Wireline logging and distributed acoustic sensing VSP to characterize host rocks and alteration of porphyry deposits: preliminary results from the New Afton mine
Bibliographic record
Abstract
Wireline logs and vertical seismic profile (VSP) data were acquired in two boreholes intersecting the Cu-Au New Afton porphyry deposit located near Kamloops, British Columbia. The wireline logs and VSP data are components of an integrated geophysical imaging and 3D geological modelling study that aims to improve knowledge of the role of magmatic hydrothermal processes and structural controls in concentrating metals in porphyry deposits. Log data provide physical rock properties for the propylitic, phyllic, and potassic alteration zones. Both propylitic and phyllic zones are characterized by a broad distribution of density and P-wave velocities whereas the feldspar-dominant potassic alteration zone has generally high velocities. The VSP survey was conducted with a distributed acoustic sensing (DAS) system that utilized fibre-optic cables cemented in two boreholes at the New Afton mine. Fibre-optic cables comprised standard and ConstellationTM fibres in both straight and helically-wound configurations for comparison purposes. Seismic sources consisted of fifty shot points each loaded with one kilogram of pentolite explosive placed in a 20 m deep shot hole. VSP data from both types of fibre show clear down going waves and reflections although signal-to-noise ratio is significantly higher on the ConstellationTM fibre-optic cable. A preliminary analysis of VSP data from one shot point shows reflections possibly associated with the potassic zone and the picrite unit located just below the bottom of the borehole.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".