Insights on the geology of the world-class Roberto Gold Deposit, Eleonore Property, James Bay, Quebec
Bibliographic record
Abstract
The world-class Roberto gold deposit is an atypical gold deposit located in an underexplored part of the Superior Province. The purpose of this paper is to present a preliminary geological description of deposit and provide insights on geological features that may have played a role in its formation and can be used to help exploration programs. The deposit is located within a km-scale F2 fold hinge that affects upper-greenschist to amphibolite-facies turbiditic metagreywacke and paragneiss. Gold mineralization is primarily confined to a series of sub-parallel decameter-scale-wide mineralized zones and is associated with an hydrothermal system characterized by calc-silicate veins and metasomatic replacement zones, potassic alteration, and tourmaline. The principal mineralized zone (Roberto) consists of a stockwork of quartz ± actinolite ± diopside ± biotite-arsenopyrite-pyrrhotite veins and quartz-dravite-arsenopyrite veinlets, contained within microcline (potassic alteration) and dravite replacement zones. While most of the alteration and mineralized zones are deformed by structures attributed to D2, some occurrences appear to be controlled by D2 structures; gold mineralization is thus interpreted as being pre- or early-D2. Although geochronological data allow to refute the hypothesis that Roberto (<2675 ± 6 Ma) is associated with the nearby Ell Lake diorite (2705 ± 1.9 Ma), the potential input from magmatic fluids should not be blindly discarded, as indicated by the presence of potentially younger porphyritic intrusions and multiple generations of pegmatites, some of which potentially being contemporaneous with a part of the mineralization or its remobilization.
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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 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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".