Boral Quarries Seacliff Park (Linwood)
Seacliff Park SA 5049
The Boral Linwood Quarry, positioned within one of Adelaide and South Australia's most important sources of hard rock, has been providing aggregates for almost 130 years.
Situated in the coastal southern suburbs, the quarry has been identified as a critical and strategic resource given it supports building and construction across the Adelaide metropolitan area.
The quarry has also been recognised as a model of best practice for the extractive industry in South Australia, having achieved several awards for its operations.
In addition to the quarry and its processing plant, the site also hosts Boral Marino Concrete, part of Boral's network of concrete plants servicing the city.
About Boral Linwood Quarry
The Boral Linwood Quarry is located between Marino and Hallett Cove, not far from the shore of the Gulf of St Vincent, in Adelaide's southern suburbs.
Quarrying first began in 1882 to provide raw material (limestone) to the nearby Brighton Cement Works. By 1892, this operation had become The South Australian Portland Cement Company Limited.
In 1956, Quarry Industries Ltd took over operations at Linwood. This company was in turn purchased by Boral, with Linwood becoming part of the portfolio in 1994.
During Boral's stewardship, the focus for the operation has been the production of high quality road-base aggregates.
The Linwood site incorporates landholdings which are both owned by Boral, and leased from other landowners in return for royalties. A number of 'private mines' and small extractive mineral leases allow quarrying on these lands.
The quarry is bordered by the City of Marion Golf Club to the north east, itself having been formed on the original South Australian Portland Cement Company workings.
Vacant 'hills face zone' land exists to the east and southeast of the quarry as bounded by Ocean Boulevard and Perry Barr Road.
Today the Boral Linwood Quarry employs 30 full time staff and provides work for up to 80 contractors and transport workers. Many employees reside in the City of Marion within which the quarry is located.
During 2015, the quarry was identified as a 'strategic mineral resource' through the Resource Management and Planning (RAMP) report prepared for the South Australian Government.
It has also been acknowledged by industry for its leading practices, receiving two Industry of Quarrying Australia (IQA) recognitions in 2015, and one in 2012 from Cement Concrete Aggregates Australia (CCAA).
About Boral Marino Concrete
Boral Marino Concrete is one of five concrete batching plants operated by the company across Adelaide. It is sited within the Boral Linwood Quarry which supplies the plant with aggregates for production.
The plant produces pre-mixed concrete for commercial and residential projects throughout southern Adelaide and the city centre. The concrete is transported via Boral and contractor-owned 'agitators' (trucks).
Presently the plant employs three staff and two transport drivers.
Planning & Approvals
Here, you will find information about the approvals and conditions to which the Boral Linwood Quarry operates.
You can find details on any current planning applications and major projects for both operations below:
Reaching east - Linwood's future (Feb 2018)
Throughout 2017 and continuing into 2018, Boral continued to work to better inform local residents and stakeholders about the quarry and the direction it will take during the next decade. Of the various issues raised, the most critical is the commencement of planning to transition the site's operations from their current southward focus towards available rock resource to the east.We expect these plans to be finalised by the end of 2018. You can read more about our project to 'reach east' below.
The east - a new beginning for the Boral Linwood Quarry
As the resources in the southern part of Boral's land have been removed during recent years, planning was commenced for the next stage of the Linwood Quarry's life.
With no opportunities existing in the north and west, the development of the quarry into land on the eastern side of the existing pit became the primary focus. Boral accordingly worked over several years to secure ownership of, or lease arrangements for, this land ahead of the necessary planning approval processes.These arrangements are now largely finalised, enabling Boral to proceed with the relevant planning requirements. It is estimated there is up to 100 years' worth of resources within the potential eastern footprint. Much of this land is covered by an existing 'private mine', however, there is a significant part which has not been included in the quarry's lease before.
Gaining approval to quarry in the east
There is a detailed process which Boral will need to follow before any extractive activity can take place in the eastern portion:
- A full risk assessment must be conducted.
- Plans and an associated proposal document must be prepared.
- A mineral claim must be pegged and registered for the part of the land not covered by the private mines.
