A WA parliamentary question addresses water usage and potential environmental impacts of BGC's granite mining operation at The Lakes. The Minister's response clarifies water management practices and addresses concerns about groundwater contamination.

AnsweredQoN 1318Legislative Council
Asked
18 April 2002
Portfolio
Environment and Heritage

QuestionView source ↗

BGC (AUSTRALIA) PTY LTD, OPEN-CUT MINING, THE LAKES
With regard to the previous questions and answers on 9 April 2002 and 17 April 2002 - questions without notice 1236 and 1303 - on the major open cut mining operation for granite extraction operated by BGC (Australia) Ltd at The Lakes, about 50 kilometres east of Perth - (1) What volumes of water are allocated to the crushing and screening operations under the terms of the licence relating to category 12 of the 1987 Environmental Protection Regulations and what volume of this water is then discharged on a seasonal and annual basis? (2) How and where is the water referred to in (1) disposed of? (3) Are there any storage or evaporation ponds on the site; and, if so, how many? (4) In relation to any storage ponds on site, will the minister provide a volumetric quantification of the total water storage capacity available at the surface and specify the individual location and sizes of these storage ponds? (5) Given that the mine is processing water and that the water will fill to the surface when mining has ceased, what measures are in place to prevent an influx of highly saline water into the ground water system of the public drinking water source area? Hon LJILJANNA RAVLICH

AnswerView source ↗

On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(1) What volumes of water are allocated to the crushing and screening operations under the terms of the licence relating to category 12 of the 1987 Environmental Protection Regulations and what volume of this water is then discharged on a seasonal and annual basis? (2) How and where is the water referred to in (1) disposed of? (3) Are there any storage or evaporation ponds on the site; and, if so, how many? (4) In relation to any storage ponds on site, will the minister provide a volumetric quantification of the total water storage capacity available at the surface and specify the individual location and sizes of these storage ponds? (5) Given that the mine is processing water and that the water will fill to the surface when mining has ceased, what measures are in place to prevent an influx of highly saline water into the ground water system of the public drinking water source area? Hon LJILJANNA RAVLICH replied: On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(2) How and where is the water referred to in (1) disposed of? (3) Are there any storage or evaporation ponds on the site; and, if so, how many? (4) In relation to any storage ponds on site, will the minister provide a volumetric quantification of the total water storage capacity available at the surface and specify the individual location and sizes of these storage ponds? (5) Given that the mine is processing water and that the water will fill to the surface when mining has ceased, what measures are in place to prevent an influx of highly saline water into the ground water system of the public drinking water source area? Hon LJILJANNA RAVLICH replied: On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(3) Are there any storage or evaporation ponds on the site; and, if so, how many? (4) In relation to any storage ponds on site, will the minister provide a volumetric quantification of the total water storage capacity available at the surface and specify the individual location and sizes of these storage ponds? (5) Given that the mine is processing water and that the water will fill to the surface when mining has ceased, what measures are in place to prevent an influx of highly saline water into the ground water system of the public drinking water source area? Hon LJILJANNA RAVLICH replied: On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(4) In relation to any storage ponds on site, will the minister provide a volumetric quantification of the total water storage capacity available at the surface and specify the individual location and sizes of these storage ponds? (5) Given that the mine is processing water and that the water will fill to the surface when mining has ceased, what measures are in place to prevent an influx of highly saline water into the ground water system of the public drinking water source area? Hon LJILJANNA RAVLICH replied: On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(5) Given that the mine is processing water and that the water will fill to the surface when mining has ceased, what measures are in place to prevent an influx of highly saline water into the ground water system of the public drinking water source area? Hon LJILJANNA RAVLICH replied: On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
Hon LJILJANNA RAVLICH replied: On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
On behalf of the Minister for the Environment and Heritage, I thank the member for some notice of this question. (1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(1) The Minister for the Environment and Heritage has been advised by the Water and Rivers Commission that the licence for this facility regulates any discharges from the facility. As such, no allocation of water to the crushing and screening operations is set out by the terms of the licence. A recent inspection of the facility also determined that no water was currently being discharged from the site. (2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(2) No water is currently being discharged from the site. (3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(3) There is one dedicated on-site water supply storage facility or dam. (4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(4) The total capacity for the water storage facility is not a requirement of the licence and the Department of Environmental Protection does not have details of this. The storage facility is located adjacent to the crushing and screening activities on the opposite side to the pit. (5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.
(5) The mine does not use the dam water for processing, its only use is for dust suppression. When mining has ceased, the dam will be filled with water up to the regional natural water table, which is not necessarily the ground surface, and is highly unlikely to have a significant impact on the fractured ground water system of the area. Currently the area is not within or upstream of a proclaimed public drinking water source area.

Explore WA Government Data

Search the full archive in the free dashboard, or query programmatically via API.

Explore more