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Australia
Coburn Project

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

  Project Contacts:
London House, Level 9 216 St Georges Terrace
Perth
Western Australia, Australia
6000
Phone  ...  Subscription required
Fax+61 8 9485 2070
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageConstruction
Mine TypeOpen Pit
Commodities
  • Ilmenite
  • Zircon
  • Rutile
  • Leucoxene
Mining Method
  • Truck & Shovel / Loader
  • Backfill
Processing
  • Electrostatic separation
  • Spiral concentrator / separator
  • Attrition
  • Gravity separation
  • Magnetic separation
Mine Life22.5 years (as of Jan 1, 2019)
The Coburn project is one of the largest new mineral sands development projects in the world, underpinned by an attractive high-value product suite, conventional design and low-cost operation.
During the 2021 construction is well underway at Coburn, with early works and delivery of key equipment running in line with our schedule and budget. This means Company on track to meet its goal of first production in the December quarter of 2022
Latest NewsStrandline Resources Ltd.: Construction progress reaches 50% complete at the Coburn mineral sands project in WA     January 17, 2022


Owners

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

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% lmenite

-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 Life “Extension Case” Scoping Study


Mining Methods

  • Truck & Shovel / Loader
  • Backfill


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 the dozers will be aided by the application of modern GPS tracking and level control technology

-The mining and related earthmoving activities will be delivered under a contract mining arrangement. The mining contractor will be responsible for efficiently feeding material to the EMU and DMU’s as per the mine plan and also performing the necessary contouring of tails and in-pit slimes, subsoil-topsoil replacement, haul road maintenance, bench management and drainage, in pit dewatering and re-contouring of the completed pit area in readiness for rehabilitation

-Strandline will be responsible for statutory duties, technical services, geology and detailed mine planning, potable water, power and communication systems.

September 14, 2020 (Australian Mining) - Strandline Resources has awarded Piacentini & Son a contract to design and construct mobile dozer mining units for its Coburn mineral sands project in Western Australia.

The scope of work includes the design, procurement, construction and commissioning of three in-pit dozer units.

They will be capable of receiving and delivering ore to the processing facilities at an average rate of 3100 tonnes an hour, based on two units operating at one time.

The dozer units will play a part in executing Strandline’s dry mining methodology at the Coburn project, which is set to produce zircon and titanium mineral sands once operational.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Electrostatic separation
  • Spiral concentrator / separator
  • Attrition
  • Gravity separation
  • Magnetic separation

Flow Sheet: Subscription required

Summary:

The WCP receives ore from the mining units and associated pumping system at an average rate of 3,000tph. A high grade 95% Heavy Mineral Concentrate is produced through multiple stages of high efficiency gravity separation and classification technology

Wet Concentration Plant (WCP). The WCP receives ore from the mining units and associated pumping system at an average rate of 3,000 tph. A high grade 95% Heavy Mineral Concentrate is produced through multiple stages of high efficiency gravity separation and classification technology
-The WCP beneficiates the heavy minerals (ilmenite, leucoxene, rutile, zircon) and rejects the non-valuable, lighter minerals through multiple stages of high-capacity gravity separation and classification
-WCP process is designed to produce Heavy Mineral Concentrate (HMC) containing nominally 95% HM
-The WCP infrastructure is relocatable and is planned to be moved as mining advances along the orebody in years 8, 10, 18 & 19
-HMC ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Ilmenite Recovery Rate, % 96.2
Zircon Recovery Rate, % 58.3
Rutile Recovery Rate, % 84.7

Projected Production:

CommodityProductUnitsAvg. Annual
Ilmenite Mineral t 110,000
Zircon Mineral t  ......  Subscription required
Zircon Concentrate kt  ......  Subscription required
Rutile HiTi90 t  ......  Subscription required

Operational Metrics:

Metrics
Ore tonnes mined, LOM  ......  Subscription required
Annual mining rate  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at April 16, 2019:
Mineral Resources reported at a cut-off grade of 0.8% THM

CategoryTonnage CommodityGradeContained Metal
Proven 106 Mt Heavy Minerals 1.1 % 1.16 Mt
Probable 417 Mt Heavy Minerals 1.12 % 4.66 Mt
Proven & Probable 523 Mt Heavy Minerals 1.11 % 5.83 Mt
Measured 1.5 Mt Ilmenite 45 %
Measured 1.5 Mt Zircon 24 %
Measured 1.5 Mt Rutile 5 %
Measured 1.5 Mt Leucoxene 6 %
Measured 119 Mt Heavy Minerals 1.3 % 1.5 Mt
Indicated 7.7 Mt Ilmenite 48 %
Indicated 7.7 Mt Zircon 22 %
Indicated 7.7 Mt Rutile 7 %
Indicated 7.7 Mt Leucoxene 5 %
Indicated 607 Mt Heavy Minerals 1.3 % 7.7 Mt
Inferred 10.4 Mt Ilmenite 49 %
Inferred 10.4 Mt Zircon 21 %
Inferred 10.4 Mt Rutile 7 %
Inferred 10.4 Mt Leucoxene 4 %
Inferred 880 Mt Heavy Minerals 1.2 % 10.4 Mt
Total Resource 19.6 Mt Ilmenite 48 %
Total Resource 19.6 Mt Zircon 22 %
Total Resource 19.6 Mt Rutile 7 %
Total Resource 19.6 Mt Leucoxene 5 %
Total Resource 1,606 Mt Heavy Minerals 1.2 % 19.6 Mt

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Heavy Minerals AUD  ......  Subscription required *
C1 cash costs Heavy Minerals AUD  ......  Subscription required *
* According to 2020 study / presentation.
Subscription required - Subscription is required.

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
Total OpEx $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
EBITDA (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 17, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Subscription required - Subscription is required.

News:

NewsDate
Strandline Resources Ltd.: Construction progress reaches 50% complete at the Coburn mineral sands project in WA January 17, 2022
Strandline secures mine-to-ship services with Qube November 22, 2021
Coburn progress has Strandline on track for first production October 28, 2021
Strandline locks in key mining services contract at Coburn October 4, 2021
Strandline locks and loads Coburn May 4, 2021
NRW strengthens Coburn involvement with $135m contract April 29, 2021
Strandline fills up Coburn LNG supply April 27, 2021
Strandline flicks switch for Coburn power supply March 10, 2021
Strandline selects Contract Power for Coburn power station November 4, 2020
Strandline awards three major Coburn contracts November 2, 2020
Primero secures Strandline contract for Coburn development September 29, 2020
Strandline appoints Primero Group preferred contractor to build Coburn processing facilities September 29, 2020
Strandline hands dozer contract to Piacentini September 14, 2020
Strandline declares Macmahon preferred contractor for Coburn April 30, 2020
Strandline delivers 70% boost to ore reserve at Coburn April 16, 2019

Aerial view:

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