Experience in Australia with the application of the Mathews method for open stope design
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
A significant open stope stability data base was developed for an Australian mine which is similar in size to the North American data base used to develop the Mathews' stability graph method. Sufficient case histories were developed to test the validity of using the two extant versions of the Mathews' method for predicting the stability of stope walls at the case study mine. Both gave similar predictions, despite different stability zonings and some differences in the way that the stability numbers are calculated. In general, the stope surfaces that were observed as unstable plotted well on both stability graphs. However, a significant percentage of stable stopes were predicted to be unstable and this percentage was much greater than that for the North American data base, indicating that the method gave more conservative predictions for this particular case study. The study indicated that the two versions of the Mathews' method may give reasonable first approximations to stope dimensions where local experience is lacking or has not been documented. Nevertheless, the development of site specific zones of stability improved the predictive capability of the technique. Case histories documented by the authors, which included stope surfaces with a hydraulic radius up to 55 m, were combined with the Canadian data base and a modified general Mathews' stability graph presented.A significant open stope stability data base was developed for an Australian mine which is similar in size to the North American data base used to develop the Mathews' stability graph method. Sufficient case histories were developed to test the validity of using the two extant versions of the Mathews' method for predicting the stability of stope walls at the case study mine. Both gave similar predictions, despite different stability zonings and some differences in the way that the stability numbers are calculated. In general, the stope surfaces that were observed as unstable plotted well on both stability graphs. However, a significant percentage of stable stopes were predicted to be unstable and this percentage was much greater than that for the North American data base, indicating that the method gave more conservative predictions for this particular case study. The study indicated that the two versions of the Mathews' method may give reasonable first approximations to stope dimensions where local experience is lacking or has not been documented. Nevertheless, the development of site specific zones of stability improved the predictive capability of the technique. Case histories documented by the authors, which included stope surfaces with a hydraulic radius up to 55 m, were combined with the Canadian data base and a modified general Mathews' stability graph presented.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.000 | 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 it