Structural Setting of Argentiferous Veins, Cariboo Gold District, East-Central British Columbia
Bibliographic record
Abstract
The Cariboo Gold District (CGD) in east-central British Columbia is a hotbed for gold exploration and production. The Cariboo gold rush began in the late 1850s with the discovery of placer-gold in streams near Likely and the Wells-Barkerville area, and lode-gold was discovered not long after. To date, the CGD has yielded an estimated 118 - 134 tonnes of gold (Levson and Giles, 1993). Although structural controls appear to be similar throughout the CGD, not all mineralized veins are gold-bearing. Silver Mine, Penny Creek, and Cariboo Hudson are three veins in a cluster of argentiferous quartz veins, located 23 km southeast of Barkerville Gold Mines’ Cow Mountain deposit; these veins are dominated by silver, copper, lead, zinc and tungsten minerals with little to no gold mineralization. The Silver Mine vein is the best-exposed vein in the cluster and is the focal point of this study. The Silver Mine vein is a 2 m wide, steeply-dipping, north-northeast striking, fault-filling Ag-W polymetallic quartz-carbonate vein hosted within the Hardscrabble Mountain succession of the Barkerville subterrane. Structural analysis of the Silver Mine and surrounding veins suggest it may be a ‘strike vein’, similar to the B.C. Vein situated 23 km northwest. The Silver Mine vein may have formed by exploiting a preexisting thrust fault and, under sustained northeast-directed regional shortening, gradually rotating and continuously reactivating an area of rheological contrast at a high angle to the inferred direction of maximum regional stress. Relatively fresh lamprophyre dikes, some containing xenoliths of quartz vein fragments, intrude close to and cross-cut the vein at Silver Mine; Ar⁴⁰/Ar³⁹ geochronology confirms that these intrusions are ~20 Mya younger than the vein. The Au-Ag-Pb-Zn ± Cu-W tenor of Silver Mine and nearby veins is distinct from the Au ± Pb-Bi tenor of ore in veins in the Wells-Barkerville camp. Many of the Ag-W polymetallic veins are located within, or very near to, the relatively more carbonaceous and fissile Hardscrabble Mountain Succession, whereas Au veins tend to be hosted by the Downey Succession. Host rock lithology may be an important factor in vein ore mineralogy.
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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 | 0.004 |
| Science and technology studies | 0.004 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".