Design and management processes involved with extracting regional pillar stopes in a seismic setting at Darlot Gold Mine
Notice bibliographique
Résumé
This paper outlines the protocols introduced for the management of potential seismic risk, including monitoring, numerical modelling, extraction sequencing and the necessary support upgrades to mitigate the risks at Darlot Gold Mine. The Walters Lode is located 400 m below surface and uses a longhole mining method retreating back to a regional pillar. The lode is hosted within a strong dolerite host rock (uniaxial compressive strength (UCS) = 220 MPa+), with a UCS that often exceeds 200 MPa, with the main mineralised lode following along a structure called the first slip fault. This structure pinches and swells at varying depths and is usually identified by quartz intrusions and a 0.5-1.0 m sheared zoned along the plane. This fault dips at approximately 50° to the west. In addition to the first slip fault, there are multiple intersecting faults throughout the area. Originally the ground support for the development drives was not designed for seismic conditions and predominantly utilised resin bolts installed over fibrecrete. As the mining front began to retreat towards the pillar, mining induced stresses began acting upon the rock mass and the structures in the area. The rock mass response to these changes included an increase in seismic activity and deformation. This increased activity led to a review of the seismic management risk procedures at Darlot. Initial changes included upgrading the ground support regime to a yielding system capable of retaining the rock mass in response to predicted levels of seismicity. Expected levels of seismicity were obtained by undertaking a review of historical seismic data in the area. Non-linear elastic modelling was also undertaken to determine the potential seismic response and predicted damage to the rock mass based on the proposed extraction sequence. Based on these results, a geotechnically optimised stoping sequence was proposed. Internal numerical modelling has been conducted to account for newly found stope shapes relative to the original extraction sequence. The results that show potential depths of failure are used to strategically plan and account for additional overbreak or brow damage in the mining plan. Ongoing seismic monitoring and analysis is used to determine seismic exclusion zones and re-entry times. All of the above changes are used to continually calibrate the existing models, and ongoing data collection has resulted in an optimal extraction sequence, therefore allowing a safe and productive extraction of the Walters Lode.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».