Volcanic, hydrothermal and structural controls on the nature and distribution of base and precious metals at the B26 project, Brouillan volcanic complex, Abitibi, Quebec
Bibliographic record
Abstract
The B26 project located in the northern Abitibi greenstone belt, a few kilometres south of the past producing Selbaie mine, consist of transposed, gold-rich chalcopyrite veins associated with porphyritic felsic volcanic rocks overlain by newly discovered lenses of semi-massive to massive, Zn-Ag-rich sulphide lenses higher up in the stratigraphy. Diffuse and remobilized Ag-rich zone are present in the hanging-wall rocks. The mineralized zones and host rocks have undergone major shortening, producing the steeply south-dipping S2 penetrative planar fabric. The mineralized zones have also been subjected to stretching, indicated by a well-developed 55-60° plunge towards the west on the schistosity. This deformation and the accompanying metamorphism are responsible for some remobilization. Although similar to other Archean volcanogenic massive sulphide deposits in terms of overall geometry, the B26 deposit is locally enriched in precious metals and shows a few unusual characteristics that suggest specific ore-forming conditions that may have played a role on the precious-metal budget and distribution.
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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 | 0.001 | 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) | 0.003 | 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".