- A mining proposal must then be submitted.
- An application for an Extractive Mineral Lease (EML) can then be made.
- Once the EML is obtained, a Program for Environmental Protection and Rehabilitation (PEPR) must be developed.
Both the EML and the PEPR must be approved before any quarrying is able to take place. The environmental outputs which are common with quarries, such as dust emissions, blast vibrations and noise generation, must be identified at the 'mining proposal' stage. The proposal has to be able to address each of these issues by including suitable outcomes to be achieved while quarrying. With the full support of the community, Boral expects to be able to achieve approval for quarrying the eastern lands by 2019. You can view the concept plan for the pit design here. Please note that this is a concept plan only, and is not finalised nor approved by the regulatory authorities.
We have recently received approval from the Department of the Premier and Cabinet for our Exploration Program for Environment Protection and Rehabilitation (EPEPR), in January 2018. This EPEPR outlines how we will explore the lands to the east to understand its geological structure. Our consultant will request to do this via the drilling of ‘exploration’ and ‘seed’ holes. Understanding what was experienced late 2016, this process will be undertaken with extra guidance and caution by our team. We will consult with our neighbours, and give adequate notice of when any test blasts are due to occur. These activities can only occur with DPC approval of the EPEPR. As this application was successful, both the exploration and seed hole drilling occurred February 14, 2018. You can view the drill hole plan here.
Accessing a new direction (Feb 2018)
Another issue which has been of interest to the local community is a proposal to relocate the quarry's main access road.
The proposal has arisen as a result of lengthy negotiations between Boral and the owners of a parcel of land to the north of the quarry, known locally as 'Cement Hill'.
The road - moving our access away from Marino and Seacliff
Most local residents are aware that access to the Boral Linwood Quarry is via Clubhouse Road, off Ocean Boulevard in Seacliff.
Adjoining our access road is a site known variously as the 'Lorenzin' land or 'Cement Hill'. This land has been unused for many years with the old buildings upon it having fallen into disrepair. The owners of the site, Adelaide development firm Gasparin, have held a long-standing desire to see this land developed into a housing estate.
Unfortunately, while Boral would like to see the site being put back into use, establishing housing would introduce a conflict with our right to conduct our business.
The conflict arises from the potential amenity issues new residents would experience as a result of living next to the quarry traffic and the operations. There would also be an increased safety risk to consider.
Through various discussions, the idea of moving the quarry's access from its present location to a new one further to the south arose. As of February 2018, the process to relocate the Linwood Quarry access road from Clubhouse Road is well underway, with the Majors Road intersection selected as the preferred option. Consultants have been engaged to deliver a Department of Planning Transport and Infrastructure (DPTI) approved design for the haul road and the Majors Road intersection. An initial ‘in principle’ design has been tested and adjusted and is now with DPTI for further approvals. You can view the concept design for the road here. Please note that this design is a concept only, and not a final approved design. Time frames are subject to regulatory approvals; however, the intention is to have works completed by the end of 2018. We will continue to keep you updated on the progress of this project.
Mining Tenements - SA Mining Act 1971
The Boral Linwood Quarry site occupies just over 208 hectares of land. Around 36 percent of this is owned by Boral, with the remainder leased for quarrying from other landowners. The present quarry pit runs diagonally from the north-east to the south-west within the landholdings. Under the Act, quarrying is permitted via three 'private mines' (PM 3, 4 and 22) and three extractive mineral licences (5730, 5731 and 5732). Boral also has an active mineral claim (3314) and a Miscellaneous Purposes Lease (T02396) over other parts of the landholding. Extractive activities at the quarry are managed to a Mine Operations Plan as approved by the State Government in 2008. You can review the MOP documentation below.
- Boral Linwood Quarry - Mine Operating Plan 2008 - PART 1
- Boral Linwood Quarry - Mine Operating Plan 2008 - PART 2
- Boral Linwood Quarry - Mine Operating Plan 2008 - PART 3
- Boral Linwood Quarry - Mine Operating Plan 2008 - PART 4
During 2016, Boral applied for a minor amendment to the MOP in order to include the additional resource in the southern part of the existing quarry pit. The variation, which was supported by the required risk assessment, was approved by the SA Department of State Development in December. You can view the approved risk assessment documentation here. Works to prepare the amended area for quarrying began during March 2017 including pegging of a new extraction line and erection of a new fenceline.
