Grade Uncertainty in Stope Design—Improving the Optimisation Process

2018 ◽  
pp. 573-589 ◽  
Author(s):  
N. Grieco ◽  
R. Dimitrakopoulos
Keyword(s):  
Grade Uncertainty ◽  
Stope Design

Developing and Implementing a Specifications Grading System in an Organic Chemistry Laboratory Course

2020 ◽  
Author(s):  
William J. Howitz ◽  
Kate J. McKnelly ◽  
Renee Link
Keyword(s):  
Organic Chemistry ◽  
Chemistry Laboratory ◽  
Grading System ◽  
Traditional Grading ◽  
Final Grade ◽  
Laboratory Courses ◽  
Lower Division ◽  
Collaborative Learning Environment ◽  
Organic Chemistry Laboratory ◽  
Grade Uncertainty

<p>Large, multi-section laboratory courses are particularly challenging when managing grading with as many as 35 teaching assistants (TAs). Traditional grading systems using point-based rubrics lead to significant variations in how individual TAs grade, which necessitates the use of curving across laboratory sections. Final grade uncertainty perpetuates student anxieties and disincentivizes a collaborative learning environment, so we adopted an alternative grading system, called specifications grading. In this system each student knows exactly what level of proficiency they must demonstrate to earn their desired course grade. Higher grades require demonstrating mastery of skills and content at defined higher levels. Each students’ grade is solely dependent on the work they produce rather than the performance of other students. We piloted specifications grading in the smaller, third quarter course of the lower division organic chemistry laboratory series held during a summer term. Open-ended questions were chosen to gather student and TA perceptions of the new grading system. TAs felt that the new grading system reduced the weekly grading time because it was less ambiguous. Responses from students about the nature of the grading system were mixed. Their perceptions indicate that initial buy-in and multiple reminders about the bigger picture of the grading system will be essential to the success of this grading system on a larger scale.</p>

The total open stope design approach (Part 1)

2020 ◽  
pp. 575-583
Author(s):  
J. Szymanski ◽  
A. Karami ◽  
S. Frimpong ◽  
L. Sudak
Keyword(s):  
Design Approach ◽  
Stope Design

scholarly journals Stope Design for Conservation of Mineral and Safety in Underground Manganese Mine – A Case Study of Munsar Mine of MOIL Limited

Helix ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 132-136
Author(s):  
Manekar G.G ◽  
Atulkar C.B ◽  
Sarkar S.K ◽  
Anil Singh Rajput
Keyword(s):  
Stope Design

Production Blast-Induced Vibrations in Longhole Open Stoping

2012 ◽  
pp. 160-170
Author(s):  
John Henning ◽  
Hani Mitri
Keyword(s):  
Mining Operation ◽  
Metal Mining ◽  
Blast Vibration ◽  
Zone Width ◽  
Blast Design ◽  
Design Practices ◽  
Powder Factor ◽  
Vibration Attenuation ◽  
Stope Design

This paper examines stope design approaches employed at a metal mining operation in Canada for extraction of transverse primary, transverse secondary, and longitudinal stopes. Variations in stope and slot design, blast design, and blast vibration attenuation are presented in detail. It is shown that the type of blasthole stoping technique employed varies according to stope sequence and ore zone width. Within this range of stopes, blasting design practices have been standardized in terms of drillhole diameter, powder factor, and the type and pattern of the explosives used.

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