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New Zealand
Maramarua Mine

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 Location:
32 km N from Huntly, New Zealand

  Address:
580 Coalfields Road RD1
Private Bag 502 Huntly 3740
Maramarua
New Zealand
2471
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
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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 Life7 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.

Wetter weather than usual was a consistent issue which increased operational downtime. Significant rainfall in June 2022 also contributed to an extensive slip in Maramarua’s pit, which impacted coal supply into August 2022.

M1 pit (Maramarua mine)
The project is scheduled to start in FY23 on approval of consents, with the coal destined for the same customers as current operations.


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 Maramarua Mine and has appointed Bathurst as the mine operator.

Contractors

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Deposit Type

  • Sedimentary


Summary:

The stratigraphy of the Maramarua Coalfield is similar to that of other northern Waikato Coalfields, being dominated by thick, Cenozoic, Te Kuiti Group sediments which unconformably overlie Mesozoic basement rock of the Newcastle Group. The Waikato Coal Measures, and later Te Kuiti Group sediments, were deposited in a broad north to northnorthwest trending elongated trough which appears to have been controlled by structural trends within the underlying Newcastle Group basement rock. The Waikato Coal Measures are present over the entire coalfield with a thickness of up to 134 m. The Kupakupa main seam (KK) is located near the base of the coal measures, is the most widespread and thickest seam, and ranges in thickness ranging from less than 1 m to 15 m. The Kupakupa seam has up to four lower seams (KL1, KL2, KL3, KL4) located 1 m to 3 m below the main KK seam. These lower seams are discontinuous and generally less than a metre thick. The Kupakupa seam is overlain by carbonaceous shales, siltstones and claystones of the upper Te Kuiti Group. The generalised structure of the coalfield dips at 15° north-northwest and flattens out towards the Miranda Fault due to fault drag effects on the hanging wall. Two major faults dominate the deposit. -The Foote Fault zone is interpreted to be a large displacement fault striking northnortheast that is downthrown to the southeast with an estimated throw of 150 m. -The Miranda Fault is a northeast striking fault, with displacements of up ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

At Maramarua, waste rock is transported and stored in an engineered landform to backfill a historical opencast pit. The low sulphur levels in the coal will mean acid mine drainage will not occur. Pit limits have been determined using pit optimisation techniques, with restrictions for current land and mineral access. Pit optimisations used current cost and revenue budget assumptions. All mining is via open cut methods. Mining equipment is hydraulic backhoes/mechanical drive rigid body trucks and articulated trucks. Pit slopes for the revised K1 design have been geotechnically assessed and found to be in accordance with BRL stability criteria. The pit design for M1 (formerly known as KCQ2) has not been specifically geotechnically assessed but does use updated site-specific generic design criteria for each rock unit. Coal is present in a thick seam and is easily distinguishable from the surrounding waste rock. Coal quality has been shown to be consistent both laterally and within the seam Coal recovery estimates consist of two parts: - Minimum recoverable in-situ thickness is 0.5m - 75mm of coal is assumed lost from both the roof and the floor (150mm in total) during mining to ensure no waste dilution within the coal. Minimum mining widths are to suit 90t capacity trucks and are typically >50m. The selected mining method requires simple infrastructure to support mobile open-cut mining equipment (i.e. workshop, fuel farm, site ablution and offices).


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits20222021202020192018
Coal (thermal) Mt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required0.1
All production numbers are expressed as ROM coal.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20222021202020192018
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required2,625,666 bcm1,739,000 bcm
Coal tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required0.2 Mt of ROM coal0.1 Mt of ROM coal
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Reserves at June 30, 2022:
Mineral Resources: A maximum ash cut-off of (20% air-dried basis) has been applied to all seams.

CategoryTonnage CommodityMarketable Coal
Proven 1.2 Mt Coal (thermal) 1.2 Mt
Probable 0.2 Mt Coal (thermal) 0.2 Mt
Proven & Probable 1.4 Mt Coal (thermal) 1.4 Mt
Measured 1.8 Mt Coal (thermal)
Indicated 0.3 Mt Coal (thermal)
Total Resource 2.1 Mt Coal (thermal)



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 3, 2023
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2022
Subscription required 2020
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Other 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
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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