The Rainy River "atypical" Archean Au deposit, western Wabigoon Subprovince, Ontario
Bibliographic record
Abstract
The Rainy River project, located in the western Wabigoon Subprovince in western Ontario, is an advanced Au exploration project with an estimated 6.2 Moz Au and 14.6 Moz Ag in reserves and resources (New Gold Inc). The bulk of the Au and Ag mineralization occurs with pyrite, chalcopyrite, and sphalerite in disseminated } stockwork form, and part of the ore is within quartz-sulphide-tourmaline-carbonate veinlets that are subparallel to the main east-trending, south-dipping penetrative foliation (S2). Folded and transposed veins of quartz, Fe-carbonate, and tourmaline contain higher Au values, with Au in its native form or as electrum. At deposit-scale, there is a relatively good correlation between Au and Ag values, and between Au and Zn contents. Mineralization is concentrated in six zones that are elongated parallel to the main foliation. Higher grade zones are aligned within the main foliation plane along a stretching lineation (L2) plunging to the southwest. The deposit is hosted mainly within dacitic to rhyodacitic calc-alkaline volcanic domes, flows, and associated flow breccia. The rocks were regionally metamorphosed to greenschist facies. The proximal to immediate alteration consists of a sericite }Fe-carbonate overprinted to various degrees by chlorite. Manganiferous garnet, chloritoid, and kyanite are present locally, in proximity to, or within, mineralized zones. There is a strong correlation between the spatial distribution of the mineralization and the sericite-dominated alteration. Moreover, there is a direct correlation of stronger alteration intensity, higher-grade and/or more extensive mineralization, and host rocks of higher initial porosity (i.e. fragmental units), suggesting an early Au-Ag mineralization controlled by volcanism-related hydrothermal activity. Cross-cutting field relationships, preliminary laser-ablation inductively coupled plasma mass spectrometry analyses (LA-ICP-MS) of pyrite grains, and U/Pb ID-TIMS zircon geochronology further support the hypothesis of a synvolcanic origin for at least part of the Au mineralization. Subsequent deformation and metamorphism are responsible for transposition of the mineralized zones and metals within the main foliation plane and the associated stretching lineation, and for the modification of the primary alteration mineralogy to its greenschist-facies metamorphic equivalent.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.003 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.010 | 0.001 |
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".