Structural and lithological controls on the nature and distribution of gold at the Tiriganiaq deposit, Meliadine district, Rankin Inlet Greenstone Belt, Nunavut
Bibliographic record
Abstract
The Archean Meliadine gold district, Rankin Inlet greenstone belt, Nunavut, contains numerous gold deposits and prospects that are spatially associated with the crustal-scale Pyke Fault and its splays. Many of these deposits are partially to dominantly hosted within banded iron formation (BIF), including at the Tiriganiaq mine where gold is hosted in complexly folded and sheared BIF-associated zones. The Tiriganiaq deposit is hosted in the structural hanging wall of the Lower Fault, a west-trending splay of the Pyke Fault located further to the south. The Lower Fault marks a break between the footwall mafic volcanic-dominated sequence (south) and a turbiditic dominated sequence in the hanging wall (north). The hanging wall units host the ore-bearing, decimetre- to metre-wide laminated quartz-ankerite shear vein referred to as the 1000 lode. A large part of the ore at Tiriganiaq is hosted within the Upper Oxide Formation, a package of iron-rich sedimentary rocks and BIF units. The southernmost ore zone (1100 lode) consists of a geometrically planar mineralized corridor associated with the transposed long limb of the folded BIF. The more geometrically and structurally complex 1150 and 1250 lode series are controlled by Lower Fault-parallel, narrow, north-dipping, reverse shear zones that overprint the slightly steeper, north-dipping S2 foliation that is axial planar to tight F2 folds. Shallowly south-dipping extension-al veins, associated with the shear zones and related fault-fill veins, are preferentially developed in tightly folded decimetre- to metre-thick BIF layers around the moderately north-dipping reverse shear zones.
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".