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Operations
Ghana
Mauritania
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Qualified Person/Assay MethodsMr. Hugh Stuart, BSc., MSc, is the Company's Qualified Person pursuant to NI-43101. Mr. Stuart is the Vice President Exploration of the Company and a Member of the Australasian Institute of Mining and Metallurgy Sampling and Assay Methods All work has been carried out by technically qualified personnel and has been planned and supervised by highly trained and experienced geoscientists. The quality of geochemical analyses has been monitored by the use of blanks, standards, field duplicates and check analyses by a second laboratory. Reverse Circulation Drill Sampling Procedures In the case of dry drilling the bulk sample is collected in a large plastic bag tightly clamped onto the base of the cyclone. The entire length of each RC hole is sampled. A one-metre sample length is used in all holes that might be included in resource estimation. Dry samples, of a nominal 20 kg to 25 kg weight are reduced in size by riffle splitting using a two stage Jones riffle splitter to about 3 kg and then placed in pre-numbered sample bags for dispatch to the assay laboratory. A record is made at the drill site of the sample identity numbers and corresponding intervals, and this is also recorded in the geological log. The Company has routinely employed quality control measures during RC drilling including the use of blow backs after the advance of each rod during RC drilling, cleaning of the cyclone when sample build up is evident, routine logging of RC sample and core recoveries, collection of duplicate RC sample splits, and insertion of blanks and standards for qualitative laboratory performance monitoring. In the case of wet drilling, the bulk sample is collected in a plastic bag, excess water drained and pipe sampling used to collect the assay sample from the bulk sample. Where necessary wet RC drilling is twinned with diamond core drill holes. Drill samples are analysed via 50 gram fire assay digestion with an AAS (Atomic Absorption Spectrophotometry) finish (dll10ppb). Diamond Core Sampling Procedures On arrival at the core yard, the diamond drill hole number is recorded and the trays laid out on the ground in consecutive order. Once thoroughly wet, the individual trays are labeled and photographed using a digital camera, the images from which are stored in a master database. The core is then placed in consecutive order on racks and measured to determine the percentage recovery and marked up into metre intervals. The core structure orientations are then recorded. Rock quality designation is undertaken to record the number and nature of natural breaks in the core (by metre interval) for subsequent geotechnical assessment. Geological information generated by logging is again recorded on custom diamond drill logs. Logging detail includes the description of specific structures and alteration styles, along with their width, intensity and associated mineral assemblage. Where necessary, representative billets of core are selected from each tray and are bagged for dry bulk density determination. Both the tray position and sample bag are clearly labeled with the hole number and interval. Once this process is completed, the billets are returned to the correct position within the trays. Once all technical data has been derived from the core, the core is cut lengthwise using a diamond saw to consistently cut along the orientation line before being correctly placed back into the tray. The half-core is then sampled by pre-determined interval based on geology and alteration (minimum interval 50cm), ensuring that the same side is consistently sampled, and placed into calico bags labeled with the assigned sample number. The resulting samples are then submitted by hole to the laboratory for analysis. The residual half core is catalogued and stored in dedicated side-loading racks in the core yard for reference purposes. The trays are consecutively racked and clearly labeled with the hole number, tray number and interval. Stream sediment sampling: A 20 litre bucket is filled with material from the active portion of the stream, large rocks are removed and the material is sieved to -2mm in the field to yield a 3-5kg sample that is then dried and sieved to -80mesh before assay by 50g fire assay with AAS finish (dll10ppb). Field duplicate samples are taken at every 20th site, blanks and standards are added to every batch submitted. Soil Sampling: A 2-3kg sample is taken from the B horizon, typically at a depth of 50cm. The entire sample is dried and pulverized using a Labtechnics LM 5 mill and a 50g charge sampled for assay by low level fire assay (dll 1ppb). Field duplicate samples are taken at every 20th site, blanks and standards are added to every batch submitted. Trenching: 1 or 2m continuous channel samples are taken from the north side of the trench, 10cm above the base of the trench. The entire sample is pulverized using a Labtechnics LM 5 mill and a 50g charge sampled for assay by fire assay (dll 10ppb). All assaying for Ghana is carried out by the Analabs facility in Bibiani , Ghana with check assays sent to the SGS Laboratory at Tarkwa , Ghana and Genalysis in Perth, Western Australia. At the Tasiast Gold Mine, samples are prepared and analyzed by fire assay using a 50 gram charge at the SGS facility at the Tasiast mine site in compliance with industry standards. Field duplicate samples are taken and blanks and standards are added to every batch submitted. Selected samples from this lab are check assayed each month at other SGS laboratories worldwide. Enchi Project Enchi samples from 2005 and January to March 2006 were prepared and analyzed by fire assay using a 50 gram charge at the Transworld Laboratory facility in Tarkwa, Ghana in compliance with industry standards. Field duplicate samples are taken and blanks and standards were added to every batch submitted. Selected samples from this lab are check assayed each month. |
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