DENISON MINES CORP.
For the period ended Dec 31, 2023. Filed Mar 28, 2024.
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The yearly report of certain Canadian companies, filed under a joint US and Canadian system. It is the main yearly account these companies give US investors, largely as filed in Canada.
FY2023 · Filed Mar 28, 2024
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Contents
EX-99.1 · Exploration Samples
Exploration Samples
Three other types of drill core samples are collected during routine exploration, the results of which are used to prioritize drill holes for follow-up exploration or determine geochemical and/or alteration vectors toward mineralization, as follows:
| 1. | Composite geochemical samples are collected over approximately 10-metre intervals in the upper Athabasca sandstone and in fresh lithologies beneath the unconformity (basement) and over 5-metre intervals in the basal sandstone and altered basement units. The samples consist of 1 to 2 centimetre thick disks of core collected from the top or bottom of each row of core in the box over the specified interval. Care is taken not to cross lithological contacts or stratigraphic boundaries. These samples are submitted to SRC for sample preparation and multi-element analysis. The same sample preparation procedures are used as described above for U3O8 assay samples. The pulps are analyzed using the ICPMS Exploration Package, which includes a total digest (HF:HNO3:HCIO4) and partial digest (HNO3:HCl) followed by ICP-MS analysis. Boron values are obtained through NaO2/NaCO3 fusion followed by ICP-OES. |
| 2. | Representative/systematic core disks (one to five centimetres in width) are collected at regular 5 to 10-metre intervals throughout the entire length of core until basement lithologies become unaltered. These samples are analyzed for clay minerals using reflectance spectroscopy. Samples for reflectance clay analyses are analyzed by Denison using an ArcSpectro FT-NIR ROCKET spectrometer and sent to AusSpec International Ltd. for interpretation. |
| 3. | Select spot samples are collected from significant geological features (i.e. radiometric anomalies, structure, alteration etc.). Core disks ranging from 1 to 2 centimetres thick are collected for reflectance spectroscopy, while split core samples are collected for geochemical analysis. The same reflectance spectrometry or geochemical procedures as described above are used. |
These sampling types and approaches are typical of uranium exploration and definition drilling programs in the Athabasca Basin.
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