Neighbouring residents were notified of the amendment works via letter.
Boral Marino Concrete - approvals
The Marino Concrete plant is operated on 'existing use' rights given that it is sited within one of the 'Private Mines' and is considered an 'ancillary' use to the quarry.
General planning context of the quarry precinct.
The quarry lies predominantly within the 'Hills Face Zone' and 'Extractive Industry Zone' defined in the City of Marion Development Plan. The northwestern part of the site is bounded by established residential development (Marino), with undeveloped residential and hills face zone land adjoining the remainder of the western boundary.
Resources & Products
The Boral Linwood Quarry is a 'hard rock' site from which aggregates are produced. These aggregates form the base of building and construction materials such as concrete and asphalt.
Mawson and Sprigg (1950) established the area around the Boral Linwood Quarry as the 'type section' for the upper part of the 'Adelaide System'.
They reported a total thickness of 30 metres for the Brighton limestone that was overlain by the chocolate slates of the Marinoan series, and underlain by the Tapley Hill formation with 'slaty limestones at the top'.
The quarry was also given as the 'type section' for Brighton limestone. Nixon (1957) mapped and sampled the quarry and reported on the potential available resource.
Further work was undertaken by AM Pain in 1969 and is recorded in the Department of Mines Mineral Resources Review 131.
The main products of the Boral Linwood Quarry are:
- asphalt and road-sealing aggregates;
- concrete aggregates; and
- roadbase materials.
The Boral Linwood Quarry is worked continuously throughout the year, with an annual sales output of between 750 000 and 1 million tonnes of material.
In order to supply the Adelaide market, a number of activities are undertaken a the site in common with other extractive operations. These are:
- Stripping - the removal of 'overburden' (soil, sub-soil and other material which sits on top of the hard rock resource);
- Drilling and blasting - use of controlled implosions to expose the hard rock for processing;
- Loading and hauling - transfer of rock to the processing plant;
- Crushing and screening - to produce the various grades of aggregate;
- Stockpiling, sales and transportation - storage and movement of products to market; and
- Maintenance - on the plant, equipment and vehicles.
The current crushing plant was built in 1987 and has a capacity of 280 tonnes per hour.
Hours of operation
The Boral Linwood Quarry normally operates from 6.30am to 5pm Monday to Saturday. The site is not normally worked on Sundays or public holidays.
Truck movements on the site can continue out of hours, with cement deliveries to the Boral Marino Concrete plant, and aggregate deliveries from the quarry to customers in the metropolitan area.
Why is drilling and blasting required?
Drilling and blasting rock is necessary for us to generate the raw material suitable for producing aggregate. Linwood's aggregates range in size from around 75mm down to 2mm.
We need to break the rock into a manageable size for transport from the pit to the crushing plant. The rock also needs to be a particular size for feeding into the crusher at a consistent rate without causing blockages.
The natural properties of the rock determine the number of blasting holes to be drilled, the spacing between each hole, and the amount of explosive per hole to achieve the fragmentation required.
It is also important we understand the geology of the area to minimise any potential effects of blasting upon the community.
How is blasting done?
Blasting at Linwood is managed for Boral by Orica Blasting Services. Orica takes responsibility for both the 'design' of each blast (often called a 'shot') and its conduct.
Each blast is designed to ensure it can be carried out with minimal influence on surrounding properties and residents.
To do this, Orica makes use of its Monte Carlo blast modelling system which uses vibration data and waveforms to predict the level of vibration at particular locations.
The blast is then designed accordingly. Linwood is the only quarry in SA where Monte Carlo is in use.
Once the design has been determined, each 'bench' is drilled with a series of holes to the required pattern. The holes are drilled at the same angle and to the same length (bench heights range from 5 to 15m high).
The holes are then filled with an agent along with an initiating device such as a detonator. The blasting sequence and timing is then managed via computer software, all to the required design.
