Estimation and Reporting of Mineral Resources. (Criteria listed in section 1, and where relevant in section 2, also apply to this section.) Criteria JORC Code explanation Commentary Database integrity • Measures are taken to ensure that data has not been corrupted by, for example, transcription or keying errors between its initial collection and its use for Mineral Resource estimation purposes. • Data validation procedures used. • No mineral resource estimation activities have been undertaken for the Project. Site visits • Comment on any site visits undertaken by the Competent Person and the outcome of those visits. • If no site visits have been undertaken, indicate why this is the case. • No mineral resource estimation activities have been undertaken for the Project. Geological interpretation • Confidence in (or conversely, the uncertainty of ) the geological interpretation of the mineral deposit. • The nature of the data used and any assumptions made. • The effect, if any, of alternative interpretations on Mineral Resource estimation. • The use of geology in guiding and controlling Mineral Resource estimation. • The factors affecting continuity are both grade and geology. • No mineral resource estimation activities have been undertaken for the Project. Dimensions • The extent and variability of the Mineral Resource expressed as length (along strike or otherwise), plan width, and depth below the surface to the upper and • No mineral resource estimation activities have been undertaken for the Project. Criteria JORC Code explanation Commentary lower limits of the Mineral Resource. Estimation and modelling techniques • The nature and appropriateness of the applied estimation technique(s) and key assumptions, including treatment of extreme grade values, domaining, interpolation parameters and maximum extrapolation distance from data points. If a computer-assisted estimation method was chosen, include a description of the computer software and the parameters used. • The availability of check estimates, previous estimates and/or mine production records and whether the Mineral Resource estimate appropriately accounts for such data. • The assumptions made regarding the recovery of by-products. • Estimating deleterious elements or other non-grade variables of economic significance (e.g. sulphur for acid mine drainage characterisation). • In the case of block model interpolation, the block size in relation to the average sample spacing and the search employed. • Any assumptions behind the modelling of selective...
Estimation and Reporting of Mineral Resources. (Criteria listed in section 1, and where relevant in section 2, also apply to this section.) Criteria JORC Code explanation Commentary Database integrity • Measures taken to ensure that data has not been corrupted by, for example, transcription or keying errors, between its initial collection and its use for Mineral Resource estimation purposes. • Data validation procedures used. • Spitfire supplied validated drill hole data in Micromine format. Collar, assay and coded geology data files were provided. A detailed topography digital terrain model (DTM) was also provided. A sectional geological interpretation of the major geological boundaries was provided by Spitfire in Micromine string format. • As at the date of this report, a total of 236 Reverse Circulation (RC) holes had been drilled in the project area, of which 88 holes were at the Contact Deposit, 101 holes were at Contact North and 27 holes were at Contact South. Site visits • Comment on any site visits undertaken by the Competent Person and the outcome of those visits. • If no site visits have been undertaken indicate why this is the case. • No site visits have been made by the CP, as there is little outcrop, and the Resource estimate was commissioned after drilling had been completed. Geological interpretation • Confidence in (or conversely, the uncertainty of ) the geological interpretation of the mineral deposit. • Nature of the data used and of any assumptions made. • The effect, if any, of alternative interpretations on Mineral Resource estimation. • The use of geology in guiding and controlling Mineral Resource estimation. • The factors affecting continuity both of grade and geology. • The interpretation of the mineralised envelope was largely carried out by assessing manganese grades as dictated by the assay results. This gave an accurate estimate of replacement magnitude as opposed to visual estimation from logging. • The sectional interpretations provided by Spitfire represented the mineralized zones and Contact and Contact North. There was an additional minor footwall zone at Contact North, and a series of discontinuous internal waste zones were also defined. A nominal 4% Mn cutoff was used in conjunction with geological logging was used to define mineralised zones. • A series of wireframe solids were developed from this geological interpretation. Codes were assigned to assay data based on these surfaces.
Estimation and Reporting of Mineral Resources. (The criteria listed in Section 1 and, where relevant, in Section 2, also apply to this Section) Criteria Commentary Database integrity • Collar details, interval grades and survey data were entered from hardcopy historical records. Electronic data were available for recent drilling. Several sections were double blind checked for accuracy verification. Outliers from initial data entry for collar locations and grade results were investigated and corrected. Grade populations and three-dimensional locations were visually inspected in cross-section and also visually compared with historic maps and sections. • Analytical values used for estimation of U3O8% are equivalent U3O8% (eU3O8%) values, which were obtained by down survey using calibrated geophysical instruments. Site Visits • Xx. Xxxx Xxxxxxx, the Competent Person for Mineral Resource Estimation and Reporting, has not visited the property and has relied on Xx Xxx Xxxxxxxxx, the Competent Person for Exploration Results, who has frequently visited the site and was directly responsible for managing the drill hole data collection during the 2007 – 2010 programs. Other mining professionals from Xx. Xxxx Xxxxxxx’s company, Tetra Tech, have also visited the site. Geological Interpretation • There is high confidence in the geologic interpretation. The deposit is stratified and laterally consistent drill hole logging and surface mapping supports this conclusion. • The data source for geologic interpretation is primarily drill hole logs and surface mapping. The model currently assumes minimal post mineralisation faulting. • Deposit domains were confined by corresponding geologic units. • Continuity of geology is on a regional sedimentary scale and is regular. Grade continuity is subject to deposition of carbonaceous material and oxidation reduction interfaces of paleo-groundwater carrying mobilized uranium.
Estimation and Reporting of Mineral Resources. Criteria Commentary Database integrity Measures taken to ensure that data has not been corrupted by, for example, transcription or keying errors, between its initial collection and its use for Mineral Resource estimation purposes. Data validation procedures used. All projects • Geological data is stored centrally within a relational SQL database, MaxGeo’s Datashed 5. MaxGeo acts as Medallion’s database administrator. DataShed software has validation procedures that include constraints, library tables, triggers, and stored procedures. Data that does not pass validation tests must be corrected before upload. All database updates and edits are requested in consultation with Medallion Senior Geologists. • Geological data is collected with Logchief software and uploaded digitally. The software utilises lookup tables, fixed formatting, and validation routines to ensure data integrity prior to upload to the central database. • Medallion utilises the QAQC Dashboard within Datashed 5 software to analyse QAQC data, and batches which do not meet passing criteria are requested to be re‐assayed. Sample grades are checked visually in three dimensions against the logged geology and geological interpretation. Drill hole collar pickups are checked against planned and/or actual collar locations. • The Mineral Resource estimate includes both Medallion and pre-Medallion reverse circulation and diamond hole assay data. • Data validation processes are in place and run upon import into the database to be used for the MRE in Datamine Studio RM by Xxxxxxx-Optiro. Site visits Comment on any site visits undertaken by the Competent Person and the outcome of those visits. If no site visits have been undertaken indicate why this is the case. All projects • Xx Xxxxxx Xxxxxxx is Medallion’s Senior Resource Geologist, a Competent Person, and has prepared all of the geological and mineralisation interpretation for the KMC deposits as part of the Ravensthorpe Gold Project. Xx Xxxxxxx has completed multiple specific site visits. • No site visit has been undertaken by the resource estimation Competent Person, Xx Xxxxxxx Xxxxxx of Xxxxxxx Optiro, who is accepting responsibility for the Gem, Harbour View and Gift Mineral Resource estimates. • No site visit has been undertaken by the resource estimation Competent Person, Xx Xxxxx Xxxxxx of Xxxxxxx Optiro, who is accepting responsibility for the Flag Mineral Resource estimate. • No site visit has been undertaken by the resource estimation Compete...
