | ECB10664 | 597.21 | 597.93 | 0.72 | 0.14 | 0.07 | 110 | 0.50 | 0.03 | 0.02 | <5 | 0.61 | 22.22 |
| CBDD042A | ECB10665 | 597.93 | 598.55 | 0.62 | 0.19 | 0.74 | 150 | 6.80 | 0.02 | 0.05 | <5 | 1.66 | 22.47 |
| CBDD042A | ECB10666 | 598.55 | 599.48 | 0.93 | 0.19 | 0.07 | 104 | 0.60 | 0.04 | 0.03 | <5 | 0.34 | 21.39 |
| CBDD042A | ECB10667 | 599.48 | 600.75 | 1.27 | 0.33 | 0.27 | 125 | 2.50 | 0.10 | 0.05 | <5 | 0.56 | 21.89 |
| CBDD042A | ECB10668 | 600.75 | 601.75 | 1 | 0.29 | 0.11 | 115 | 1.00 | 0.02 | 0.01 | <5 | 0.33 | 22.05 |
| CBDD042A | ECB10669 | 601.75 | 602.46 | 0.71 | 0.31 | 0.12 | 140 | 0.60 | 0.04 | 0.03 | <5 | 0.73 | 21.80 |
| CBDD042A | ECB10670 | 602.46 | 603.7 | 1.24 | 0.37 | 0.14 | 184 | <0.5 | 0.13 | 0.06 | <5 | 1.92 | 20.89 |
| CBDD042A | ECB10671 | 603.7 | 604.63 | 0.93 | 0.56 | 0.15 | 259 | 0.50 | 0.30 | 0.09 | <5 | 3.02 | 21.47 |
| CBDD042A | ECB10672 | 604.63 | 605 | 0.37 | 1.21 | 0.26 | 568 | 0.70 | 0.17 | 0.13 | <5 | 6.59 | 20.39 |
| CBDD042A | ECB10673 | 605 | 605.96 | 0.96 | 0.43 | 0.12 | 200 | <0.5 | 0.04 | 0.06 | <5 | 2.23 | 21.89 |
| CBDD042A | ECB10674 | 605.96 | 606.26 | 0.3 | 0.95 | 0.38 | 433 | 1.30 | 0.05 | 0.17 | <5 | 5.04 | 15.90 |
| CBDD042A | ECB10675 | 606.26 | 606.89 | 0.63 | 0.28 | 0.15 | 145 | <0.5 | 0.04 | 0.04 | <5 | 1.50 | 21.64 |
| CBDD042A | ECB10676 | 606.89 | 607.71 | 0.82 | 0.73 | 0.34 | 329 | 0.90 | 0.06 | 0.09 | <5 | 4.10 | 16.66 |
| CBDD042A | ECB10677 | 607.71 | 608.6 | 0.89 | 2.39 | 0.93 | 1055 | 5.00 | 0.07 | 0.60 | <5 | >10.0 | 10.43 |
| CBDD042A | ECB10678 | 608.6 | 609.7 | 1.1 | 0.14 | 0.04 | 121 | <0.5 | 0.01 | 0.01 | <5 | 0.61 | 21.89 |
| CBDD042A | ECB10679 | 609.7 | 610.82 | 1.12 | 0.12 | 0.03 | 114 | <0.5 | 0.01 | 0.00 | <5 | 0.27 | 21.56 |
| CBDD042A | ECB10680 | 610.82 | 611.26 | 0.44 | 0.20 | 0.68 | 149 | 6.90 | 0.06 | 0.04 | <5 | 1.32 | 19.98 |
| CBDD042A | ECB10681 | 611.26 | 612.53 | 1.27 | 0.11 | 0.02 | 103 | <0.5 | <0.005 | 0.00 | <5 | 0.27 | 19.65 |
| CBDD042A | ECB10682 | 612.53 | 613.28 | 0.75 | 0.06 | 0.02 | 65 | <0.5 | 0.01 | 0.00 | <5 | 0.31 | 12.25 |
| CBDD042A | ECB10683 | 613.28 | 614.2 | 0.92 | 0.12 | 0.13 | 122 | 0.70 | 0.02 | 0.01 | <5 | 1.43 | 12.57 |
| CBDD042A | ECB10684 | 614.2 | 614.5 | 0.3 | 0.30 | 0.54 | 333 | 2.40 | 0.01 | 0.02 | <5 | 5.45 | 10.23 |
| CBDD042A | ECB10685 | 614.5 | 615.86 | 1.36 | 0.07 | 0.02 | 79 | <0.5 | <0.005 | 0.00 | <5 | 0.34 | 13.28 |
| CBDD042A | ECB10686 | 615.86 | 617.36 | 1.5 | 0.02 | 0.03 | 74 | <0.5 | 0.01 | <0.001 | <5 | 0.64 | 6.12 |
| CBDD042A | ECB10687 | 617.36 | 618.92 | 1.56 | 0.01 | 0.01 | 54 | <0.5 | <0.005 | 0.00 | <5 | 0.18 | 6.37 |
| CBDD042A | ECB10688 | 618.92 | 620.42 | 1.5 | 0.01 | 0.01 | 56 | <0.5 | <0.005 | <0.001 | <5 | 0.17 | 6.67 |
| CBDD042A | ECB10689 | 620.42 | 621.92 | 1.5 | 0.01 | 0.01 | 63 | <0.5 | <0.005 | <0.001 | <5 | 0.18 | 7.23 |
| CBDD042A | ECB10690 | 621.92 | 623.42 | 1.5 | 0.01 | 0.01 | 56 | <0.5 | <0.005 | <0.001 | <5 | 0.20 | 6.42 |
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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. | DD core samples have been half cut with an |
|
| techniques | cut channels, random chips, or | automatic core saw. |
|
| specific specialised industry |
0.25m-1.1m samples are collected from the core trays |
||
| standard measurement tools |
as marked out by the supervising geologist. |
||
| appropriate to the minerals under | A handheld XRF tool was used to verify the |
||
| investigation, such as down hole | mineralisation with samples reporting >0.3% Ni in |
||
| gamma sondes or handheld XRF | disseminated zones and >1% Ni in the matrix |
||
| instruments, etc.). These examples | sulphide zones. |
||
| should not be taken as limiting the | XRF results have not been reported and are used as |
||
| broad meaning of sampling. | a logging/sampling verification tool only. | ||
| Include reference to measures taken | Core is cut and sampled to ensure the sample is |
||
| to ensure sample representivity and | representative and no bias is introduced. Cutting of |
||
| the appropriate calibration of any | specific, banded or stringer sulphide zoned core is |
||
| measurement tools or systems used. | done 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. | |||
| . | |||
| In cases where ‘industry standard’ | Diamond core drilling was used to obtain 3m length |
