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New Zealand
Rotowaro Mine

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 Location:
9 km SW from Huntly, New Zealand

  Address:
732 Rotowaro Road, Huntly West
Private Bag 502, Huntly, 3740
Huntly
New Zealand
3771
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WebsiteWeb
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  • Overview
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  • Geology
  • Mining
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  • Production
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  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Coal (thermal)
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life3 years (as of Jan 1, 2022)
North Island domestic (“NID”) consists of the Rotowaro and Maramarua mines. Both produce a low-ash, low sulphur thermal coal for local steelmaking, energy generation, and other food and agricultural industries.

The Rotowaro North project is a potential extension project to the current Rotowaro mine operation.

The project is in the conceptual phase where Bathurst has confirmed the resource tonnes. No major project advances were made during 2022 year, however mine permit maintenance activities were completed, and Bathurst continues to assess options for development of this project.


Owners

Source: p. 72
CompanyInterestOwnership
Talley’s Energy Ltd. 35 % Indirect
Bathurst Resources Ltd. 65 % Indirect
BT Mining Ltd. (operator) 100 % Direct
BT Mining is a joint-venture between Bathurst Resources Limited (65%) and Talley’s Energy Limited (35%).

BT is the permit holder and permit operator of the Rotowaro Mine and has appointed Bathurst as the mine operator.

Contractors

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Deposit Type

  • Sedimentary


Summary:

The Rotowaro deposit trends north-south to the north of 618250mN and northwest-southeast to the south of 618250mN (Mt Eden Circuit 1949).

The dip is to the northwest at the northern end of the deposit and to the southwest along the western margin.

There are a series of northwest-southeast trending anticlines and synclines in the central and east of the deposit. Rotowaro is bounded to the southwest by the Mangakotukutuku Monocline, with a net throw of 90 m down to southwest, and to the northeast by the extension of the Waipuna Fault scarp.

There are only minor faults identified within the deposit, with throws less than 10 m in height. These faults are either recorded on historical underground mine plans or interpreted from structure contour plans derived from drill holes.

The area is underlain by indurated siltstones, with common sandstones, of the Mesozoic Newcastle Group, which is weathered to a depth of 5-30 m. This unit is referred to as “Basement” and has no economic significance.

The Waikato Coal Measures (WCM) lie unconformably on the basement and form the lower part of the Te Kuiti Group. The WCM consist mainly of mudstones and siltstones, often referred to collectively as “fireclay”, with common siderite concretions, referred to as “hardbars”.

There are three major coal seam groups within the WCM: Renown, Kupakupa and Taupiri.

The Taupiri seams are only represented in the Callaghan’s sector o ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The site operates using traditional truck and shovel open cut mining methods with parameters selected from long term experience of local conditions.

Mining recoveries - minimum recoverable coal seam thickness is 0.5 m. 1 % of the in situ is assumed to be lost and is not included in the Coal Resource Estimate.

Minimum mining thickness, seam compositing factors, losses associated with u/g mining and washery yield.

Truck and shovel has been determined to be most cost effective mining method given the multiple coal seams as well as the requirement for large quantity of ex-pit dumping initially required. This is the proven mining method in terms of past and present operations at site.

Geotechnical parameters for cut slope design were developed based on historical cut slope performance, slope back-analysis and laboratory testing of material strength parameters. Basic highwall design criteria include slopes in Waikato Coal Measures (fireclay and coal) and ‘softs’ (marine sediments, quaternary clays and old backfill). Slopes are designed to comply with a Factor of Safety that exceeds 1.2 and within BRL’s risk volume criteria which is a function of the probability of failure and potential failure dimensions. Consideration of underground workings intersecting highwalls also considered.

Mining dilution factors are minimum mining tk 0.5m, parting 0.1m, coal waste 10:1, roof/floor losses 0.15m (combined) per recoverable seam.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits20222021202020192018
Coal (thermal) Mt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required0.7
All production numbers are expressed as clean coal.
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Operational Metrics:

Metrics20222021202020192018
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required9,076,520 bcm6,984,000 bcm
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Reserves at June 30, 2022:
Mineral Resources: A minimum coal seam thickness cut-off for all modelled seams is 0.10m. A maximum ash cut-off of 20% has been applied to all seams.

Rotowaro North deposit Mineral Resources: A minimum coal seam thickness cut off for all modelled seams is 0.5m.

CategoryTonnage CommodityMarketable Coal
Proven 0.6 Mt Coal (thermal) 0.5 Mt
Probable 1.4 Mt Coal (thermal) 1.2 Mt
Proven & Probable 2 Mt Coal (thermal) 1.7 Mt
Measured 0.6 Mt Coal (thermal)
Indicated 1.4 Mt Coal (thermal)
Inferred 4.1 Mt Coal (thermal)
Total Resource 6.1 Mt Coal (thermal)


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 4, 2022
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Staff:

EmployeesYear
Subscription required 2022
Subscription required 2020
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Year-end Mineral Reserves 2022
................................... 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 2017
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