Post-closure investigation of engineered test covers on acid-generating waste rock at Whistle Mine, Ontario
Bibliographic record
Abstract
Three engineered test covers were installed at the Whistle Mine test site, near Capreol, Ontario, and monitored over 4 years. Each cover was a two-layer system consisting of a 0.90 m noncompacted gravelly sand overlying a barrier layer and a 6.10 m waste rock platform. The barriers consisted of a 92% sand – 8% bentonite mixture, a sandy silt, and a geosynthetic clay liner (GCL). A control plot (waste rock without cover) was also monitored. Water percolation through the covers was 61% for the sandy silt cover, 24% for the sand–bentonite mixture, 12% for the GCL, and 58% for the control. Post-monitoring excavation and examination of the test plots indicated that defects in the placement of the barrier layers, coupled with freeze–thaw effects, likely contributed to the unexpected high water percolation values observed. The results suggest that lapses in construction of soil barriers, such as lack of proper installation and quality control, can compromise cover effectiveness.Key words: mine waste, remediation, soil covers, post closure, investigations, water balance.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".