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New Zealand
Stockton Mine

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 Location:
24 km E from Westport, New Zealand

  Address:
Stockton Mine Road
PO Box 250 Westport 7866
Stockton
New Zealand
7823
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Fax+64 3 788 8067
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Coal (metallurgical)
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life10 years (as of Jan 1, 2022)
Stockton is the largest opencast mine in New Zealand.

Stockton is an open cut mine producing low-ash metallurgical coal that is exported overseas for use in steelmaking.

Extension projects consist of the Hope Lyons block development (“HL”), the A18 fines (“A18”) project, and a natural southern extension of operations into open cut pits within the Upper Waimangaroa permit area.


Owners

Source: p. 7,20,72
CompanyInterestOwnership
Talley’s Energy Ltd. 35 % Indirect
Bathurst Resources Ltd. 65 % Indirect
BT Mining Ltd. (operator) 100 % Direct
Stockton, Upper Waimangaroa are owned by BT Mining Limited. BT Mining Limited is a joint-venture between Bathurst Resources Limited (65%) and Talley’s Energy Limited (35%). Bathurst Resources Ltd currently operates Stockton Opencast Mine.

Contractors

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Deposit Type

  • Sedimentary


Summary:

Coal resources on the Stockton Plateau are restricted to the Middle to Late Eocene aged Brunner Coal Measures (BCM). The BCM unconformably overlies the Ordovician aged Greenland Group greywackes and argillites, which has been extensively intruded by Cretaceous granites and porphyry (Berlins Quartz Porphyry). Due to the stratigraphic nature of coal measures, the coal seams generally lie in a horizontal or sub-horizontal plane. The resource has a dip to the northeast at the northern end of the deposit and to east along the western margin. Folding and faulting through the coal seams can create localised changes in dips up to 80°.

Stockton
The Mangatini coal seams are the main coal seams of the Stockton deposit. The seams have been given the abbreviation M. There are the three seams M1, M2, and the M3. The M2 seam is the predominant seam over the deposit and splits into four segregated seams in places. The M1 seam is thin and discontinuous stratigraphically below the M2 and not considered for resource estimation. The M3 is a rider seam to the M2 however the seam is discontinuous and often not recovered during mining. The M3 is not considered during resource estimation.

The Stockton resource area covers approximately 22.9km², a roughly rectangular shape up to 3.5km wide (E-W), and 8km long (N-S).

Within this area all seams are exposed in the operating mine, with in situ coal between 0m and 50m below the original ground surface.

Coa ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Stockton
The mining method is conventional drill and blast, load and haul open pit mining operation. This utilises truck and excavator for waste movement, while coal is loaded using a combination of loaders and excavators with haulage to the run-of-mine (ROM) hopper CHPP, or stockpiles using dump trucks. The operations are supported by additional equipment including dozers, grader and watercarts. The selected mining method is based on long term experience of local conditions.

Minimum recoverable in situ thickness is 0.5m.

Specific parameters are applied to each pit. Pit designs have been based on geotechnical constraints and parameters. The typical highwall configuration is a batter height of 15m with batter angles between 30°- 76° using 8.5m wide benches. A maximum 10% gradient and 23m wide running surface is being used for in pit ramps and roads.

Pit limits have been updated based on pit optimisation studies with restrictions for current land and mineral access determined by mining permits and granted consent limits.

Additional recovery factors for Millerton, Hope Lyons and Rockies mining block areas include losses for historical underground extraction, fire effected coal, and where the overburden material has collapsed into the coal seam.

Approximately 61% of total Coal Reserve tonnes require washing to make a marketable product.

Minimum mining widths are dependent on volumes to be excavated and the siz ........


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits20222021202020192018
Coal (metallurgical) Mt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1
All production numbers are expressed as clean coal.
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Operational Metrics:

Metrics20222021202020192018
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required3.65 Mbcm2.9 Mbcm
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Reserves at June 30, 2022:
Stockton:
Coal Resources: a minimum seam thickness cut off for all modelled seams is 0.5m. A maximum ash cut-off of 25% has been applied.
Coal Reserves: A maximum ash cut-off of 25% has been applied to all coal seams except where seam continuity is required, which may include intervals with greater than 25% ash.

Upper Waimangaroa:
Coal Resources: a minimum seam thickness cut-off for all modelled seams is 0.50m. A maximum ash cut-off of 25% has been applied.
Coal Reserves: a maximum ash cut-off of 25% has been applied to all coal seams except where seam continuity is required, which may include intervals with greater than 25% ash. The minimum mineable seam thickness is 0.5m.

CategoryTonnage CommodityMarketable Coal
Proven 0.9 Mt Coal (metallurgical) 0.7 Mt
Probable 7.6 Mt Coal (metallurgical) 5.7 Mt
Proven & Probable 8.5 Mt Coal (metallurgical) 6.4 Mt
Measured 3.2 Mt Coal (metallurgical)
Indicated 21.1 Mt Coal (metallurgical & thermal)
Inferred 39.1 Mt Coal (metallurgical & thermal)
Total Resource 63.4 Mt Coal (metallurgical & thermal)

Financials:

Units20222021202020192018
EBITDA M NZD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 105.9  
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Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 4, 2023
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Staff:

EmployeesYear
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Year-end Mineral Reserves 2018
Other 2010
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