Neoproterozoic-hosted Carlin-type mineralization in central Yukon, part 2: mineralization
Bibliographic record
Abstract
Gold-rich zones in the Nadaleen trend (central Yukon) exhibit several characteristics consistent with Carlin-type mineralization: 1) alteration zones with partial to complete decalcification of mineralized intervals and very fine-grained quartz associated with silicification; 2) the association of gold with certain pathfinder elements (Tl, As, Hg, and Sb) and minerals (realgar, orpiment, and fluorite); 3) the low base metal and Ag content of the mineralized intervals; and 4) the 'invisible' nature of gold, which occurs as rims of Au-bearing arsenian pyrite on pre-ore pyrite and/or as sub-micrometre particles. Mineralization styles vary significantly between intervals and even within an interval, attesting to the 'passive' or 'opportunistic' nature of the mineralizing fluids that exploited a variety of porous and permeable pathways regardless of their sedimentary and/or tectonic origin. Alternating finely laminated limestone and siltstone (Conrad zone) and floatstone intervals (Conrad, Sunrise, and Osiris zones) are the most favourable sedimentary units. Pre-mineralization fractures acted as feeders for selective bed replacement and pre-mineralization vein networks were preferentially dissolved by early acidic fluids and channelized later by gold-bearing fluids. With ongoing research, we hope to better constrain the occurrence of gold at the micron scale, the geochemical variations due to alteration, the temperature of the mineralizing fluids, and the timing of the gold mineralization.
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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 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".