Overview

Mine Type	Open Pit
Status	Closing / Closed
Commodities	Coal (thermal)
Mining Method	Truck & Shovel / Loader
Production Start	...
Snapshot	The Canterbury mine which closed in 2021 has been transformed through earthworks and restorative planting that have rehabilitated the site into being suitable for its former uses of pastoral farming and plantation forestry. During the year, final rehabilitation of the mine progressed with equipment operators completing rehabilitation earthworks in January 2023. Post-completion of all rehabilitation earthworks, identification of, and planning for required maintenance obligations and ongoing monitoring activities have been occurring.

Deposit type

• Sedimentary

Summary:

The project is located in the Canterbury Coalfield, Malvern Hills, New Zealand.

The defined resource is contained within the late Cretaceous to Early Paleocene aged Broken River Formation., formed during the Tertiary transgressive-regressive cycle between the Rangitata and Kaikoura Orogenys.

Overlying the coal measures is the Conway Formation, dominated by micaceous and quartz rich fine sandstones and mudstones indicative of littoral to shallow marine settings.

Pleistocene aged glacial outwash gravels and tills mask underlying stratigraphy over much of the area. Younger river gravels also dominate larger river valleys within the area.

Glacial derived windblown loess deposits mantle much of the area.

Igneous intrusions are present in the Malvern Hills area. Some contact metamorphism of coal measures has been observed with localized rank increases observed in some Canterbury coal samples, however none have been noted in the current resource area.

Generally the project area is structurally simple. Coal seams are not greatly affected by cross cutting faults. Seam dips range between 20° in the south to 50° the north of the current open pit area. In some locations it has been observed that localised slumping has caused overturning of the coal seams.

Depth of cover (DOC) varies from 0m at outcrop to over 200m at the Southeastern boundary of the model. The strike length of the deposit is in excess of 4km.

Mining Methods

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Comminution

Crushers and Mills

Processing

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Production

Commodity	Units	2021	2020	2019	2018	2017	2016	2015
Coal (thermal)	Mt	....	....	0.1	0.1	0.1	0.06	0.003

Operational metrics

Metrics	2021	2020	2019	2018	2017	2016	2015
Waste	....	....	1,773,300 bcm	1,257,000 bcm	824,187 bcm	594,743 bcm	106,799 bcm
Coal tonnes mined	....	....

Personnel

Job Title	Name	Profile	Ref. Date
.......................	.......................		Nov 20, 2023
.......................	.......................		Nov 20, 2023