Matrix permeability testing in the fault-hosted Gryphon U deposit (eastern Athabasca Basin, Canada): Insights into fluid-rock interactions related to deposit formation and redistribution
Bibliographic record
Abstract
As a demonstration of the utility of testing permeability of rocks, in this study the matrix permeability was tested across a wide fault zone in Precambrian metasedimentary rocks at the basement-hosted Gryphon uranium deposit. It is part of the Wheeler River project by Denison Mines in Athabasca Basin, Saskatchewan, Canada.The permeability tests were done on unconfined dry uncut drill core pieces (4.7 to 6.1 cm diameter), sampled from inclined exploration drill holes. A portable nitrogen gas probe permeameter device was constructed and adapted for testing spots on whole drill core pieces. The device features a stiff aluminum metal frame and can hold a variety of drill core sizes. A pressure-decay method was used, with initial gas pressure charged to about 50 psi (pounds per square inch), equivalent to approximately 0.345 MPa, charged from an external tank, and an intermediate container.793 tests had good quality results of 900 attempted tests. In the failed (rejected) tests, a small leak occurred in about 5% of the samples, and a large leak in another 5%. In basement lithologies 666 tests were successful.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.003 | 0.004 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.006 | 0.004 |
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".