||
| work has been done this would be | samples from the core barrel which are then marked |
||
| relatively simple (e.g. ‘reverse |
in one meter intervals, based on core block |
||
| circulation drilling was used to obtain | measurements. |
||
| 1 m samples from which 3 kg was | Samples are selected based on geological logging |
||
| pulverised to produce a 30g charge | boundaries or on nominal meter marks. |
||
| for fire assay’). In other cases more | Collected samples weigh a nominal 2-3 kg |
||
| explanation may be required, such | (depending on sample length). |
||
| as where there is coarse gold that | Samples have been dispatched to an accredited |
||
| has inherent sampling problems. | commercial laboratory in Perth for analysis. |
||
| Unusual commodities or |
Samples are being analysed using a 4-acid digest, |
||
| mineralisation types (e.g. submarine | ME-ICP for 33 elements and ore zone samples are |
||
| nodules) may warrant disclosure of | also being tested for Au & PGE elements using ICP |
||
| detailed information | analysis. | ||
| Drilling | Drill type (e.g. core, reverse |
Drilling was undertaken using NQ2 sized drill core. |
|
| techniques | circulation, open-hole hammer, |
Holes have been collared with mud rotary from |
|
| rotary air blast, auger, Bangka, sonic, | surface, HQ rough cored to top of fresh rock then NQ2 |
||
| etc) and details (e.g. core diameter, | cored to EOH. |
||
| triple or standard tube, depth of | |||
| diamond tails, face-sampling bit or | |||
| other type, whether core is oriented | |||
| andifso, bywhatmethod, etc). |
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| Criteria | JORC Code explanation | Commentary | |
|---|---|---|---|
| Drill | Method of recording and assessing | Core recovery was recorded by the field crew and |
|
| sample | core and chip sample recoveries and | verified by the geologist. |
|
| recovery | results assessed. | RQD measurements were digitally recorded | to |
| Measures taken to maximise sample | ensure 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 |
Diamond core drilling is the highest standard and no |
||
| between sample recovery and grade | relationship has been established between sample |
||
| and whether sample bias may have | recovery and reported grade as the core is in very |
||
| occurred due to preferential loss/gain | good condition. |
||
| of fine/coarsematerial. | |||
| Logging | Whether core and chip samples have | Detailed industry standard of collecting core in core |
|
| been geologically and geotechnically | trays, marking meter intervals & drawing core |
||
| logged to a level of detail to support | orientation lines was undertaken. |
||
| 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 | ||
| Whether logging is qualitative or | and validated in Micromine Software as the drilling |
||
| quantitative in nature. Core (or | progresses. |
||
| costean, channel, etc) photography. | The entire length of all holes is logged. | ||
| The total length and percentage of | |||
| therelevantintersectionslogged. | |||
| Sub- | If core, whether cut or sawn and | Core is half cut using an automatic core saw to |
|
| sampling | whether quarter, half or all core | achieve a half-core sample for laboratory submission. |
|
| techniques | taken. |
The sample preparation technique is considered | |
| and sample | If non-core, whether riffled, tube |
industry best standard practice. |
|
| preparation | sampled, rotary split, etc and |
No field duplicates have been collected in this |
|
| whether sampled wet or dry. | program. Field duplicates will be collected once initial | ||
| For all sample types, the nature, | results are returned and resampling of |
the | |
| quality and appropriateness of the | mineralised zones is warranted. |
||
| sample preparation technique. | Sample sizes are appropriate to the grain size of | the | |
| Quality control procedures adopted | mineralisation. |
||
| for all sub-sampling stages to |
|||
| maximise representivity of samples. | |||
| 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 | |||
| materialbeing sampled. | |||
| Quality of | For geophysical tools, |
No handheld XRF results are reported however |
the |
| assay data | spectrometers, handheld XRF |
tool was used to verify the mineralisation with |
