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Australia
Coburn Extension Project (Coburn)

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 Location:
245 km NW from Geraldton, Western Australia, Australia

  Project Contacts:
London House, Level 9 216 St Georges Terrace
Perth
Western Australia, Australia
6000
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Fax+61-8-9485-2070
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  • Overview
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Heavy Minerals
Mining Method
  • Truck & Shovel / Loader
Mine Life15 years (as of Jan 1, 2020)
The purpose of the Scoping Study was to ascertain the financial benefits of a longer mine life by scheduling production targets from the JORC-compliant (2012) Indicated (7Mt @ 1.1% THM) and Inferred (702Mt @ 1.2% THM) Mineral Resources. The Mineral Resources lie north and directly adjacent to the current granted Mining and Retention Licences and are interpreted to represent the strike continuation of the same body of mineralisation currently defined by the DFS Ore Reserves.

The production targets are scheduled from year 23 when the current DFS Ore Reserves are depleted and additional feed is required. The Extension Case adds 15 years of production to the mine life (total 37.5 LOM).


Owners

Source: p. 4, 16
CompanyInterestOwnership
Strandline Resources Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Mineral sands


Summary:

Coburn is a world-scale mineral sands deposit, containing a rich zircon-titanium HM assemblage, with 20Mt of in-situ HM, low slimes, low oversize and strong geological continuity across and along strike.

Coburn’s Amy deposit was discovered in 2000 after prospectors identified that the ancient coastline at Coburn was an ideal trap-site for heavy mineral sands with its characteristic hook shape.

Mineralisation consists of an accumulation of mainly aeolian sands deposited over a Cretaceous basement of clays, clayey sands and limestone.

A total of 3 dune sequences containing heavy mineral are recognised across the project area.

The Amy South mineralisation has a strike length of approximately 27 km, a width up to 3 km and a maximum thickness of approximately 50 metres. Amy North adds a further 6km in strike length.

IHC Robbins issued (November-2018) JORC compliant Global Mineral Resource estimate of 1.6Bt HM at 1.2% THM (cut-off grade of 0.8%).

Measured-Indicated resources of 726Mt at 1.3% THM contained in the Amy South deposit (doesn’t include Amy North) have been evaluated as part of the DFS and updated Ore Reserve.

Amy South deposit comprises an exceptionally rich heavy mineral assemblage of 22% zircon, 12% rutile-leucoxene and 48% ilmenite.

Indicated-Inferred resources extending north and along strike of the Ore Reserve, totals 709Mt at 1.2% THM which have been evaluated in the Mine Li ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Conventional open pit dry mining in free-dig sand using D11 dozers feeding mobile Dozer Mining Units (DMUs), with in pit tailings deposition and progressive backfill and rehabilitation.

Seeds will be collected from vegetation across the orebody prior to the vegetation being removed by heavy mobile equipment. Collected seeds will be used in the mine rehabilitation process.

Topsoil and Subsoil material will be stripped by dozer or scraper and will be either placed in stockpiles in the vicinity of the pit or placed directly on top of recontoured tails areas. Both topsoil and subsoil will be managed to minimize stockpile duration.

Overburden, where present, will be removed by large capacity bulldozers and placed in the pit void immediately behind the mined-out ore. Interburden removal is carried out by an excavator and the EMU (Excavator Mining Unit). No drill and blast is required.

Ore is pushed by a fleet of D11 manned carry dozers to DMUs (dozer trap), oversize material is wet screened separated from the slurry undersize which is subsequently pumped to the ore processing facilities. The DMU’s are skid mounted and moved on average every 6 days during the LOM.The EMU alternates between overburden removal and ore processing during periods of DMU movement.

Grade control of the ore has been defined through the mine optimisation and scheduling process to achieve the target feed head grade to the plant. Operation efficiency of t ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Combined production numbers are reported under Coburn

Operational Metrics:

Metrics
Ore tonnes mined, LOM  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2020 study.
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Reserves at April 16, 2019:

CategoryTonnage CommodityGrade
Indicated 7 Mt Heavy Minerals 1.1 %
Inferred 702 Mt Heavy Minerals 1.2 %
Total Resource 709 Mt Heavy Minerals 1.2 %

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Total OpEx $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
EBITDA (LOM) $M AUD  ......  Subscription required
Subscription required - Subscription is required.


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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