Late Jurassic fault-hosted gold mineralization of the Golden Saddle deposit, White Gold district, Yukon Territory
Bibliographic record
Abstract
The Golden Saddle deposit is a lithologically and structurally controlled gold deposit located in west-central Yukon Territory. The deposit is located near the Klondike district, which is best known for its rich history of placer gold mining. The discovery of the Golden Saddle deposit in 2008 was the first significant lode gold discovery in this region. Based upon the geology, structure, and age of the deposit, an amagmatic orogenic model is proposed to describe the genesis of the deposit. The deposit area is underlain by Late Paleozoic amphibolite-grade metasiliciclastic, metavolcanic, metavolcaniclastic and metaplutonic rocks of the Yukon-Tanana terrane. Mineralization occurs at the intersection between a Jurassic east-striking sinistral transpressional fault system and an older north-striking thrust fault. Metavolcanic and metaplutonic rocks occur in the hanging wall of this thrust fault, whereas metasiliciclastic rocks occur in the footwall. Economic gold mineralization is hosted predominantly by a series of subparallel northeast-striking, northwest-dipping faults within the sinistral transpressional fault system. The gold-hosting faults are complex structures comprising early folds and shears that are crosscut by polyphase quartz-carbonate-sulphide veins, fracture zones, and breccias. Gold and related alteration minerals typically occur in brittle, dilational deformation zones. Some gold-bearing brittle deformation zones are oriented parallel to the fold-axial plane of ductile folds. This textural relationship is indicative of gold mineralization occurring near the brittle-ductile transition. Gold mineralization is accompanied by a progression of alteration mineral assemblages, vein mineral assemblages, and vein textures. Pre-gold alteration and veins vary by host rock composition, whereas syn-gold alteration and veins are characterized by quartz-carbonate-illite and gold-bearing pyrite. Mineralization is accompanied by enrichment of Au-Ag-Pb-S-Te, with enrichment of other elements dependent upon host rock composition, and variably including As, Ba, Bi, Cu, Hg, Mo, Sb, Se, and Zn. Values of δ³⁴S for hydrothermal pyrite range from –9.8 to 6.8‰, whereas ratios of ²⁰⁸Pb/²⁰⁶Pb and ²⁰⁷Pb/ ²⁰⁶Pb range from 2.043-1.933 and 0.828-0.757, respectively. These sulphur and lead isotopic ratios are interpreted to vary in part based upon host rock composition. The age of mineralization is constrained by ¹⁸⁷Re/¹⁸⁷Os model ages of 163–155 Ma for molybdenite in gold-bearing veins within the deposit.
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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 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| 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".