|
| and | instruments, etc, the parameters | reporting >0.3% Ni in disseminated zones and >1% |
|
| laboratory | used in determining the analysis | Ni in the matrix sulphide zones. |
|
| tests | including instrument make and |
DHTEM parameters are as follows; |
|
| model, reading times, calibrations | Tx Loop size: 500 x 800 m |
||
| factors applied and their derivation, | Transmitter: GAP HPTX-70 |
||
| etc. | Receiver: EMIT SMARTem24 | ||
| Nature of quality control procedures | Sensor: EMIT DigiAtlantis |
||
| adopted (e.g. standards, blanks, | Station spacing: 2m to 10m |
||
| duplicates, external laboratory |
Tx Freq: 0.5 Hz |
||
| checks) and whether acceptable | Duty cycle: 50% |
||
| levels of accuracy (i.e. lack of bias) | Current: ~130 Amp |
||
| and precision have been established. | Stacks: 32-64 |
||
| Readings: 2-3 repeatable readings per station | |||
| The verification of significant |
Results verified internally by Company personnel |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| Verification of sampling and assaying |
intersections by either independent oralternative company personnel. |
| The use of twinned holes. Hole CBDD0028 is twinning hole CBP042. No other twinningiswarranted at this stage. |
|
| Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. The data was collected and logged using Excel spreadsheets and validated using Micromine Software. The data will be loaded into an externally hosted andmanaged database. |
|
| Discuss any adjustment to assay data. No adjustments have been made to the assay data otherthan length xSGweighted averaging. |
|
| 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. The holes were pegged using a hand-held GPS+3m The rig was setup over the nominated hole position and final GPS pickup occurred at the completion of the hole. Holes are progressively surveyed by DGPS on a batchbasis. |
| Specificationofthe grid systemused. MGA94_51 |
|
| Quality and adequacy of topographic control. Topography is relatively flat and control is more than adequate given the early stage of the project. A 3D drone ortho-photographic survey had been used to create aDTMofthe project area. |
|
| Data spacing and distribution |
Data spacing for reporting of Exploration Results. Refer to Cross Sections and Plans included |
| Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied. Not applicable, no Mineral Resource is being stated. |
|
| Whether sample compositing has beenapplied No compositing has been applied. Intercepts are quoted aslength weightedintervals. |
|
| 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. 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 reportedif material. The drill hole orientation does not introduce a sample bias. |
| Sample security |
The measures taken to ensure sample security. Samples are in the possession of Estrella’s personnel from field collectiontolaboratory submission. |
| Audits or reviews |
The results of any audits or reviews ofsampling techniques and data. No audits or reviews have been conducted for this release giventhe early stage ofthe project. |
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Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Mineral | Type, reference name/number, |
Carr Boyd Nickel Pty Ltd (a wholly owned subsidiary of |
| tenement and | location and ownership including |
ESR) holds a 100% interest in the nickel and base metal |
| land tenure | agreements or material issues with | rights to the project. |
| status | third parties such as joint ventures, | There are no known impediments to operate in the area. |
| partnerships, overriding royalties, | ||
| native title interests, historical sites, | ||
| wilderness or national park and | ||
| environmental settings. | ||
| The security of the tenure held at the | ||
| time of reporting along with any | ||
| known impediments to obtaining a | ||
| licence to operateinthe area. | ||
| Exploration | Acknowledgment and appraisal of | The Carr Boyd Rocks deposit was discovered by Great |
| done by other | exploration by other parties. |
Boulder Mines, in a joint venture with North Kalgurli Ltd |
| parties | in 1968. The deposit was mined between 1972 and | |
| 1975, during which time they explored for additional | ||
| breccia pipe occurrences near the mine. | ||
