In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden.
Pillar support is the most common natural support system which is applied in most of the deep to utra-deep gold mines, as a way of preventing the fall of ground and maintain the stability of the rock mass. Deep level gold mines are currently operating at a depth of 2.7km to 4km from the ground...
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| Language: | English |
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2022
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| Online Access: | https://www.researchgate.net/publication/320551899_In-stope_pillar_scaling_and_fracturing_in_Southern_African_deep_level_gold_mines http://hdl.handle.net/11408/4955 |
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| author | Zvarivadza, T Sengani, F. Adoko, A.C. |
| author_facet | Zvarivadza, T Sengani, F. Adoko, A.C. |
| author_sort | Zvarivadza, T |
| collection | DSpace |
| description | Pillar support is the most common natural
support system which is applied in most of the deep to utra-deep
gold mines, as a way of preventing the fall of ground and
maintain the stability of the rock mass. Deep level gold mines
are currently operating at a depth of 2.7km to 4km from the
ground surface with the use of rectangular yield pillars, 6m
wide, 15m long and 5.5m high. In-stope pillar fracturing and
scaling is one of the common problems faced at deep level gold
mines. This paper investigates the general and technical
behavior of the in-stope pillar, taking into consideration;
fracture frequencies within the in-stope pillar, scaling of the in-
stope pillar, behavior of the in-stope pillar under different micro
seismic events and ground closure at the back areas and closer
to the stope faces. The investigation involves the analyses of in-
stope pillar fracturing, scaling and ground closure through the
use of underground monitoring instrumentation which includes;
borehole camera, extensometer, Electronic Monitoring Cable
Anchor Device (EMCD), Falls of Ground Light (FOG light) and
closure meters. Abaqus Explicit software was used to calculate
the ground closure and 1 along the boundaries of the in-stope
pillar. The results of the borehole camera indicated that most of
the in-stope pillars were adequately fractured to the core, but the
scaling of the pillar was found to be extensive in the back area
(30m and above, from the face), while occurring gradually
towards the face (10m and less to the face). The closure
monitoring systems indicated ground closure ranging from
10mm to 500mm. Based on the results calculated by the model,
the ground closure were found to range from 300mm to 600mm.
1 was found to range from 270MPa to 400MPa. The work
presented in this paper is part of a Masters of Science in Mining
Engineering by research at the University of Witwatersrand
Johannesburg, School of Mining Engineering. |
| format | Presentation |
| id | ir-11408-4955 |
| institution | My University |
| language | English |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ir-11408-49552022-07-08T08:05:23Z In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. Zvarivadza, T Sengani, F. Adoko, A.C. Pillar support pillar scaling pillar fracturing numerical modeling seismic events Pillar support is the most common natural support system which is applied in most of the deep to utra-deep gold mines, as a way of preventing the fall of ground and maintain the stability of the rock mass. Deep level gold mines are currently operating at a depth of 2.7km to 4km from the ground surface with the use of rectangular yield pillars, 6m wide, 15m long and 5.5m high. In-stope pillar fracturing and scaling is one of the common problems faced at deep level gold mines. This paper investigates the general and technical behavior of the in-stope pillar, taking into consideration; fracture frequencies within the in-stope pillar, scaling of the in- stope pillar, behavior of the in-stope pillar under different micro seismic events and ground closure at the back areas and closer to the stope faces. The investigation involves the analyses of in- stope pillar fracturing, scaling and ground closure through the use of underground monitoring instrumentation which includes; borehole camera, extensometer, Electronic Monitoring Cable Anchor Device (EMCD), Falls of Ground Light (FOG light) and closure meters. Abaqus Explicit software was used to calculate the ground closure and 1 along the boundaries of the in-stope pillar. The results of the borehole camera indicated that most of the in-stope pillars were adequately fractured to the core, but the scaling of the pillar was found to be extensive in the back area (30m and above, from the face), while occurring gradually towards the face (10m and less to the face). The closure monitoring systems indicated ground closure ranging from 10mm to 500mm. Based on the results calculated by the model, the ground closure were found to range from 300mm to 600mm. 1 was found to range from 270MPa to 400MPa. The work presented in this paper is part of a Masters of Science in Mining Engineering by research at the University of Witwatersrand Johannesburg, School of Mining Engineering. 2022-07-08T08:05:23Z 2022-07-08T08:05:23Z 2017 Presentation https://www.researchgate.net/publication/320551899_In-stope_pillar_scaling_and_fracturing_in_Southern_African_deep_level_gold_mines http://hdl.handle.net/11408/4955 en open |
| spellingShingle | Pillar support pillar scaling pillar fracturing numerical modeling seismic events Zvarivadza, T Sengani, F. Adoko, A.C. In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. |
| title | In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. |
| title_full | In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. |
| title_fullStr | In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. |
| title_full_unstemmed | In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. |
| title_short | In-stope pillar scaling and fracturing in Southern African deep level gold mines: 26th International Symposium on Mine Planning and Equipment Selection (MPES2017). 29 – 31 August 2017, Luleå, Sweden. |
| title_sort | in-stope pillar scaling and fracturing in southern african deep level gold mines: 26th international symposium on mine planning and equipment selection (mpes2017). 29 – 31 august 2017, luleå, sweden. |
| topic | Pillar support pillar scaling pillar fracturing numerical modeling seismic events |
| url | https://www.researchgate.net/publication/320551899_In-stope_pillar_scaling_and_fracturing_in_Southern_African_deep_level_gold_mines http://hdl.handle.net/11408/4955 |
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