Primary and secondary ore textures in the West Ansil volcanic-hosted massive-sulphide deposit, Noranda mining camp, Rouyn-Noranda, Quebec
Bibliographic record
Abstract
The West Ansil deposit is the fi rst copper discovery in 25 years in the Noranda central camp. It has a combined indicated and inferred resource of about 1.2 Mt. Grades for the indicated resource are 3.4% Cu, 0.4% Zn, 1.4 g/t Au, and 9.2 g/t Ag. Locally, gold grades are up to 10 ppm within massive chalcopyrite ore, which is signifi cantly higher than other central camp deposits (e.g. Corbet). The bulk of the resource is located in three massive-sulphide lenses (upper, middle, and lower) that are hosted in the Rusty Ridge unit above the Lewis exhalite. The Lewis exhalite is a key marker that is also related to the nearby Ansil mine (1.58 Mt, 8.03% Cu, 0.09% Zn) about 1.8 km northeast of the West Ansil deposit. The overall distribution of massive-sulphide ore and stringer zones at the West Ansil deposit suggests either stacking of separate lenses or dissection of a single deposit by late-stage faulting and dyke formation. The mineralization in all three ore lenses consists of massive pyrrhotite+chalcopyrite±magnetite. Semimassive sphalerite is restricted to the upper and lower parts of the middle lens. Massive magnetite occurs in the upper and middle lenses, where it replaces massive pyrrhotite. A striking feature of the West Ansil deposit is the presence of abundant colloform and nodular pyrite (±marcasite) in the massive-sulphide deposits, especially at the top and bottom of the main massive-sulphide lens. The colloform pyrite is interpreted to be a product of supergene alteration of pyrrhotite. This alteration may be related to shearing at the contacts of the lenses that allowed penetration of groundwater into the massive-sulphide deposits.
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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 | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
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".