| WMC acquired Great Boulder Mines Ltd in 1975, briefly | ||
| reopening the mine in 1977 before closing it permanently | ||
| shortly thereafter due to a collapse in the nickel price. | ||
| The mine had produced 210,000t at 1.44% Ni and 0.46% | ||
| Cu before its closure. | ||
| From 1968 Pacminex Pty Ltd held most of the ground | ||
| over the CBLC outside of the immediate mine area. | ||
| Between 1968 and 1971 they conducted extensive | ||
| exploration programs searching for large basal contact | ||
| and/or stratabound Ni-Cu deposits. It was during this | ||
| time that most of the disseminated and cloud sulphide | ||
| occurrences such as those at Tregurtha, West Tregurtha | ||
| and Gossan Hill were discovered. | ||
| Defiance Mining acquired the regional tenements from | ||
| Pacminex in 1987 and focused on exploration for PGE | ||
| deposits between 1987 and 1990. In 1990 Defiance | ||
| purchased the Carr Boyd Rocks mine from WMC and | ||
| switched focus to the mine area between 1990 and 2001, | ||
| leaving many PGE targets untested. | ||
| From 1990 Defiance dewatered the mine to conduct | ||
| testwork and feasibility studies on the remnant | ||
| mineralisation. Metallurgical testwork, Mineral Resource | ||
| estimations, and scoping studies were completed. | ||
| Around 1996 the focus shifted again to regional | ||
| exploration for large tonnage basal contact deposits. | ||
| In 2001 Titan Resources Ltd (Titan) acquired the project | ||
| and recommenced economic evaluations of the remnant | ||
| material at Carr Boyd Rocks before embarking on | ||
| another regional exploration program focusing on the | ||
| basal contact. An aeromagnetic survey, airborne EM | ||
| reprocessing, and several programs of RAB and RC | ||
| drilling were completed. | ||
| From 2005 Yilgarn Mining entered a JV with Titan and | ||
| continued with some regional exploration, but focused | ||
| most attention in and around the Carr Boyd Rocks mine. | ||
| In 2007 Titan was acquired by Consolidated Minerals Ltd | ||
| (Consmin). Consmin conducted IP surveys and detailed | ||
| gravity surveys, but did not drill any targets before selling | ||
| the project to Salt Lake Mining (SLM) in 2013. SLM | ||
| completed limited drilling to meet expenditure |
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| Criteria | JORC | Code explanation | Code explanation | Code explanation | Commentary | |||
|---|---|---|---|---|---|---|---|---|
| commitments, before selling the project to Apollo | ||||||||
| Phoenix Resources in 2016. | ||||||||
| Apollo sold the project to ESR in 2018. | ||||||||
| Geology | Deposit type, | geological setting | and | The Carr Boyd project lies within the Achaean Yilgarn |
||||
| style of mineralisation. | Craton in a 700km belt of elongate deformed and folded | |||||||
| mafic, ultramafic rocks and volcanic sediments intruded | ||||||||
| by granitoids which is referred to as the Norseman- | ||||||||
| Wiluna Belt. The belt has been divided into several | ||||||||
| geological distinct terranes, with the project area lying at | ||||||||
| the northern end of the Gindalbie terrane (Swager, 1996). | ||||||||
| The geology of the Carr Boyd area is dominated by the | ||||||||
| Carr Boyd mafic-ultramafic intrusive complex (CBIC). | ||||||||
| Several distinctive styles of Ni and Ni-Cu mineralisation | ||||||||
| have been identified within the CBIC. At the Carr Boyd | ||||||||
| Rocks Nickel Mine Ni-Cu mineralisation is hosted within | ||||||||
| several 20 - 60m diameter brecciated pipe-like bodies | ||||||||
| that appear to be discordant to the magmatic | ||||||||
| stratigraphy. Mineralisation is hosted by a matrix of | ||||||||
| sulphides (pyrrhotite, pentlandite, pyrite and |
||||||||
| chalcopyrite) within brecciated Bronzite and altered | ||||||||
| country rock clasts. | ||||||||
| Stratiform Ni-Cu-PGE mineralisation has been identified | ||||||||
| at several different locations within the layered magmatic | ||||||||
| complex. | ||||||||
| Estrella is in the process of re-mapping and reclassifying | ||||||||
| the Carr Boyd Igneous Complex. Previous “Layered | ||||||||
| Intrusive” models are misleading as the complex is made | ||||||||
| up of many overprinted and juxtaposed, smaller layered | ||||||||
