Abstract: Nature and distribution of copper mineralization in the Hinds Lake spillway, Howley area, central Newfoundland
Bibliographic record
Abstract
Greg Case1, Alexandre Zagorevski2, and Neil Rogers2 1. Department of Earth Sciences, Carleton University, Ottawa, ON, K1S 5B6 Canada ¶ 2. Geological Survey of Canada, 601 Booth Street, Ottawa, ON, K1A OE8 Canada Central Newfoundland contains a collage of Ordovician and Silurian arc and non-arc volcanic rocks that are host to numerous base metal (Cu-Pb-Zn) deposits, most notably the volcanogenic massive sulphide mineralization, such as in the Buchans Group. However, other types of mineralization also occur throughout the region, in a variety of different tectonic settings. This study is focused on an area of copper sulphide mineralization adjacent to the north-west side of Hinds Lake, which was uncovered during the construction of the Hinds Lake emergency spillway in 1980, but has not been studied in detail. The study area is underlain by volcano-sedimentary rocks that are presumed to be Silurian in age, which have been tilted and displaced by normal faults. The exposed stratigraphic sequence consists of columnar-jointed basalt, which is unconformably to disconformably overlain by a siltstone/shale sedimentary sequence and then polymictic conglomerate. The topmost unit present a series of thickly-bedded, columnar-jointed to massive, rhyolitic volcanoclastic rocks. Preliminary data indicate that the mineralization is both structurally and stratigraphically controlled. Mineralization is hosted by carbonate-quartz veins, with the Cu occurring predominantly within bornite, chalcopyrite and covellite. The mineralized veins have a strong preferred orientation and appear to be restricted to the upper portions of the columnar jointed basalt. As this horizon is only exposed within a section of the floor of the spillway, it is possible that the mineralized zone could extend laterally over a much larger aerial extent, buried beneath a felsic volcanic and sedimentary cover sequence only a few metres to tens of metres thick. Future work will include (i) a determination of the paragenesis of the sulphide mineralization and the associated alteration; (ii) the geochemical analysis of representative whole-rock samples from the volcanic rocks; and (iii) the integration of field, petrographic, and geochemical data to produce a unified model for Cu mineralization.
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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 | 0.002 | 0.002 |
| 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".