impact of falling of ground in underground mines
TRANSCRIPT
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SEMINAR PRESENTATION
TOPIC:
ASSESSING THE IMPACT OF FALL OF GROUND IN
UNDERGROUND MINES
CASE STUDY: ANGLOGOLD ASHANTI, OBUASI MINE,
(SOUTH MINE).
by: Supervisor:
ROLANCE ABOAGYE FRIMPONG MR. E.M. BUABA
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OUTLINE OF PRESENTATION
Statement of the Problem
Objectives of the Project
Methods Used
Main Work
Observations
Conclusions
Recommendations
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STATEMENT OF THE PROBLEM
The mine produces about 395,000 tonnes of goldevery year.
The mine is divided into two main sections with
different blocks. These sections include; North Mine and South
Mine. The South Mine consists of GeorgeCarpendell Shaft (GCS) and Sansu Shaft. The North
Mine consists of Kwesi Mensah Shaft (KMS) andAdansi shaft.
The South section of the mine produces about60% of the total annual tonnage of the mine
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STATEMENT OF THE PROBLEM (contd)
Fall of ground remains one of the greatest hazards to
mine workers in AngloGold Ashanti (AGA) Obuasi
mine especially the South Mine.
This therefore necessitated the need to study itsimpact on the mine especially on production.
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OBJECTIVES OF THE PROJECT
To analyse the trend of fall of ground
To analyse the effect on production
To make appropriate recommendations to
reduce fall of ground
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METHODS USED
Review of relevant literature on fall ofground.
Acquisition of field data from AGA, Obuasimine.
Analysis of data acquired from the field.
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Fall of Ground (FoG) Accidents
Figure 1 FoG involving Scooptram machine
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Fall of Ground (FoG) Accidents (contd)
Figure 2 A FoG Incident Underground
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DATA ANALYSIS
Records of Fall of Ground (FoG)
0
1
2
3
4
5
6
Jan Feb Mar Apri May Jun Jul Aug Sep Oct Nov Dec
TotalFoG
Months
Fall of
Ground
(FoG)
Target
Figure 3 Total Fall of Ground (FoG) from January to December, 2009
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Record of FoG ( contd )
0
1
2
3
4
5
6
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
TotalFoG
Months
Fall of
Ground(FoG)
Target
Figure 4 Total Fall of Ground (FoG) from January to December, 2010
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Record of FoG ( contd )
0
0.5
1
1.5
2
2.5
3
3.5
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
TotalFoG
Months
Fall of
Ground
(FoG)
Target
Figure 5 Total Fall of Ground (FoG) from January to December, 2011
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INJURY RECORDS
0
0.5
1
1.5
2
2.5
Jan Feb Mar Apri May Jun Jul Aug Sep Oct Nov Dec
LostTimeInjuries(LTI)
Months
Lost TimeInjuries
(LTI)
Target
Figure 6 Total Lost Time Injuries from January to December, 2009
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INJURY RECORDS ( Contd )
0
0.5
1
1.5
2
2.5
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
TotalLostTimeInju
ries(LTI)
Months
Lost Time
Injuries
(LTI)
Target
Figure 7 Total Lost Time Injuries from January to December, 2010
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PRODUCTION IN STOPES WITH FALL
OF GROUND (FoG) INCIDENT
0
2000
4000
6000
8000
10000
12000
14000
Block 937 N 1
Sansu 218L
Sansu 218 N 1
Sansu 217 L
Sansu 323 L
Block8Upper
Block8Upper
21 N 1
Block8Upper
22 L
Block8Lower
30 N 1
Tonnageofore
Stopes
Budget
Achieved
Figure 9 Shows budget as against achieved tonnage of ore in stopes with FoG
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PRODUCTION IN STOPES WITHOUT
FALL OF GROUND (FoG) INCIDENT
0
5000
10000
15000
20000
25000
30000
Block 9
36L 9(283-276)
Block
8Lower32 N 2South
(333)
Block
8Lower30L
Block
8Lower30L
South
319
Block
8Upper23N 1South
315
Sansu 3
23 South183
Block
8Upper22 L N 1
South
Sansu 3
23LSouth
Sansu 2
20L N 1
Tonnage
ofore
Stopes
Budget
Achieved
Figure 10 shows budget as against achieved tonnage of ore in stopes without FoG
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IMPACT OF FoG ON THE MINE
PRODUCTION
Cost of operation
Dilution
Delay in mining
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OBSERVATIONS
The following observations were made during
the study and assessment;
There has been a decreasing trend of FoG
from 2009 to 2011.
Most of the support systems, particularly at
the areas of fall, were rusted.
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RECOMMENDATIONS
Workers should not be permitted to work in
areas that have not properly been scaled and
where no other forms of surface supportexist.
Mucking from the stope should be done withteleremote controlled scoops.
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THANK YOU !!!