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MPD811S - Mine Planning and Design 415 - 1st OPP - JUN 2023 |
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nAmI BI AunIVERSITY
OF SCIEn CE Ano TECHn OLOGY
FACULTY OF ENGINEERING AND BUILT ENVIRONMENT
DEPARTMENT OF CIVIL, MINING AND PROCESSENGINEERING
QUALIFICATION: BACHELOR OF ENGINEERING: MINING ENGINEERING
QUALIFICATION CODE: 08BMEG
COURSE CODE: MPD811S
SESSION: JUNE 2023
LEVEL: 8
COURSE NAME: MINE PLANNING AND DESIGN 415
PAPER: THEORY
DURATION: 3 HOURS
MARKS: 100
EXAMINER(S)
MODERATOR:
FIRST OPPORTUNITY QUESTION PAPER
Prof. H. Mischo
Dr. T. Tholana
INSTRUCTIONS
1. Answer all questions.
2. Read all the questions carefully before answering.
3. Marks for each question are indicated at the end of each question.
4. Please ensure that your writing is legible, neat and presentable.
PERMISSIBLE MATERIALS
1. Examination paper.
2. Calculator and appropriate stationery
THIS QUESTION PAPER CONSISTS OF 5 PAGES {Including this front page)
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You are the mine manager of a local fluorspar mine. You are currently operating 4 different
orebodies on your mine site as surface mining operations. Orebody A is the only high-grade
orebody and thus the ore coming from this orebody is required as a "sweetener" in order to
guarantee a continuous feed to the processing plant.
The surface mining operation on orebody A had to be stopped due to an extremely
unfavourable ore-to-waste-ratio. Now the company CEO asks you to investigate the
possibility to transform the surface mine on orebody A into an underground operation. Please
answer the following 10 Questions. More information is given at the attached papers, you can
use this papers to visualize your answer with sketches.
Given information about the deposit:
• Total ROM from all four orebodies is 120.000 t/a.
• Orebody A has to contribute 40.000 t/a from the future underground operation.
• For the future underground mine you have access to all existing mining services from
the ongoing surface mines (e.g. workshops, labs, electricians, mechanics, grade
controller, mine surveyor ...)
• Until now: extraction in surface mining.
• Surrounding rock Fenite (uniaxial strength 200 - 250 MPa}, host rock highly alterated
in a 2 m wide contact zone to the orebody
• Hydrothermal vein deposit, orebody A splits into three parallel ore veins (uniaxial
strength 20 - 50 M Pa)
• Thickness 1 - 20 m, dip 40 - 60 gon, CaF2-content 55 %
• Underground mine will be operated as one-shift operation with lOh/shift
• 250 Working days/ year
Question 1 [10 marks]
Describe your development plan for the underground mine, indicate the placement and
lineage of the surface openings in the attached drawings
Question 2 [10 marks]
Select an appropriate mining method und substantiate your decision
Question 3 [10 marks]
Name type and number of additionally required mobile mining equipment for the
underground operation Please give a payload range for your haulage machines
Question 4 [10 marks]
Compare diesel and battery driven mobile equipment. Substantiate your choice for the new
mine
Question 5 [10marks]
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Discussthe Pros and Cons for a backfill operation for this underground mine. Where is the
backfill material coming from. Dou you need cemented backfill?
Question 6 [lOmarks]
Describe your ventilation concept and indicate in the drawing. Where do place the main
mine fan? Please describe and show in the drawing
Question 7 [lOmarks]
Describe your concept for the supply/disposal of the underground mine with utilities and
water and indicate in the drawing
Question 8 [lOmarks]
Name all new staff positions you have to fill for the underground mine. Describe the
necessary competence levels for each position. Describe you staff recruitment strategy.
What is the minimum number of staff required to operate the underground mine
Question 9 [lOmarks]
Describe your Safety and Rescue Concept for the underground mine
Question 10 [lOmarks]
Summarize your suggestion to the company CEOif the mine should go/not go into an
underground operation for orebody A within three sentences
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Additional Notes
DEPOSIT: FLUORSPAR ORE A
3D-View (grid 50 m)
I
J700 L
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4
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Section view (grid 50 m)
1700 L
A
B
1650 L
1600 L
1550 L
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Given information about the deposit:
• Until now: extraction in surface mining.
• Surrounding rock Ferrite (strength 200 - 250 MPa)
• Hydrothermal vein deposit, orebody A splits into three parallel ore veins
(strength 20 - 50 MPa)
• Thickness 1 - 20 m, dip 40 - 60 gon, CaF2-content 55 %
5