Drilling to Results.
As found in
Page 13, (Sep) “Quarterly Exploration Report”
Havieron Project (Greatland Gold plc farm-in agreement): JORC Table 1
Sampling Techniques and Data.
Core samples are obtained from core drilling in Proterozoic basement lithologies. PQ-HQ and NQ diameter core was drilled on a 6m run. The core was cut using an automated core-cutter and half core sampled at 1m intervals with breaks for major geological changes. Sampling intervals range from 0.2 – 1.0m. Cover sequences were not sampled.
Permian Paterson Formation cover sequence was drilled using mud rotary drilling. Depths of cover typically observed to approximately 420m vertically below surface. Steel casing was emplaced to secure the pre-collar.
Core drilling was advanced from the base of the cover sequence with PQ3, HQ3 and NQ2 diameter coring configuration. Core from inclined drill holes are oriented on 3m and 6m runs using an electronic core orientation tool (Reflex ACT III). At the end of each run, the bottom of hole position is marked by the driller, which is later transferred to the whole drill core run length with a bottom of the hole reference line.
Drill sample recovery
Core recovery is systematically recorded from the commencement of coring to end of the hole, by reconciling against driller’s depth blocks in each core tray with data recorded in the database. Drillers depth blocks provided the depth, interval of core recovered, and interval of core drilled.
Core recoveries were typically 100%, with isolated zones of lower recovery.
Cover sequence drilling by the mud-rotary drilling did not yield recoverable samples.
(Sept Qtr 2020) Geological logging recorded qualitative descriptions of lithology, alteration, mineralisation, veining, and structure (for all core drilled – 24,644m from 34 drill holes, all intersecting mineralisation), including orientation of key geological features.
Geotechnical measurements were recorded including Rock Quality Designation (RQD) fracture frequency, solid core
recovery and qualitative rock strength measurements. Magnetic susceptibility measurements were recorded every metre. The bulk density of selected drill core intervals was determined at the site on whole core samples.
All geological and geotechnical logging was conducted at Havieron site.
Digital data logging was captured on diamond drill core intervals only, and all data validated and stored in an acQuire database.
All drill cores were photographed, prior to cutting and/or sampling the core.
Sub-sampling Techniques and Sample Preparation
Sampling, sample preparation and quality control protocols are considered appropriate for the material being sampled. The Core was cut and sampled at the Telfer and Havieron core processing facility. Half core samples were collected in prenumbered calico bags and grouped in plastic bags for dispatch to the laboratory. Sample weights typically varied from 0.5 to 4kg. Sample sizes are considered appropriate for the style of mineralisation. Drill core samples were freighted by air and road to the laboratory.
Sample preparation was conducted at the independent ISO17025 accredited Intertek Laboratory, Perth (Intertek).
Samples were dried at 105oC and crushed to 95% passing 4.75mm, and then split to obtain up to 3kg sub-sample, which was pulverised (using LM5) to produce a pulped product with the minimum standard of 95% passing 106μm.
Duplicate samples were collected from crush and pulp samples at a rate of 1:20. Duplicate results show an acceptable level of variability for the material sampled and style of mineralisation.
Periodic size checks (1:20) for crush and pulp samples and sample weights are provided by the laboratory and recorded in the acQuire database.
Quality of Assay Data and Laboratory Tests
Assaying of drill core samples was conducted at Intertek. All samples were assayed for 48 elements using a 4-acid
digestion followed by ICP-AES/ICP-MS determination (method 4A/MS907). Gold analyses were determined by 50g fire assay with AAS finish (method FA50N/AA).
Sampling and assaying quality control procedures consisted of inclusion of certified reference material (CRMs), coarse residue and pulp duplicates with each batch (at least 1:20).
Assays of quality control samples were compared with reference samples in acQuire database and verified as
acceptable prior to the use of data from analysed batches. Laboratory quality control data, including laboratory standards, blanks, duplicates, repeats and grind size results are captured in the acQuire database and assessed for accuracy and precision for recent data. Extended quality control programs including pulp samples submitted to an umpire laboratory and combined with more extensive re-submission programs have been completed.
Analysis of the available quality control sample assay results indicates that an acceptable level of accuracy and precision has been achieved and the database contains no analytical data that has been numerically manipulated.
