scholarly journals The long post-closure period of a kaolin mine

2013 ◽  
Vol 66 (3) ◽  
pp. 363-368 ◽  
Author(s):  
Camila K. Conegundes de Jesus ◽  
Luis Enrique Sánchez
Keyword(s):  
Good Practice ◽  
Underground Water ◽  
Organizational Memory ◽  
Mine Planning ◽  
Contaminated Sites ◽  
Mine Closure ◽  
Sediment Control ◽  
Land Rehabilitation ◽  
Kaolin Mine ◽  
Document Review

Aiming at deriving good practice recommendations for mine closure, this paper reviews the case of a kaolin mine whose production ceased more than ten years ago, but as yet didn't meet its completion criteria. Document review, interviews and site visits showed that: (i) rework was needed to satisfactorily implement land rehabilitation measures such as contouring, slope stabilization, erosion and sediment control and revegetation; (ii) underground water quality was affected during mine operation, causing the mine to be included in the State contaminated sites register. Despite being a small operation, the closure of this mine illustrates a number of problems faced by mining companies in planning and implementing mine closure measures: (1) lack of clear land rehabilitation objectives; (2) the need to manage liabilities related to contaminated sites; (3) loss of organizational memory. The research found that good practices, generally recommended in guidebooks, were not adopted by the company. The main lesson from this relatively simple case - a small mine situated near a dynamic and expanding urban area - are that decommissioning and closure cannot be a makeshift add-on to mine management; these are not trivial activities and require careful planning and integration with mine planning itself.

Mine Planning and the Crucial Role of Geology

SEG Discovery ◽  
2019 ◽  
pp. 16-27
Author(s):  
Ed Holloway ◽  
Scott Cowie
Keyword(s):  
Best Practice ◽  
Corporate Strategy ◽  
Planning Process ◽  
Mineral Exploration ◽  
Mining Operation ◽  
Early Career ◽  
Mine Planning ◽  
Driver Model ◽  
Mine Closure ◽  
Mining Operations

Editor’s note: The Geology and Mining series, edited by Dan Wood and Jeffrey Hedenquist, is designed to introduce early-career professionals and students to a variety of topics in mineral exploration, development, and mining, in order to provide insight into the many ways in which geoscientists contribute to the mineral industry. Abstract Mine planning is the process that determines the way in which an ore deposit will be mined over the life of a mining operation. It necessarily draws on everything that planning engineers believe will determine the ultimate success of the proposed mine and uses as its foundation all of the geology-related data on the deposit. It is both a strategic and a tactical process that first considers a longer-term horizon based on strategic considerations, followed by more detailed shorter-term planning processes, in this order; the latter are the result of tactical considerations. This structured process may also be referred to as integrated mine planning, and it is driven by a broader corporate strategy or set of objectives. As such, it is much more than the mining engineering section of the mine development process. It has to include inputs from all related disciplines, by combining all of the measured properties of the deposit with mining-associated parameters. This results in the planning process incorporating a significant number of interrelated parameters. If these parameters are not used diligently and accurately or are not well aligned, or if the underlying data are deficient in either quantity or quality, the project or operation is unlikely to achieve its potential, by virtue of failures in the planning process. Best-practice integrated planning incorporates relevant inputs from all mining-related fields: geology, geotechnical, geochemical, hydrogeological, hydrology, mining operations, minerals processing, marketing of product, waste management, tailings, environmental, social science, mine closure, etc. It includes all interfaces in the business-value driver model, from exploration drill holes to the mine closure plan. The planning process cannot be completed successfully by mining engineers working in isolation from professionals in other key disciplines. Because geology provides the foundation on which the mine plan is built, the quality and accuracy of the geologic data provided to planning teams by exploration geoscientists is crucial.

scholarly journals Forecasting Underground Water Dynamics within the Technogenic Environment of a Mine Field: Case Study

2021 ◽  
Vol 13 (13) ◽  
pp. 7161
Author(s):  
Oleg Bazaluk ◽  
Ivan Sadovenko ◽  
Alina Zahrytsenko ◽  
Pavlo Saik ◽  
Vasyl Lozynskyi ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Rock Mass ◽  
Hydraulic Conductivity ◽  
Underground Water ◽  
Water Dynamics ◽  
Water Recovery ◽  
Mine Closure ◽  
Mine Field ◽  
Water Ingress ◽  
Roof Fall

