The Pd deposits of the Lac des Iles Complex, Northwestern Ontario
Bibliographic record
Abstract
The Lac des Iles Complex contains the Roby, Twilight, and High-grade zones, which make up Canada’s only primary platinum-group element (PGE) ore deposit with a grade of ~3 ppm Pd + Pt. The ores have remarkably high Pd/Pt ratios, averaging 7 in the Roby and Twilight zones and even higher, 14, in the High-grade zone. In con-trast most PGE-dominated deposits have Pd/Pt ratios of 0.5 to 3. The Lac des Iles ore zones occur within a small (~2 ×y 3.5 km) concentrically zoned mafic intrusion and are approximately 0.5 km wide by 1 km long at surface. There are three major rock types present, gabbronorite, metagabbronorite, and chlorite-actinolite schist. The Roby and Twilight zones consist of magmatic breccia of gabbronorite or metagabbronorite, which contains pegmatoidal and varitextured patches. The gabbronorites have adcumulate textures and consist of deformed plagioclase and orthopyroxene with minor interstitial clinopyroxene, biotite, and hornblende. In the metagab-bronorites the pyroxenes and hornblende have been replaced by actinolite and the plagioclase has been partly altered to sericite. In the most altered metagabbronorites the plagioclase has been replaced by chlorite. The High-grade zone occurs between the breccia of the Roby zone and the homogeneous East Gabbro. The main rock type is actinolite-chlorite ± talc schist. Three sulfide assemblages are present: (1) pyrrhotite, pentlandite, chalcopyrite ± pyrite; (2) pentlandite,
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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 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| 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 | 0.000 |
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".