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7/8/2011
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Innovative Uses of LIDAR Technology to Assist in the Remediation of former
Coal Mine Sites
Glenn MacLeod
The Sydney Coalfield has been mined for more than 300 years and over 100 underground mines have extracted in excess of 350,000,000 tonnes of coal.
Queen Pit, Sydney Mines 1854 -1917
CBU
Prince
FlorenceNo. 12
Point Aconi
Atlantic Ocean
Hub Seam
Harbour Seam
Phalen Seam
Emery Seam
Sequence of Coal Seams
75
Sydney
Princess
Queen
No. 20
No. 26
No. 4No. 6
Princess
No.16
No. 12
No. 9
No. 5
No.1A
No. 1B
No. 8
No. 2
No. 20
No. 4
No. 11
No. 24
No. 24
Lingan
Phalen
No.1A
No. 1B
No. 5
No. 9
No. 10
No. 26
New Waterford
Sydney Mines
Glace Bay
Donkin Tunnels
LinganNo. 12
No. 20
No. 8
Phalen
No.1A
No. 1B
No. 5
No. 9
No. 10
No. 26Lingan
No. 20
No. 5
Glace Bay
DonkinCBU
50 km
PWGSC / ECBC Mine Site Remediation
1. The identification of unstable ground and mine openings that could potentially fail during and after site remediation; and
IMWA 2010 Sydney, Nova Scotia | “Mine Water & Innovative Thinking”
© by Authors and IMWA
7/8/2011
2
2. The identification of potential locations where acid mine water might discharge and enter the environment in an uncontrolled manner.
LiDAR – Light Detection And Ranging
LiDAR is an airborne laser profiling system that produces location and elevation data to define the surface of the earth and the heights of above-ground features
CBU
FUGRO EARTHDATA, INC.
In this example, the first return measurement is a range value of the tree top; the last return is the ground. By acquiring first- and last-pulse data simultaneously, it is possible to measure both tree heights and the topography of the ground.
Data Validation Method
Survey showed a mean difference of 0.02m with a standard deviation of 0.04m between the Ground Survey and LiDAR Survey
X , Y, Z
1 sq km tile can have >1,000,000 data points
IMWA 2010 Sydney, Nova Scotia | “Mine Water & Innovative Thinking”
© by Authors and IMWA
7/8/2011
3
Digital Elevation Model (DEM)
Port Morien
CBU
Aerial Photograph of LiDAR Survey Study Area
Port Morien, Nova Scotia
Digital Elevation Model (DEM) created from LiDAR Survey Data
Port Morien, Nova Scotia
Digital Elevation Model (DEM) created from LiDAR Survey Data
Port Morien, Nova Scotia
Digital Elevation Model (DEM) created from LiDAR Survey Data
Port Morien, Nova Scotia
IMWA 2010 Sydney, Nova Scotia | “Mine Water & Innovative Thinking”
© by Authors and IMWA
7/8/2011
4
High Precision Topographic Maps created from LiDAR Survey Data
Port Morien, Nova Scotia
High Precision Topographic Maps created from LiDAR Survey Data
Port Morien, Nova Scotia
Subsidence Detected over Shallow Mine Workings with DEM
Port Morien, Nova Scotia
Digital Elevation Model (DEM) created from LiDAR Survey DataOverlain with the Blockhouse Colliery Mine Plan
Port Morien, Nova Scotia
Subsidence Detected over Shallow Mine Workings with DEM
Port Morien, Nova Scotia
Digital Elevation Model used to Detect Former Mine Shafts
Port Morien, Nova Scotia
IMWA 2010 Sydney, Nova Scotia | “Mine Water & Innovative Thinking”
© by Authors and IMWA
7/8/2011
5
Digital Elevation Model used to Detect Former Mine Shafts
Port Morien, Nova Scotia
Digital Elevation Model (DEM) created from LiDAR Survey Data
Port Morien, Nova Scotia
Questions?
Glenn MacLeod
Innovative Uses of LIDAR Technology to Assist in the Remediation of former
Coal Mine Sites
Glenn MacLeod
Questions?
Remediation Concerns
Two of the concerns are: 1) The identification of unstable ground and
mine openings that could potentially fail p g p yduring and after site remediation; and
2) The identification of potential locations where acid mine water might discharge and enter the environment in an uncontrolled manner.
Trough Subsidence
IMWA 2010 Sydney, Nova Scotia | “Mine Water & Innovative Thinking”
© by Authors and IMWA
7/8/2011
6
IMWA 2010 Sydney, Nova Scotia | “Mine Water & Innovative Thinking”
© by Authors and IMWA
