Deep Artesian Bore Drilling
Project Management, Licensing, Drilling, Pressure-cementing and Construction
The Impax Group have been operating an Atlas Copco Range III drill rig in western NSW for the majority of 20167-2017, using it to drill flowing artesian bores to depths of over 1000m. All aspects of the drilling program have been managed by The Impax Group, with a major component being arranging for licensing and approval for the bores involving correspondence with Water NSW. These bores have all been pressure cemented to depths of approximately 600m in order to ensure aquifer integrity, eliminate potential contamination and corrosion risks and in accordance with licensing requirements.
|Bore ID||Date||Bore Depth||Pressure Cementing||Flow|
|Fords Bride NSW||12/06/17||423m||0-339m||15L/s|
|Fords Bride NSW||28/04/17||432m||0-365m||15L/s|
|Fords Bride NSW||16/04/17||471m||0-379m||12L/s|
|Fords Bride NSW||04/04/17||476m||0-370m||22L/s|
|Fords Bride NSW||09/03/17||466m||0-388m||10 L/s|
|Tibooburra NSW||20/11/16||860m||0-550m||20 L/s|
|Tibooburra NSW||30/10/16||863m||0-550m||27 L/s|
|Tibooburra NSW||28/9/16||785m||0-403m||20 L/s|
|Tibooburra NSW||08/08/16||512m||0-400m||2 L/s|
Town Water Supply Hydrogeological Investigations
Project Management, Desktop Assessments, Drilling and Pump-testing
The Impax Group have been working on a variety of town water supply drilling projects for western NSW towns including Narromine, Trangie, Warren, Nevertire, Collie, Tooraweenah and Gulargambone. These projects were generally funded under the NSW Government Water Security for Regions program. As such, a number of Councils were awarded funding for the drilling and installation of bores, but had no real understanding of where to locate the bores, or how to best incorporate new bores into their existing town water supply network. The Impax Group engaged the services of Environmental Strategies (now Arcadis) to provide specialist hydrogeological services including desktop assessments, pump testing and reporting to our clients in Gilgandra, Narromine and Warren. The Impax Group conducted all of the required field work including test bore drilling, production bore drilling, developing and pump testing and reporting.
Gloucester Coal-seam Gas Monitoring Bore Drilling
Drilling, Development and Sub-Contractor (geophysical logger) Management
The Impax Group were awarded a tender issued by the NSW Government – Office of Water for the drilling of 14 coal seam gas monitoring bores near Gloucester NSW. These bores were drilled under the supervision of Office of Water Hydrogeologists to depths of up to 150m using the rotary mud drilling method, targeting narrow coal seam aquifers that were ultimately identified by way of both formation field logs and geophysical logging data. We were responsible for engaging the services of a Geophysical Logging sub-contractor (Weatherford) and managing logging operations so as to fit in with the drilling program. The Impax Group subsequently developed these bores by way of airlifting using our mobile bore development unit. All saline discharge water was captured for off-site disposal, and at the conclusion of the development works a representative water sample was collected and submitted for analysis.
Alkane Resources Hydrogeological Assessment
Project Management, Drilling, Pump Testing and Reporting
The Impax Group were engaged as Principal Contractors by Alkane Resources to explore the potential of the Upper Macquarie alluvium groundwater resource, and its suitability to provide production water for their nearby Toongi mining operation. The project involved a desktop hydrogeological assessment, a surface electro-magnetic TEM survey and test bore drilling for aquifer evaluation purposes. The Impax Group then completed multiple pump-tests and evaluated the data in order to provide recommendations for production bore drilling, which was subsequently drilled by a cable-tool drilling company under the supervision of The Impax Group.
Iluka Resources Eucla Basin South Australia
Monitoring Bore Drilling and Vibrating-wire Piezometer Installation
The Impax Group were contracted to work on a pre-feasibility study which involved monitoring bore drilling, geophysical logging and vibrating-wire piezometer installation. Data collected throughout this project was ultimately evaluated by Iluka Resources as part of their ongoing exploration and resource development program.
Shenuah Watermark Coal Exploration
Drilling, Core Collection, Decommissioning and Borehole Sealing
The Impax Group were engaged on a long term multiple rig coal exploration drilling program near Gunnedah NSW. Up to 3 rigs were in operation at the site at any one time, drilling to depths of 400m to 600m using HQ diamond core drilling. Core samples were collected and logged under the supervision of a geologist, and at the completion of drilling bores were sealed from bottom to top using cement grout placed via trammie pipe.
Iluka Resources Hydrogeological Investigation Balranald
Drilling, Geophysical Logging, Pump Testing and Well Injection
The project involved the drilling of a number of monitoring bores, production bores and injection bores as part of a feasibility study into dewatering the target aquifer for mining extraction purposes. The Impax Group also conducted 7-day continuous pumping/injection tests, where water was pumped from production bores through surface pipelines to injection bores up to 1,500m away. The water was then pumped down the inject bores and back into the aquifer, whilst adjacent monitoring bores were used to measure water levels in aquifers and the data ultimately interpreted to determine aquifer properties.
WA Government Department of Water
Monitoring Bore Drilling and Pressure Cementing
The Impax Group were awarded a contract by the Western Australian Government – Department of Water to drill and install 26 groundwater monitoring bores near Geraldton WA. The bores ranged in depth from 105m to over 350m and were drilled through challenging sand/gravel formations using the rotary mud drilling method. Due to both the depth of most of the bores and the highly saline upper aquifers the contract required the pressure cementing of the upper bore casing, typically to a depth of 150m to 200m. Pressure cementing was conducted by The Impax Group under the supervision of Department of Water Hydrogeologists, and involved the calculation of the correct amount of cement grout, grout mixing, conditioning and testing and the pumping of the grout down the bore holes under pressure using two cement plugs to separate the grout from the drilling fluid and follow on mud.
Victorian Government Goulburn-Murray Water
Monitoring Bore Drilling
The Impax Group were awarded the tender to drill and construct over 150 groundwater monitoring bores on behalf of the Victorian Government as part of their State Observation Bore Network within the Goulburn-Murray River Valleys. Bores were drilled and constructed over a 1 year period in both single and multiple aquifers, according to detailed contractual requirements under the supervision of hydrogeologists from Goulburn-Murray Water. In particular, great care had to be taken in placing both the gravel pack filter envelope and bentonite seals, and appropriately cementing the annular space behind the bore casing in order to preserve aquifer integrity and ensure the bore is fit for purpose. Safety and environmental management was also a major challenge throughout the project as the majority of bore sites were located on crown lands within road reserves, and thus the project required great attention to compliance requirements, management plans and mitigation measures.
Tomingley Gold Project Groundwater Assessment
Hydrogeological Impact Assessment and Reporting
The Impax Group were contracted to prepare a groundwater assessment for the proposed Tomingley Gold Open Cut project. The final report completed by The Impax Group included the identification and description of the groundwater resources at the site and what potential impact the proposed works may have on such resources. The report also outlined recommended mitigation measures and management plans that would need to be implemented to reduce impacts and protect the groundwater resource throughout mining activities.