2023

RC

·      Samples were collected via a Metzke cone splitter mounted to the cyclone. 1m samples were managed through chute and butterfly valve to produce a 2-4 kg sample. Samples were taken from the point of collar, but only samples from the commencement of saprolite were selected for analysis.

·      Samples submitted to  Bureau Veritas Laboratories, Adelaide, and pulverised to produce the 50 g fire assay charge and 4 acid digest sample.

AC

·      A combination of 2m and 3 m samples were collected in green bags via a rig mounted cyclone. An PVC spear was used to collect a 2-4 kg sub sample from each green bag. Samples were taken from the point of collar.

·      Samples submitted to  Bureau Veritas Laboratories, Adelaide, and pulverised to produce the 50 g fire assay charge and 4 acid digest sample.

2024

SONIC

·      Core was scanned by a SciAps X555 pXRF to determine sample intervals. Intervals through mineralized zones were taken at 10cm. Through waste, sample intervals were lengthened to 50cm. Core was halved by knife cutting. XRF scan locations were taken on an inner surface of the core to ensure readings were taken on fresh sample faces.

·      Samples have been submitted to Bureau Veritas for 4 acid digest ICP analysis.

2023

·      Drilling completed by Bullion Drilling Pty Ltd using 5 ¾" reverse circulation drilling techniques from a Schramm T685WS rig with an auxiliary compressor.

·      Drilling completed by McLeod Drilling Pty Ltd using 75.7 mm NQ air core drilling techniques from an ALMET Aircore rig mounted on a Toyota Landcruiser 6x6 and a 200psi, 400cfm Sullair compressor.

2024

·      Sonic Core drilling completed Star Drilling using 4" core with a SDR12 drill rig. Holes were reamed to 6" or 8" to enable casing and screens to be installed

Aircore & RC

·      Sample recovery was generally good. All samples were recorded for sample type, quality and contamination potential and entered within a sample log.

·      In general, sample recoveries were good with 10 kg for each 1 m interval being recovered from AC drilling.

·      No relationships between sample recovery and grade have been identified. 

·      RC drilling completed by Bullion Drilling Pty Ltd using 5 ¾" reverse circulation drilling techniques from a Schramm T685WS rig with an auxiliary compressor

·      Sample recovery for RC was generally good. All samples were recorded for sample type, quality and contamination potential and entered within a sample log.

·      In general, RC sample recoveries were good with 35-50 kg for each 1 m interval being recovered.

·      No relationships between sample recovery and grade have been identified.

Sonic Core

·      Sample recovery is considered excellent.

Aircore & RC

·      All drill samples were logged by an experienced geologist at the time of drilling. Lithology, colour, weathering and moisture were documented.

·      Logging is generally qualitative in nature.

·      All drill metres have been geologically logged on sample intervals (1-3 m).

Sonic Core

·      Logging was carried out in detail, determining lithology and clay/ sand content. Logging intervals were lithology based with variable interval lengths.

·      All core drilled has been lithologically logged.

2021-onward

·      The use of an aluminum scoop or PVC spear to collect the required 2-4 kg of sub-sample from each AC sample length controlled the sample volume submitted to the laboratory.

·      Additional sub-sampling was performed through the preparation and processing of samples according to the lab internal protocols.

·      Duplicate AC samples were collected from the green bags using an aluminium scoop or PVC spear at a 1 in 25 sample frequency.

·      Sample sizes were appropriate for the material being sampled.

·      Assessment of duplicate results indicated this sub-sample method provided good repeatability for rare earth elements.

·      RC drill samples were sub-sampled using a cyclone rig mounted splitter with recoveries monitored using a field spring scale.

·      Manual re-splitting of RC samples through a riffle splitter was undertaken where sample sizes exceeded 4 kg.

·      RC field duplicate samples were taken nominally every 1 in 25 samples. These samples showed good repeatability for REE.

Sonic Drilling

·      Field duplicate samples were taken nominally every 1 in 25 samples where the sampled interval was quartered.

·      Blanks and Standards were submitted every 25 samples

·      Half core samples were taken where lab geochemistry sample were taken.

·      In holes where column leach test samples have been submitted, full core samples have been submitted over the test areas.

·      Samples were submitted to Bureau Veritas Laboratories, Adelaide for preparation and analysis.

