Mitigation strategies for mining in high stress sill pillars at Coleman Mine – a case study
Bibliographic record
Abstract
Coleman Mine, a nickel/copper producing mine for Vale in the Sudbury mining district, is a mature mine that has been in continuous production since 1991. This maturity is reflected in the amount of ore that has been mined from several major ore zones and the number of associated sill pillars, many of which are being mined or are about to be mined. In the main nickel orebody one sill pillar is being mined and two more will start to be mined within the next year. In the main copper orebody three sill pillars are being mined with one more about to be mined. With sill pillars, and other diminishing pillars, there are problems with increased stress conditions that have the potential to lead to major seismic events prior to the complete failure of the pillar. This paper describes the different mitigation strategies that have been put in place at Coleman mine to minimise the risk of major ground instabilities caused by high stress conditions associated with sill pillars.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".