Interim results of the EXTECH-IV seismic-reflection program in the Athabasca Basin, northern Saskatchewan
Bibliographic record
Abstract
Interim results from the EXTECH-IV 2000 seismic-reflection program at the McArthur River mine site include interpretations of the two-dimensional high-resolution and regional profiles, simulated seismic responses for the P2 orebody, and preliminary images from the pseudo three-dimensional survey. Interpreted seismic-reflection data 1) accurately image the sandstone-basement unconformity at a depth of approximately 400 to 600 m; 2) map its offset by the P2 reverse fault; and 3) trace the extension of the 2.5km thick P2 fault system upward through the overlying Athabasca Group sandstone and downward more than 4 km as a listric structure that curves past the southeastern limit of the survey. Lateral variations in sandstone porosity, silicification, or facies changes are inferred from variable reflection response and velocity variations, and angular discordances in stratigraphy suggest onlaps or unconformities that may have resulted from tectonic control on sedimentation. A reflection response from the vicinity of the orebody is apparent. The entire survey and a LITHOPROBE survey to the east are underlain by a bright reflector interpreted as an extensive thick sill, at a depth of approximately 6 km, that may be associated with the Mackenzie Igneous Event (1.265 Ga).
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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 | 0.001 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".