Sampling techniques |
· Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling. |
· Industry standard RC drilling, sampling and assay designed to test target areas of potential gold mineralisation considered likely to enhance the previously identified resource. |
| · Include reference to measures taken to ensure sample representivity and the appropriate calibration of any measurement tools or systems used. |
· Collar locations were picked up using handheld GPS. · Downhole survey shots were taken at 30 metre intervals using Reflex electronic single shot. |
| · Aspects of the determination of mineralisation that are Material to the Public Report. |
· Every metre drilled was sampled, logged and assayed to industry standards. |
| · In cases where 'industry standard' work has been done this would be relatively simple (eg 'reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay'). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may warrant disclosure of detailed information. |
· Reverse circulation drilling was used to obtain 1 m samples from which 1 kg was pulverised to produce a 50 g charge for fire assay |
Drilling techniques |
· Drill type (eg core, reverse circulation, open-hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard tube, depth of diamond tails, face-sampling bit or other type, whether core is oriented and if so, by what method, etc). |
· Drilling was carried out using a 4¾ inch reverse circulation face sampling hammer bit. |
Drill sample recovery |
· Method of recording and assessing core and chip sample recoveries and results assessed. |
· Qualitative observations were recorded in geology logs. |
| · Measures taken to maximise sample recovery and ensure representative nature of the samples. |
· Some sample loss was experienced in the first metre or two of each hole but overall sample recovery was very good |
| · Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material. |
· As sample recovery was very good it is unlikely that such a relationship could be established. |
Logging |
· Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies. |
· All drill samples were was geologically logged and photographed |
| · Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography. |
· All drill samples were geologically logged and photographed |
| · The total length and percentage of the relevant intersections logged. |
· 100% |
Sub-sampling techniques and sample preparation |
· If core, whether cut or sawn and whether quarter, half or all core taken. |
· No core drilled |
| · If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry. |
· Rotary split |
| · For all sample types, the nature, quality and appropriateness of the sample preparation technique. |
· Accepted industry standard sampling process |
| · Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples. |
· QAQC procedures were followed as per industry best practice including the use blanks, duplicates and certified reference material standards. |
| · 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. |
· Field duplicates were inserted every 30 samples |
| · Whether sample sizes are appropriate to the grain size of the material being sampled. |
· A 2 kg sub sample from 30 kg with particle size sub 10mm is within the acceptable sample size range. |
Quality of assay data and laboratory tests |
· The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total. |
· Fire assay was used to determine total gold content |
| · For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc. |
· Not applicable |
| · Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (ie lack of bias) and precision have been established. |
· Internal laboratory quality control was applied and duplicates run on all samples over 2g/t Au. Accuracy and precision was deemed acceptable. |
Verification of sampling and assaying |
· The verification of significant intersections by either independent or alternative company personnel. |
· Yes |
| · The use of twinned holes. |
· No |
| · Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. |
· Validation processes integrated with data entry procedure. |
| · Discuss any adjustment to assay data. |
· None required |
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. |
· Hand held GPS averaged over 10 minute interval · Downhole survey shots were taken at 30 metre intervals using Reflex electronic single shot. |
| · Specification of the grid system used. |
· The Spring Hill mine grid comprises the following adjustments relative to GDA94 zone52: o Rotation -28.16degrees o East translation -790,091.789m o North translation -8,480,800.386m o Mine Grid RL = AHD + 976.75m |
| · Quality and adequacy of topographic control. |
· < 5m |
Data spacing and distribution |
· Data spacing for reporting of Exploration Results. |
· As per drill hole location plan |
| · 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 |
| · Whether sample compositing has been applied. |
· Significant intercepts are calculated as length weighted averages |
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. |
· Drilling is oriented to minimise sample bias as much as possible. Interpreted true thicknesses are provided where possible. Whether a quoted mineralised interval is downhole or considered true is indicated throughout the report. |
| · 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 reported if material. |
· Yes, and has therefore been addressed. |
Sample security |
· The measures taken to ensure sample security. |
· Direct delivery by Thor personnel to the assay laboratory. |
Audits or reviews |
· The results of any audits or reviews of sampling techniques and data. |
· Not available. |