·      Multi element geochemistry were digested by four acid ICP-MS and analysed for Ag, Ce, Cu, Dy, Er, Eu, Gd, Ho, La, Lu, Mg, Na, Nd, P, Pr, Sc, Sm, Tb, Th, Tm, U, Y and Yb.

·      For the sonic samples Ag was removed from the analytical suite and V was included

·      Field gold blanks and rare earth standards were submitted at a frequency of 1 in 25 samples.

·      Field duplicate samples were submitted at a frequency of 1 in 25 samples

·      Reported assays are to acceptable levels of accuracy and precision.

·      Internal laboratory blanks, standards and repeats for rare earths indicated acceptable assay accuracy.

·      Sampling data was recorded in field books, checked upon digitising and transferred to database.

·      Geological logging was undertaken digitally via the MX Deposit logging interface and synchronised to the database at least daily during the drill programme.

·      Compositing of assays was undertaken and reviewed by Cobra Resources staff.

·      Original copies of laboratory assay data are retained digitally on the Cobra Resources server for future reference.

·      Samples have been spatially verified through the use of Datamine and Leapfrog geological software for pre 2021 and post 2021 samples and assays.

·      Twinned drillholes from pre 2021 and post 2021 drill programmes showed acceptable spatial and grade repeatability.

·      Physical copies of field sampling books are retained by Cobra Resources for future reference.

·      Elevated pXRF grades were checked and re-tested where anomalous. pXRF grades are semi quantitative.

Pre 2021

·      Collar locations were pegged using DGPS to an accuracy of +/-0.5 m.

·      Downhole surveys have been completed for deeper RC and diamond drillholes

·      Collars have been picked up in a variety of coordinate systems but have all been converted to MGA 94 Zone 53. Collars have been spatially verified in the field.

·      Collar elevations were historically projected to a geophysical survey DTM. This survey has been adjusted to AHD using a Leica CS20 GNSS base and rover survey with a 0.05 cm accuracy. Collar points have been re-projected to the AHD adjusted topographical surface.

2021-onward

·      Collar locations were initially surveyed using a mobile phone utilising the Avenza Map app. Collar points recorded with a GPS horizontal accuracy within 5 m.

·      RC Collar locations were picked up using a Leica CS20 base and Rover with an instrument precision of 0.05 cm accuracy.

·      Locations are recorded in geodetic datum GDA 94 zone 53.

·      No downhole surveying was undertaken on AC holes. All holes were set up vertically and are assumed vertical.

·      RC holes have been down hole surveyed using a Reflex TN-14 true north seeking downhole survey tool or Reflex multishot

·      Downhole surveys were assessed for quality prior to export of data. Poor quality surveys were downgraded in the database to be excluded from export.

·      All surveys are corrected to MGA 94 Zone 53 within the MX Deposit database.

·      Cased collars of sonic drilling shall be surveyed before laboratory results are reported.

·     Drillhole spacing was designed on transects 50-80 m apart. Drillholes generally 50-60 m apart on these transects but up to 70 m apart.

·     Additional scouting holes were drilled opportunistically on existing tracks at spacings 25-150 m from previous drillholes.

·     Regional scouting holes are drilled at variable spacings designed to test structural concepts

·     Data spacing is considered adequate for a saprolite hosted rare earth Mineral Resource estimation.

·     No sample compositing has been applied

·     Sonic core holes were drilled at ~20m spacings in a wellfield configuration based on assumed permeability potential of the intersected geology.

·     RC drillholes have been drilled between -60 and -75 degrees at orientations interpreted to appropriately intersect gold mineralisation

·     Aircore and Sonic drill holes are vertical.

Pre 2021

·    Company staff collected or supervised the collection of all laboratory samples. Samples were transported by a local freight contractor

·    No suspicion of historic samples being tampered with at any stage.

·    Pulp samples were collected from Challenger Geological Services and submitted to Intertek Genalysis by Cobra Resources' employees.

2021-onward

·    Transport of samples to Adelaide was undertaken by a competent independent contractor. Samples were packaged in zip tied polyweave bags in bundles of 5 samples at the drill rig and transported in larger bulka bags by batch while being transported.

·    There is no suspicion of tampering of samples.

·    No laboratory audit or review has been undertaken.

·    Genalysis Intertek and BV Laboratories Adelaide are NATA (National Association of Testing Authorities) accredited laboratory, recognition of their analytical competence.