The Tli Kwi Cho kimberlite complex, Northwest Territories, Canada: A geophysical case study
Bibliographic record
Abstract
The diamondiferous Tli Kwi Cho kimberlite complex is located about 360 km NE of Yellowknife, NT, Canada in the Lac de Gras kimberlite cluster of the Archean Slave Craton. Tli Kwi Cho consists of paired geophysical anomalies, DO18 and DO27 identified in a late‐1992 helicopter‐borne magnetic and EM survey, and was first intersected by drilling in March 1993. From the initial airborne survey, both DO18 and DO27 show coincident EM and magnetic anomalies. Subsequent to the initial 1992 survey, continued geophysical exploration included two other generations of helicopter‐borne magnetic and EM surveys, as well as ground‐based magnetic, HLEM, TEM, gravity and VLF surveys. Modeling was performed on the data; for the magnetic results, both 2.5D forward and 3D inverse models were calculated and 1D inversion was performed on the EM data. This work yielded insights into the nature of the kimberlites, and was very useful in helping to delineate the edges of the intrusive complex due to the presence of both non‐magnetic and non‐conductive kimberlite phases. Although a >4200 tonne bulk‐sample collected in 1994 showed that the Tli Kwi Cho kimberlites contain significant amounts of diamond (0.36carats/tonne), the occurrence was deemed uneconomic primarily owing to the low value of the stones recovered (US$21.70 in 1994) from an underground bulk sample.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".