Coyote & Paulsens High-Grade JORC Resources Confirmed
Air core, RAB and vacuum drilling were carried out jointly by Glengarry Resources and Tanami Gold NL. Barrick Gold drilled two deep diamond drillholes between 2000 - 2003. Extensive RC and diamond drilling were carried out by Tanami Gold NL following the acquisition and control of the entire project.
Only RC and diamond drilling has been used in the Resource.
Sampling and Sub Sampling Techniques
RC samples were split into 1m intervals, targeting a 3kg sample, via a rig mounted 12.5% to 87.5% three tier riffle splitter. Where rare wet samples occurred, these were grab sampled and not put through the splitter. These samples were collected directly into calico sample bags. The remaining 87.5% sample split was collected in plastic sample bags. The cyclone and splitter were cleaned at the start and end of each hole using a compressed air gun. For wet holes the cyclone and splitter were cleaned every 6m rod. Chips were logged for lithology, moisture content, recovery, mineralisation, and weathering. Chip trays were photographed and archived.
Duplicate samples were selected at a rate of 1:30 samples by the rig geologists from the sample retention bags and re- split. Blank and standard material was inserted at a rate of 1:30.
Diamond core was drilled from surface using HQ3, NQ & NQ2, with triple tubing utilised where required to improve core recovery. Core recovery was poor in some highly weathered zones but good in most of the fresh rock areas. Most core was cut and ½ core sampled. A small number of holes were ¼ core sampled with the remaining half core used for metallurgical testing. Diamond core was logged for lithology, mineralisation, and weathering. Core was orientated on the bottom of the hole and structural measurements recorded where possible.
Diamond core was sampled in geologically selective intervals to better target mineralisation and geological boundaries. Samples taken were a minimum of 0.2m and a maximum of 1m. Diamond holes were samples in 1m increments approximately 30m either side of target zones. Commercially certified standards were inserted after 2004 at a rate of 1:30.
Drill samples used in the Resource were prepared at a commercial laboratory. Samples were crushed and dried before being pulverised to >85% passing 75 microns. A 50g charge was fired and residue dissolved in aqua regia digest. The assays were finished via atomic absorption spectroscopy to a precision of 0.01 ppm. RAB, Vac and soil samples utilised different multielement assay techniques however these were not used in the mineral resource.
Criteria Used for Resource Estimation
A review of the Resource was completed during the due diligence process to investigate the confidence in the reported Resource. No fatal flaws in the estimation of the Resources were identified. Classification of the Resource originally completed by Tanami Gold was reviewed based off all available information. Resource classifications assigned by Tanami Gold were found to be acceptable and have been rereported for this announcement.
Mineralisation and weathering wireframes were constructed using Micromine software. Models of the geological units were used as guides for the mineralised vein interpretations. Both Ordinary Kriging and Inverse Distance Squared estimations methods were used.
Drill hole data was composited downhole to 1m for all mineralised domains and treated as hard boundaries for domains.
Estimation domains were grouped together for top cut analysis and extreme outliers were investigated. A global top cut of 35 g/t was used to control the impact of high-grade composites on the estimate. Only a very small number of composites (8 total) of samples were affected by top cutting.
Variograms were modelled within major mineralisation areas to determine primary directions and distances of continuity. These variograms were then used to create search ellipsoids which were applied to the individual domains. Adjustments to the search ellipsoids and orientations to suit individual domains was undertaken. Multiple orientation search ellipsoids were used for each domain and restricted by coordinate filters. Parent block sizes of 20m (X), 2.5m (Y) and 10m (Z) were used with sub-celling down to 2m (X), 0.5m (Y), 1m (Z) was used to honour mineralisation volumes.
Bulk density values were applied according to regolith type and are based off density measurements of diamond core.
The Resource was validated through comparison of input assay data against the modelled grades. This was completed by checking the global averages of each domain, visually checking the spatial distributions of grade, assessing swath plots.