Geology and Geological Interpretation: Zn-Cu-Ag mineralisation at Altair is interpreted to dip to the south at around 50 with an average thickness of around 140m. It is currently defined over a strike of around 750m. Mineralisation is best developed towards the base of a black shale sequence and occurs as fine to very fine-grained red/brown sphalerite and fine-grained chalcopyrite associated with semi-massive pyrite and magnetic pyrrhotite located in folded sub-millimetre stratiform layers interpreted to reflect original bedding plane deposition. The black shale host rock, altered underlying intermediate volcanics, and overlying felsic units and sediments at Altair form a parasitic fold on the western limb of a regional syncline, both displaying NW-trending fold axes. Mineralisation remains open down plunge to the east and along strike to the north. Oxidation extends to between approximately 60m and 140m below surface. Zn depletion with markedly lower Zn grades, and Cu enrichment with elevated Cu grades is apparent in both the oxide and transition zones. Zn mineralisation is dominant over Cu mineralisation in fresh rock. Drilling Techniques: Pre-2012 Drillholes: Diamond core, Reverse Circulation (RC), and Aircore (AC) drilling data was used in the MRE. RC drilling by Goldfields Exploration was completed with industry standard RC drill rigs using face sampling RC drilling techniques. AC drilling by Pancontinental and Goldfields Exploration was completed with industry standard AC drill rigs using reverse circulation blade bits. Diamond drilling was completed with an industry standard diamond drill rig acquiring NQ diamond core
with core oriented when possible. Some orientation marks have faded or disappeared. RC drill holes were routinely surveyed for down hole deviation using industry standard downhole cameras set to collect readings every 5m down each hole. Post-2012 Drillholes: RC drilling was completed with industry standard RC drill rigs using face sampling RC drilling techniques with 5 ¼" hammers and nominal 143mm tungsten button drill bits.
Most diamond holes were drilled with RC pre-collars. Diamond drilling was completed with industry standard diamond drill rigs acquiring HQ or NQ2 diamond core with all core oriented whenever feasible. Drill core was orientated using "Ori-Mark" or Reflex "Ezi-Mark" orientation tools, with core initially cleaned and pieced together at the drill site. Core was then reconstructed into continuous runs on an angle iron cradle for down hole depth marking and then fully orientated with all orientation lines marked up by field staff at the Gidgee core shed. Drill holes are routinely surveyed for down hole deviation using industry standard gyros set to collect readings every 5m or 10m down each hole. Pre-2012 Drillholes: RC cuttings were collected at 1m intervals and composited by riffle splitter into 2m or 4m samples. AC samples were composited by spear sampling into 2m or 4m samples. Approximately 2 to 3kg samples were collected. Measures taken to ensure that the sampling is representative include regular cleaning of cyclones, and
sampling equipment to prevent contamination. Duplicate RC and AC samples were collected at every 30 sample in the sample sequence. Diamond core drilling (ALDD001) completed by Pan Continental Mining in 1993 involved 1m and 2m sampling. The diamond core was cut in half for sampling, however some quarter core was sampled subsequent to half core sampling and presumably submitted for analysis or thin section work. Post-2012 Drillholes: The upper non-prospective sections of some RC holes were either not sampled or sampled at 4m intervals using a PVC spear to generate composite assay samples. Samples through more prospective zones were collected at the drill rig every metre using a rig-mounted cone splitter to collect a nominal 2 to 3kg sub sample. Where warranted, individual 1m assay samples covering anomalous 4m composite samples (+0.2% Zn) were submitted for analysis. A qualitative estimate of sample recovery was done for each RC sample collected from the drill rig. Selected HQ3 and NQ2 diamond core was halved using an on-site Almonte diamond saw and half core sampled over 1m intervals for mineralised intervals as determined by the supervising geologist. Duplicate samples are quarter core cut from the remaining half core. Sampling for both RC and diamond core was undertaken using HRN sampling protocols and QAQC procedures in line with industry best practice, with laboratory standard (certified reference material), duplicate and blank samples were inserted/collected at every 25 sample in the sample sequence, or prior to 2020 one laboratory standard or blank sample inserted at every 20 sample in the sample sequence. Selected samples are also re-analysed to confirm anomalous results. Laboratory in-house QAQC included insertion of certified standards, blanks, check replicates and fineness checks to ensure grind size of 85% passing <75µm.
Measures taken to ensure that the sampling is representative include regular cleaning of cyclones, splitters and sampling equipment to prevent contamination; statistical comparison of duplicate samples; and statistical comparison of anomalous 4m composite assays versus average of follow up
1m assays where collected. RC and diamond core sample sizes and laboratory preparation techniques are considered to be appropriate for the commodities being targeted. Sample Preparation and Analysis Method: Pre-2012 Drillholes: Sample preparation, gold analysis by fire assay, and As, Cu, Pb, Zn, Ag, Bi, Mo, Sn, Ba analysis was completed at off-site laboratories where RC, AC and core samples were weighed, dried and crushed
as per industry standards at the time. Analysis methods were not recorded in the pre-2012 drilling reports. Laboratory quality control procedures included insertion of standards and blanks. Laboratory QAQC data is not available for some of the historical drilling to review. There is no evidence to suspect that any issues with assaying occurred. An analysis of duplicates showed that in general the repeatability of sample results was very good. Post-2012 Drillholes: All samples were submitted to Australian Laboratory Services (ALS Perth) for preparation where RC and core samples were weighed, dried and crushed to between 3mm and 6mm. Crushed samples were subsequently bulk-pulverised in a ring mill to achieve a nominal particle size between 85% to 90% passing <75µm. RC and core sample analysis was completed by four-acid digest for 31 or 33 element ICP determination (code ME-ICP61a or ME-ICP61). Over-Limit (i.e. >1%) Zn and Cu values were re- assayed by Ore Grade four-acid digest ICP determination (code OG62). Over-Limit (>1%) S values were re-assayed by the S-IR08 method. Selected analysis for gold only was undertaken at ALS Perth for preparation and analysis for gold by 50g fire assay with AAS finish to a lower detection limit of 0.01ppm.