The design, construction, instrumentation and initial response of a field-scale waste rock test pile
Notice bibliographique
Résumé
The geochemical and hydrological behavior of waste rock systems is usually predicted by conducting laboratory scale tests such as humidity cells and small-scale barrel tests. While these test procedures for the prediction of geochemical behavior are well developed and widely adopted in practice, little is known if the results obtained from these small scale tests can be used to describe and predict the full-scale behavior of waste rock impoundments under natural field conditions. Direct observations and measurements of water movement through waste rock dumps are necessary to improve the understanding of the hydrology of the dump and its influence on the geochemistry of full-scale waste rock dumps. These observations of oxygen and water movement are possible through the implementation of field-scale experiments. Some field-scale experiments have been developed in the last few decades; all of them focus primarily on studying waste rock geochemistry and hydrology in acid production environments. However, some ore bodies are hosted in rock with high neutralization capacity such as carbonates, generating alkaline/neutral drainage from the waste rock dumps. This type of drainage can also produce adverse effects on the environment. The alkaline/neutral drainage from waste rock dumps can limit the dissolution and mobility of some metals although other environmentally hazardous elements are not strongly attenuated at high pH. This thesis is part of an extensive research program currently undertaken by the University of British Columbia in Vancouver, Canada in collaboration with Teck Cominco Limited, the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Antamina mine in Peru to investigate waste rock hydrology and geochemistry in a neutral drainage environment. The field experimentation includes five field-scale waste rock test piles, a number of barrel-sized field cells and a cover study. The scope of this research involved the design, construction and instrumentation of a field-scale waste rock test pile constructed at the Antamina mine, which is hosted in rock with high ii neutralization capacity. The experimental data was used to analyze the initial hydrological and geochemical response of the constructed pile. The general conclusions are that: the test pile construction sequence and the meteorological conditions at the site during the construction and subsequent operation of the pile had a significant influence on the initial hydrological response of the test pile; the infiltration and drainage conditions in the test pile reached a semi-steady state in relatively short period of time; the effect of material segregation, heterogeneity and the presence of preferential flow paths appear to be evident; and, that the levels of electrical conductivity measured and the sulfates released along with concentrations of metals such as Cu and Zn suggests that oxidation is taking place within the pile.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,001 |
| Méta-épidémiologie (sens large) | 0,001 | 0,001 |
| Bibliométrie | 0,001 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,001 | 0,001 |
| Science ouverte | 0,002 | 0,001 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,007 | 0,006 |
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 source (Gemma direct ou Codex distillé), 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 ».