The objective is to analyze the dynamics of the underground water of a mine field based on the study of the geofiltration process of the rock mass disturbed by mining to achieve safe extraction operations as well as subsurface territories at the stage of the mining enterprise closure. Numerical modeling, based on a finite difference method under the conditions of multifactority and definite uncertainty of processes of transformation of technogenic environment of a mine field, helps solve a problem concerning underground water dynamics forecasting. A hydrodynamic model of the M.I. Stashkov mine was developed while solving option series of epignosis problems in terms of the chronology of mine field stoping. The abovementioned made it possible to identify regularities of the history of filtration, the capacity parameters of rock mass and the expansion of areas of heightened hydraulic conductivity as well as to evaluate qualitatively the water balance components of a carbonic watered formation and an overlying one. The stage of mining closure helped obtain the forecasting hydrodynamic solutions. The efficiency of measures, concerning reduction of water ingress into mine workings and the mitigation of surface ecological effects of mine flooding was evaluated quantitatively. It was determined that implementation of the water control procedures makes it possible to perform a 10–38% decrease in water ingress. In this context, they may be applied both independently and simultaneously. In terms of mine closure and flooding, a period of complete underground water recovery takes three years; in the process, surface zones of potential waterlogging and swamping are developed within the floodplain of Samara River, located at the territory of Western Donbas (Ukraine). The scientific novelty is to define regularities of hydraulic conductivity transformation of the rock mass of a mine field starting from the mine working roof fall, up to its compaction during the mine operation period. To do that, nonstationary identification problems were solved, using numerical modeling. The abovementioned makes it possible to improve the reliability of hydrodynamic prognoses and develop technological schemes to control water at the state of the mine closure.

Redesigning Introduction to Communication Disorders

2010 ◽  
Vol 13 (2) ◽  
pp. 40-48 ◽  
Author(s):  
John Wm. Folkins
Keyword(s):  
Student Learning ◽  
Student Evaluation ◽  
Good Practice ◽  
Communication Disorders ◽  
Team Experience ◽  
Team Activity ◽  
Class Period ◽  
Written Assignments ◽  
Principles Of Good Practice ◽  
Overall Effectiveness

A class of 58 students in Introduction to Communication Disorders was divided into eight teams of approximately seven students each. The teams sat together all semester and participated in at least one team activity (team discussions, in-class written assignments, and team quizzes) in every class period. Teams also were used for taking roll and reviewing for examinations. There was no decline in student evaluation of the overall effectiveness of the course or in examination scores when compared to when this course was taught with half the number of students and no teams. Students evaluated the team experience highly and appeared to enjoy competition among teams. Using teams was successful in creating experiences that foster student learning as embodied in Chickering and Gameson’s principles of good practice.

Förderung der Lesekompetenz mittels reziproken Lehrens: Implementation und Wirksamkeit imRegelunterricht

2016 ◽  
Vol 30 (4) ◽  
pp. 213-225 ◽  
Author(s):  
Helvi Koch ◽  
Nadine Spörer
Keyword(s):  
Good Practice ◽  
Post Test

Zusammenfassung. Ziel war es, die Effektivität zweier Interventionen zur Förderung der Lesekompetenz von Fünftklässlern zu untersuchen. Beide Treatments wurden von Regellehrkräften implementiert. Die eine Intervention war das reziproke Lehren, welches um Selbstregulationsprozeduren angereichert wurde (RT+SRL). Die zweite war eine von Lehrkräften konzipierte lesestrategiebasierte Unterrichtseinheit (Good Practice, GP). Zusätzlich gab es eine No-Treatment-Kontrollgruppe (KG0). Insgesamt nahmen an der Studie N = 244 Schüler teil. Im Rahmen eines Pre-, Post-, Follow-Up-Test-Untersuchungsplans kamen standardisierte Leseverständnisaufgaben, selbstkonstruierte Lesestrategieaufgaben und eine Selbstwirksamkeitsskala zum Einsatz. Kontrastierende Einzelvergleichsanalysen ergaben, dass sich die Schüler der Treatmentbedingung RT+SRL im Vergleich zu den Schülern der Kontrollgruppe zum Post-Test signifikant stärker im Leseverständnis, in der Lesestrategieanwendung und in der Selbstwirksamkeit verbesserten. Gleiches galt für die Lesestrategieanwendung zum Follow-Up-Test. Schüler der Bedingung GP konnten im Vergleich zu KG0-Schülern weder zum Post- noch zum Follow-Up-Test vorteilige Ergebnisse in den drei Kriteriumsmaßen erzielen.

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