| and non-layered intrusives that have progressed from | ||||||||
| Ultramafic to Mafic over time. The complex is better | ||||||||
| described as a magma feeder zone, where the earliest | ||||||||
| melts passing through the Morelands Formation have | ||||||||
| assimilated graphitic sulphidic shales, reached sulphur | ||||||||
| saturation and deposited nickel sulphides along basal | ||||||||
| contacts. | ||||||||
| These basal contacts are not restricted to the base of the | ||||||||
| complex, but can form within the complex, wherever | ||||||||
| access was gained by these earlier flows. | ||||||||
| The complex has then been intruded and inflated over | ||||||||
| time by progressively more mafic, barren magmas to | ||||||||
| produce what we see today. | ||||||||
| Drill hole | A | summary | of |
all | information | All relevant drillhole information can be found in the |
||
| Information | material to the understanding of | the | Tables and sections within the announcement. |
|||||
| exploration | results | including | a |
|||||
| tabulation | of | the | following | |||||
| 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 metres) of the | drill | ||||||
| hole collar | ||||||||
o |
dip and azimuth of | the hole | ||||||
o |
down | hole |
length | and | ||||
| interception | depth | |||||||
o |
hole length. |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| 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. No information is excluded. |
|
| 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. 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 indetail. Intersections are reported on a nominal 1% Ni+Cu cut-off with length x SG weighted intervals. All intercepts are reported using length x SG weighted intervals. |
| The assumptions used for any reporting of metal equivalent values should be clearly stated. No metal equivalents have been stated |
|
| Relationship between mineralisation widths and intercept lengths |
These relationships are particularly important in the reporting of Exploration Results. If the geometry of the mineralisation with respect to the drill hole angle is known, its nature should be reported. If it is not known and only the down hole lengths are reported, there should be a clear statement to this effect (e.g. ‘down hole length, true width not known’). True widths have not been estimated. The T5 zone is variably sheared and faulted. Primary mineralisation has been deposited in a turbid environment. Mineralisation contact angles and continuity cannot be determined and true width estimations would be considered misleading. |
| Diagrams | Appropriate maps and sections (with scales) and tabulations of intercepts should be included for any significant discovery being reported. These should include, but not be limited to a plan view of drill hole collar locations and appropriate sectional views. Maps and sections with drill hole locations are included in the announcement. |
| 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 new drillhole information within this announcement is 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 Everything meaningful and material is disclosed in the body of the report. Geological observations are included in the report. No bulk samples, metallurgical, bulk density, groundwater, geotechnical and/or rock characteristics test were carried out. |
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| Criteria | JORC Code explanation | Commentary | Commentary |
|---|---|---|---|
| samples – size and method of | |
There are no known potential deleterious or contaminating | |
| treatment; metallurgical test results; | substances. | ||
| bulk density, groundwater, |
|||
| geotechnical and rock |
|||
| characteristics; potential deleterious | |||
| orcontaminating substances. | |||
| Further work | The nature and scale of planned | |
Diamond drilling and DHTEM geophysical testing is |
| further work (e.g. tests for lateral | continuing. | ||
| extensions or depth extensions or | |
A Seismic survey is being planned for mid-2021. | |
| large-scale step-out drilling). | |||
| Diagrams clearly highlighting the | |||
| areas of possible extensions, |
|||
| including the main geological |
|||
| interpretations and future drilling | |||
| areas, provided this information is | |||
| not commercially sensitive. |