Once fired, the rock is not only broken by the explosive, but also by catapulting into itself, in effect crushing itself. The result is a pile of rock which has minimal oversize boulders and low quantities of fine dust.
How is it controlled?
Drilling and blasting at the quarry is closely monitored and recorded in accordance with Australian Standards. All blasts are measured for vibration, noise and dust using up to date electronic equipment.
Any resident with concerns relating to a particular blast are encouraged to contact the quarry using the details on our Contact Us page.
The movement of materials is a critical part of Boral's business. As with many large organisations, the ability to transfer volumes of raw resources and finished product is essential to the company's success.
To meet its needs, Boral operates a significant fleet of heavy vehicles and is a customer of a range of haulage contractors across Australia. The company is also a prolific user of rail services.
Boral recognises the safety obligations accompanying the large scale use of heavy vehicles on public roads. The business tries to ensure the highest standards of driving and vehicle maintenance are obtained.
We encourage all members of the community to give us feedback if they observe behaviour or incidents not aligning with this goal.
Specifics such as time, location, vehicle registration and colour help us to further investigate and take appropriate action.
For vehicles associated with the Boral Linwood Quarry or Boral Marino Concrete sites, you can send us your thoughts via email or by phoning the site on 8296 6230.
Information about our management of the potential effects of the Boral Linwood Quarry and Boral Marino Concrete on the environment are as follows:
Ensuring the proper management of dust emissions from quarry sites is an industry-wide challenge. The Boral Linwood Quarry has implemented a program of initiatives across many years as part of addressing this challenge.
The management of dust emissions is one of the main environmental challenges facing quarry operators. Through its experience with the issue, the Boral Linwood Quarry has evolved into a model of best practice in SA for dust mitigation practices. The generation of dust at Linwood is greatly influenced by the coastal location of the quarry. It experiences predominantly off-shore, south-westerly winds through most of the year.
Adelaide is also the driest Australian capital city with unreliable, light and infrequent rain through summer. The dry and windy conditions this creates exacerbates any 'nuisance' dust factors present in the background. 'Fugitive dust' can be initiated by operational activities and a mixture of sources. Traffic using internal haul roads, crushing plant, and stockpile areas are the most significant contributors to dust emissions.
To account for these factors, the quarry has developed an active system for minimising the risk of dust emissions. This involves:
- Monitoring (TEOM system): Five 'stations' have been established around the quarrying operations to help with the 'real time' management of dust at the site. These include five static monitors, five directional monitors, three weather stations, and three state-of-the-art dichotomous samplers which measure 'PM10', 'PM2.5' and 'PM Coarse' dust particles. The system is used to manage the timing of operational activities with the potential generate dust including 'stripping' of topsoil and overburden, and blasting.
- Stockpile water spray system - An automatically activated water spray system was installed during 2014 for 'priority' stockpiles. The 24-hours-per-day system uses the most advanced technology currently available to operate.
- Water cart - During 2011, a new 'water cart' was purchased for the quarry. The 35000 litre vehicle is used to keep roads and hard surfaces at the site wet to decrease the chances of fugitive dust.
- Wheel wash - The site's wheel wash, through which all vehicles exiting the quarry must be driven, was upgraded during 2010 to include three stages, ensuring a better wash.
- Enclosure of plant and conveyors - The primary crusher raw material feed hopper is roofed, enclosed on three sides, and has directional fine water sprays to minimise dust generation during tipping operations.
Conveyers are covered and product transfer points are fitted with fine water sprays. The final crushing and screening sections of the plant contain a dry dust collection system ('bag house') ducted to all crushers, screens, bins and conveyor transfer points.
- Street sweeping - Depending upon the frequency of sales and weather conditions, a street sweeper is regularly used at the quarry to clean the roads.
Rehabilitation and screening of the quarry
Extensive tree planting and screening mounds have been established around the quarry boundary over time to improve visual amenity.
