The Archean Hammond Reef deposit: the formation of an orogenic gold deposit in a contractional step-over-zone along a major strike-slip fault system
Bibliographic record
Abstract
Hammond Reef is an orogenic gold deposit with a measured and indicated resource estimate of 3.3 Moz at an average grade of 0.84 g/t gold. It is located within the south-central region of the Wabigoon Subprovince in northwest Ontario. It is hosted within a system of north- to northeasttrending anastomosing shear zones, called the Marmion Shear System (MSS), which straddles the contact between the Mesoarchean Diversion stock to the west and Marmion Batholith to the east. Multiple shear sense indicators, including the deflection of mylonitic foliations in shear zones, drag folds, and shear bands, suggests that the MSS is a major sinistral transcurrent fault system. The bulk of gold mineralization is concentrated in an ENE-trending bend along the MSS, characterized by intense sericite and carbonate alteration. Mineralization formed between 2700- 2690 Ma and is associated with syn-tectonic hydrothermal quartz breccias and shallowly dipping quartz-carbonate veins with down-dip striations, which formed during bulk NNW-directed shortening across the bend. This suggests that the Hammond Reef deposit formed along a contractional step-over-zone between two regional sinistral transcurrent faults. Compression across the bend resulted in more fracturing that localized the migration of hydrothermal fluids and the precipitation and concentration of gold.
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 | 0.001 | 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) | 0.002 | 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".