Ore mineralogy of Cu-PGE mineralized gabbros, Coldwell Alkaline Complex, Midcontinent rift: supporting databases, scanning electron microscope, and mineral chemistry
Bibliographic record
Abstract
In the Midcontinent rift-related Coldwell Alkaline Complex, a series of co-genetic gabbroic to ultramafic intrusions host Cu and Pd in the 97.4 Mt Marathon deposit (0.27% Cu, 0.75 ppm Pd, 0.23 ppm Pt, and 0.09 ppm Au) the 32.42 Mt Geordie Lake deposit (0.3 g/t Pd), and in numerous occurrences. This report presents a number of mineralogical databases that are the result of work undertaken to characterize the Cu-Pd mineralization of 4 gabbro-hosted ore zones within the Coldwell Alkaline Complex. More than 40 ore and host rock samples from Geordie Lake, Area 41, and the Marathon Main and W Horizon orebodies were included in the petrographic study of textures and mineral associations allowing for in situ characterization of minerals of interest. The database of the of twelve, 0.5 to 12 kg mineralized drillcore sample concentrates contain sample locations, more than 200,000 Scanning Electron Microscope (SEM) semi-quantitative mineral analyses, and SEM scans and images. Over 140,000 ore mineral grains from the three ore zones yielded more than 70 different ore minerals, of which at least five phases from the W Horizon orebody, Marathon deposit are unknown or unnamed. The electron microprobe mineral-chemical database lists more than 300 analyses for a range of precious metal minerals and unknowns, including Pd-Au-Ag-Cu, Pd-Ag-S, Pd-S, Pd-Ni-As, Pd-As-Sb, Pd-Te-As-Ge, Pd-Pb-Sn, Pd- Ag-Te, unknown Rh-rich and Rh-bearing pentlandite-like sulphides, Ru-Rh-As-S, and Cd-S phases from the PGE-enriched W Horizon orebody. The principal ore minerals that account for the Pd, Pt, Rh, and/or Ru metal budget of the Main and W Horizon orebodies, Marathon deposit and the Area 41 Cu-Pd mineralized zone are useful in discriminating high-value PGE exploitable 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 | 0.004 | 0.002 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| 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".