The AurMac deposits: geology and mineralization controls of metasediment-hosted gold deposits in a reduced intrusion-related gold system district
Bibliographic record
Abstract
The AurMac property, located 35 km north of Mayo in central Yukon, includes two metasedimentary-hosted gold deposits: the 6158 koz Au Powerline deposit and the 845 koz Au Airstrip deposit. Gold mineralization occurs as sheeted quartz veins at Powerline and skarn horizons at Airstrip. The property straddles the Robert Service thrust fault, with Powerline hosted in the Late Proterozoic to Cambrian Hyland Group hanging wall, and Airstrip in the Mississippian Sourdough Hill Member of the Keno Hill Quartzite footwall. Host rocks are dominantly siliciclastic metasedimentary rocks and variably calc–silicate–altered calcareous metasedimentary rocks. The only igneous rocks in the property are foliated mafic horizons geochemically similar to regional Cambro-Ordovician magmatic rocks, and a south-dipping, mid-Cretaceous aplite dike at Airstrip. Although a causative intrusion has not been identified, Raman thermometry of carbonaceous material and geophysics suggest that the AurMac deposits lie within the thermal aureole of an intrusion interpreted to be northwest of the deposits. Gold mineralization at AurMac is similar to reduced intrusion-related gold systems, including sheeted veins and skarn, and Ag-Pb-Zn veins on the property shares similarities with veins in the Keno Hill silver district. Gangue minerals associated with mineralization are plastically deformed and suggest deformation likely related with the Tombstone strain zone occurred syn- to post-dating mineralization. Given the proposed magmatic-hydrothermal nature of mineralization at AurMac, this would imply that Cretaceous magmatism at AurMac was syn-kinematic, not necessarily postdating the end of convergence-related deformation. Implications of this study include the potential for undiscovered mineralized intrusions on the AurMac property and bulk-tonnage, sediment-hosted intrusion-related gold systems in the Tombstone Gold Belt, as well as a potential overlap in time between mineralization, deformation, and magmatism in the district.
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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 | 0.000 |
| Science and technology studies | 0.000 | 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".