These areas are maintained as part of an overall site management program. A management strategy has also been implemented which has seen:
- the formation of a western screening mound and landscaping to match the adjacent completed areas;
- visual upper 'terminal' faces on the east side of the quarry being laid back to a gentle angle, backfilled with overburden and topsoil, grassed and established with small stands of trees and shrubs;
- the upper faces on the west and east sides of the quarry being laid back as quarrying has progressed southward. This has been done to create landforms which assimilates with the adjacent landscape; and
- the main overburden dump, located southwest of the quarry, continued filling across an east-west gully to a point of equal elevation towards the southern boundary. The final landform will be shaped and graded into the adjacent natural contours, grassed and planted with trees and shrubs.
All trucks leaving site must leave via the 'wheel wash' at the exit. Waste water is captured and pumped into the site water recycling system for re-use in the truck wash and for dust suppression.
The Boral Marino Concrete plant contains 'washout' pits, used to collect waste concrete washed out of the bowls of concrete trucks.
Waste oil is placed into a single storage facility that is regularly emptied by a licensed contractor, and waste tracking forms are retained on-site.
Scrap steel is stockpiled and occasionally sold to waste metal merchants. Used tyres are sold or returned to the supplier.
An on-site water recycling network has been established to serve the needs of the concrete plant, the quarry's 'pug mill', and to access road stormwater.
The eco-friendly design allows the site to capture, filter and re-use stormwater by:
- use of a filtration system for the truckwash, enabling clean water to be used for vehicle cleaning;
- diverting stormwater to designated storage areas to reduce road maintenance and safety issues from mud and water build up around the plant; and
- reducing mains water usage by 75 percent through filtering and re-using stormwater and waste water in the concrete and pugmill plants for production and wash down.
Positive relationships with the community are an important part of conducting our business activities.
On this page you will find information about initiatives involving our neighbours and other local stakeholders, as well as updates on what's happening at our sites.
Boral Linwood Quarry Joint Working Group (JWG)
The Boral Linwood Quarry has operated a Joint Working Group (JWG) for many years. The JWG is the evolution of several previous community forums with an interest in the quarry. The first was the Marino Group, established in the 1990s to respond to the former Boral Marino Asphalt plant's establishment within the quarry site.
A separate Hallett Cove Group was formed in 2006 in response to concerns about blasting and the potential long term impacts on residents located closest to the quarry.
In May 2009, representatives from both groups were invited by Boral to form the present JWG. The first JWG meeting was held in August 2009, with terms of reference developed. Today's JWG continues to consist of representatives from Hallett Cove and Marino, Marion and Holdfast Bay City Councils, State Government authorities and Boral.
The objectives of the JWG are:
- to create a forum for discussion and exchange information related to the Boral Linwood Quarry operations;
- to raise issues of community interest or concern; and
- to work together to develop mitigation measures which minimise any effects of quarrying activity on the community.
The current residential representatives are:
- Ken Turnbull - Hallett Cove
- Colin Waterman - Hallett Cove
- Anna Bakuszowski - Hallett Cove
- Bronte Newman - Hallett Cove
- Fran Southern - Marino
- Beryl Hall - Marino
- Noel Paul - Marino
Residents are welcome to raise any feedback or questions about the quarry through the JWG.
The contact for Hallett Cove residents is Ken Turnbull (send an email), and for Marino is Fran Southern (send an email). To contact Beryl Hall or Hoel Paul, please send an email.
Joint Working Group Minutes Documentation
We welcome your comments and feedback about any topic relating to the Boral Linwood Quarry and Boral Marino Concrete plant.
Boral Linwood Quarry
Clubhouse Rd, Seacliff Park SA 5049
Ph: 08 8296 6230
Boral Marino Concrete
Clubhouse Rd, Seacliff Park SA 5049
Ph: 08 8298 2387
Acting Linwood Quarry Manager
Ph: 08 8296 1362
Batcher - Marino Concrete
Ph: 08 8298 2387
Stakeholder Relations Advisor
Ph: 03 9981 2925
Blast notification - Boral Linwood Quarry
The Boral Linwood Quarry maintains a register of neighbours who wish to be notified ahead of blasting events. To register for notification, please contact the site via the above and leave your preferred details.