NSW MINING Health, Safety, Environment & Community

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1 NSW MINING Health, Safety, Environment & Community

2 Developing Natural Landform in Mine Overburden Rehabilitation Tasman Willis Land Management Officer Mangoola Open Cut - Glencore

3 Developing Natural Landform in Mine Overburden Rehabilitation Background Initial Work Natural Landform Model Final Landform Mine Planning Rainfall and Erosion Revegetation and Habitat Structures

4 Background This presentation aims to discuss the process of implementing a natural landform in mine rehabilitation at Mangoola Open Cut Mangoola Open Cut coal mine operating since 2010, rehabilitation commenced in October 2011.

5 Background Greenfield site surrounded by undulating hills. Hunter River to the south-east, escarpment generally to the south and west. The approved mining area is undulating hills between the Hunter River and Wybong Creek.

6 Background Original approved landform for North Pit 2010 Opportunity was identified to develop rehabilitation that would be more suited to fit into the surrounding undulating landform

7 Initial Work The first stages of natural landform was developed by Mangoola mining engineers over 9 ha (not Geofluv) in Natural landform was not a consent condition, this was internally recognised as a positive and management committed to any additional costs and time associated with the trial.

8 Natural Landform Model 1300ha project area, work undertaken externally (Umwelt/Jacobs) The modelling program selected for this project was Natural Regrade (Carlson Software) - Geofluv. Approximate mining Boundary Pre-mining landscape, facing south

9 Data Collection The process of developing the natural landform design includes: 1.Testing of material to understand erosion and infiltration rates; 2.Evaluate characteristics of existing drainage lines; 3.Blend ridges and creek alignments in with the surrounds; 4.Run the model using the Natural Regrade (Geofluv) software; and 5.Generation of suitable dxf file for use with mine design software.

10 Mine Rehabilitation Landform Model Output for Mining Engineers, facing south-east

11 Mine Rehabilitation Landform Final output from Model video files

12 Mine Rehabilitation Landform The output was more detailed than expected. Detail included modelling creek bank designs for all creeks and drainage lines. Recent MOP (REMP) plans were all developed using this natural landform model. The output was provided to the Mine Engineers.

13 Mine Planning Mining engineers plan ten metre lifts, due to the size of our machines and dump lift heights. This also allows less material pushed and more detail landform shaping.

14 Mine Planning Ramp and dump strategies were established in the preliminary stages of developing the model and therefore achieving the final landscape did not interfere with the progression of the dump.

15 Mine Rehabilitation Landform

16 Mine Rehabilitation Landform Seeded March 2014, Photo August 2015

17 Mine Planning

18 Rainfall November 2013 to July 2015

19 Erosion and Remediation Main erosion issues have been the result of: Overflow from mining area as mine progresses upslope of the rehabilitation. Rip lines not occurring level across contour. Vehicle access across rip lines. July 2013 July 2015 July 2015

20 Revegetation and Habitat Structure After the landform is shaped, the areas are strategically targeted for specific vegetation types that occur in the surrounding local area, based on similar topography, slope, aspect and topsoil type. Only species that occur in the local area are used in rehabilitation. Habitat structures are established including, wood piles, rock piles, standing habitat trees, low areas of inundation and dams. Nest boxes will be installed over time as the vegetation provides appropriate habitat.

21 Determining Vegetation Communities

22 Establishing Vegetation Communities Grey Box-Ironbark Woodland Slaty Box Woodland

23 Mine Rehabilitation Vegetation Growth January 2012 May 2014 July 2015 March 2013 May 2014 July 2015

24 Contributions The project was a whole of mine effort involving mine employees, local contractors and consultants. Significant input was provided by the Mining Engineers, Production Department and Environment and Community Representatives. Thanks Everyone: Umwelt/Jacobs natural landform design Subzero final trim/topsoil application/habitat structures Future Harvest seed collection and application

25 Any Questions

26 NSW MINING Health, Safety, Environment & Community

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