Geology, structure and gold mineralization within the Porcupine-Destor Deformation Zone, Harker-Holloway gold camp, southwestern Abitibi Greenstone Belt, Canada
Bibliographic record
Abstract
The Harker-Holloway gold camp is located along the Porcupine-Destor Deformation Zone in the northern portions of Harker and Holloway Townships, Ontario. The gold camp is host to two operating gold mines, the Holloway and Holt-McDermott mines as well as several minor gold showings. The Holloway and Holt-McDermott deposits are located entirely within splays of the Porcupine-Destor Deformation Zones within meta-volcanic rocks of the Kidd-Munro and Kinojevis lithotectonic assemblages, respectively, and are separated by a narrow band of Timiskaming meta-sedimentary rocks. The rocks of the area form a steeply south dipping package within which rocks have been deformed associated with development of the Porcupine-Destor Deformation Zone. Within the Holloway mine, a polylithic breccia folded into the volcanic stratigraphy was dated at 2686.6 +/- 1.8 Ma. Meta-volcanic rocks which host the two deposits belong to a tholeiitic suite of rocks and can be separated into four distinct groups based on lithogeochemistry. Tholeiites all have flat lying REE profiles and can be grouped into Types I, II and III based on increasing normalized REE values and are interpreted to represent a fractional crystallization trend from a tholeiitic source magma. An additional trachytic meta-volcanic unit was identified in the Holt-McDermott mine and is characterized by an enriched LREE profile and is interpreted to have formed via fractional crystallization from tholeiitic magma. Several episodes of gold mineralization have been identified in the area. The first and most economically important gold mineralizing event (Au1) is associated with albite alteration (Ab) and pyrite mineralization (Py1). Primary gold mineralization (Au1) predates D1 deformation, and is confined to specific stratigraphic units bounded by zones of intense S1 foliation development. A second, volumetrically less important, gold mineralization (Au2) is located within haloes of subhorizontal quartz-carbonate veins which cross cut the S1 foliation. Secondary mineralization is associated with a sericite+carbonate alteration (Sr) and a second generation of pyrite mineralization (Py2) and is interpreted to be a remobilization of primary gold mineralization. A third, volumetrically minor, gold mineralization event (Au3) is associated with N to NNE striking quartz veins which cross cut all other structures. (Abstract shortened by UMI.)
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 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".