Stratigraphic and Structural Setting of the Hemlo Gold Deposit, Ontario, Canada
Bibliographic record
Abstract
Results of detailed surface and underground mapping and a compilation of data from the three gold mines in the Hemlo area, Ontario, are presented. In particular, the lithostratigraphy of the area is established, the nature of the lithologic units spatially closely associated with the ore and the protolith of the ore are determined, and the deformation history and the three-dimensional geometry of the area are elucidated. The genesis of the gold deposit is discussed in context of these results. Four generations (G 1 to G 4 ) of ductile structures, as well as brittle faulting, are recognized. G 2 deformation is the strongest and the geometry of the Hemlo camp is dominated by macroscopic (camp-scale) S-shaped F 2 folds. The two ore zones at Hemlo, the main and lower ore zones, are spatially associated with the two limbs of a newly recognized camp-scale F 2 fold, the Moose Lake fold, and the orebody is folded by F 2 at outcrop scale, mine scale, and possibly camp scale. G 2 deformation is most intense in the Hemlo shear zone, interpreted to be a sinistral transpressional zone. The Hemlo gold deposit is hosted in the shear zone, mainly in the segment that trends east-southeasterly where deformation is stronger. The main gold mineralization at Hemlo occurred before G 2 or early during G 2 deformation and before peak metamorphism. The latter took place during late G 2 to after G 2 deformation. The ore and alteration zones are dominantly, but not exclusively, spatially associated with the stratigraphically lower contact of a volcanic quartz ± feldspar porphyry (the Moose Lake porphyry). A mafic unit (altered felsic fragmental rock) and a barite horizon are spatially closely associated with the ore zones. The protolith of the ore is mainly the fragmental rock and the barite. The stratigraphically lower contact of the Moose Lake porphyry and the fragmental rock at the contact probably served as mechanical traps and the barite horizon as a chemical trap.
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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 | 0.003 |
| Science and technology studies | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| 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".