The assaying techniques and quality control protocols used are considered appropriate for the data to be used for
reporting exploration drilling results.
Verification of Sampling and Assaying
Sampling intervals defined by the geologist are electronically assigned sample identification numbers prior to core
cutting. Corresponding sample numbers matching pre-labelled calico bags are assigned to each interval.
All sampling and assay information were stored in a secure acQuire database with restricted access.
Electronically generated sample submission forms providing the sample identification number accompany each
submission to the laboratory. Assay results from the laboratory with corresponding sample identification are loaded
directly into the Acquire database.
Assessment of reported significant assay intervals was verified by re-logging of diamond drill core intervals and
assessment of high-resolution core photography. The verification of significant intersections has been completed by
company personnel and the Competent Person/Qualified Person.
No adjustments are made to assay data, and no twinned holes have been completed. Drilling intersects mineralisation at various angles.
There are no currently known drilling, sampling, recovery, or other factors that could materially affect the accuracy or reliability of the data.
Location of Data Points
Drill collar locations were surveyed using a differential GPS with GNSS with a stated accuracy of +/- 0.5m for all drill
Drill rig alignment was attained using an electronic azimuth aligner. The downhole survey was collected at 6-12m intervals in the cover sequence and every 6 to 30m in diamond drill core segments of the drill hole using single shot (AxisMining Champ Gyro). The single-shot surveys have been validated using the continuous survey to surface (Axis Mining Champ) along with a selection of drill holes re-surveyed by an external survey contractor using a DeviGyro tool – confirming sufficient accuracy for downhole spatial recording.
Topographic control is established from SRTM (1 second) topographic data and derived digital elevation model. The
the topography is generally low relief to flat, with an average elevation of 265 m, within dune corridors.
All collar coordinates are provided in the Geocentric Datum of Australian (GDA94 Zone 51). All relative depth information is reported in Australian Height Datum (AHD).
Data Spacing and Distribution
The drill hole spacing ranges from 50–100m within the south-eastern Crescent sulphide zone to 50-300m in lateral
the extent within the breccia zone over an area of ~2km2.
Significant assay intercepts remain open. Further drilling is required to determine the extent of currently defined
mineralisation. No sample compositing is applied to samples.
The Orientation of Data in Relation to Geological Structure
Drill holes exploring the extents of the Havieron mineral system intersect moderately dipping carbonate and siliclastic sedimentary facies, mineralised breccia and sub-vertical intrusive lithologies. Geological modelling has been interpreted from historic and Newcrest drill holes. Variable brecciation, alteration and sulphide mineralisation is observed with a footprint with dimensions of 650m x 350m trending in a north-west orientation and over 900m in vertical extent below cover.
The subvertical southeast high grade arcuate crescent sulphide zone has an average thickness of 20m and has been
defined over a strike length of up to 550m, and over 600m in vertical extent below cover.
Drilling direction is oriented to intersect the steeply dipping high-grade sulphide mineralisation zones at an intersection angle of greater than 40 degrees. The drilled length of reported intersections is typically greater than true width of mineralisation.
The security of samples is controlled by tracking samples from drill rig to the database.
Drill core was delivered from the drill rig to the Havieron core yard every shift. On completion of geological and
geotechnical logging, the core was transported by vehicle to Telfer core processing facility by Newcrest personnel.
High-resolution core photography and cutting of drill core was undertaken at the Havieron or Telfer core processing
Samples were freighted in sealed bags by air and road to the Laboratory and in the custody of Newcrest
representatives. Sample numbers are generated directly from the database. All samples are collected in pre-numbered calico bags. Verification of sample numbers and identification is conducted by the laboratory on receipt of samples, and sample receipt advises issued to Newcrest.
Details of all sample movement are recorded in a database table. Dates, Hole ID sample ranges, and the analytical
suite requested are recorded with the dispatch of samples to analytical services. Any discrepancies logged at the receipt of samples into the analytical services are validated.
Audits or reviews
Due to the limited duration of the program, no external audits or reviews have been undertaken. Internal verification and audit of Newcrest exploration procedures and databases are periodically undertaken.
Section 2 Reporting of Exploration Results.