Dendrochemistry and soil clay geochemistry applied to exploration for deep U mineralization at the Halliday Lake Prospect, Athabasca Basin, Canada
Bibliographic record
Abstract
Drilling at the c. 750 m deep Halliday Lake prospect in the Athabasca Basin has identified features favourable for unconformity-related U mineralization such as sandstone enrichments in pathfinder elements, graphitic metapelite gneiss, sandstone and basement hosted faulting, hydrothermal alteration and sub-economic U mineralization. Soils, jack pine ( Pinus banksiana ) and black spruce ( Picea mariana ) tree cores were collected on a 250 m sampling grid to assess their effectiveness as exploration geochemical media for concealed mineralization. The <2 µm soil clay-size fractions comprise mixtures of quartz, chlorite, illite, kaolinite, and plagioclase with the plagioclase reflecting basement boulders transported in the Quaternary cover. Basement rocks in the till impart a geochemical signature enriched in K, Ba, Bi, Co, Cr, Cs, Cu, Li, Mn and Ni, complicating the interpretation of some pathfinder elements in the <2 µm soil clay-size fraction. Tree cores have Mo, Co, Cu and S enrichments in areas of thin overburden also associated with sandstone hosted hydrothermal alteration and pathfinder element enrichment. Radiogenic Pb isotope ratios in the <2 µm soil clay-size fraction are associated with drill holes hosting sub-economic U mineralization whereas barren drill holes are spatially associated with common Pb isotope ratios. Radiogenic tree core Pb isotope ratios are supportive of the <2 µm soil clay-size fraction Pb isotope ratios.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".