Seismic imaging of porphyry deposits with distributed acoustic sensing of fibre-optic cables: a summary of results at the New Afton Cu-Au mine, British Columbia
Bibliographic record
Abstract
We present a summary of physical rock properties and vertical seismic profiling (VSP) results acquired with distributed acoustic sensing (DAS) in boreholes that intersect the main mineralized zone and alteration halo at the New Afton Cu-Au porphyry deposit, British Columbia. We used an advanced DAS system that achieves signal-to-noise ratio of conventional geophones but offers high-density sensing of the entire fibre-optic cable. Straight and helically wound fibre-optic cables specifically engineered for the advanced DAS system were installed in two boreholes and compared with conventional fibre-optic cables with similar configurations connected to a standard DAS interrogator. Comparison of raw field data and processed data of both systems demonstrates a significantly higher signal-to-noise ratio for the new DAS system. Processed VSP data show several reflections with shallow dips that are mostly explained by faults and fractures observed in wireline logs and intersecting the surveyed boreholes.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| 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".