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Australia
Coburn Project

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

  Project Contacts:
35 Richardson Street
PO Box 1217, West Perth, 6872
West Perth
Western Australia, Australia
6872
Phone  ...  Subscription required
Fax+61 8 9485 2070
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  • Mining
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  • Personnel
  • Filings & News

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Overview

StagePermitting
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)
11/02/2020- Construction ready.
Latest NewsStrandline flicks switch for Coburn power supply     March 10, 2021


Owners & OPERATOR

Source:
CompanyInterestOwnership
Macmahon Holdings Ltd. (operator)
Strandline Resources Ltd. 100 % Indirect
Primero has started front end engineering design activities in preparation for the construction.

The agreement follows Strandline’s $18.5 million raising to advance early works development activities at Coburn.

It is the latest among Strandline’s recent contract spree at the Coburn project, including a mining services contract and a contract to design and construct mobile dozer mining units awarded to Macmahon and Piacentini & Son, respectively.

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


Processing

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

Flow Sheet: Subscription required

Summary:

-The testwork confirmed a process circuit capable of producing a high-grade saleable 95% Heavy Mineral Concentrate (HMC) product from the Wet Concentrator Plant (WCP), and final finished products through further processing by the Mineral Separation Plant (MSP)
-Engagement with leading global mineral sands consumers during the DFS confirmed the saleability and high market appeal of Coburn’s products in both concentrate and final product form. As such, the DFS presents development options for the “HMC Case” and “Final Products Case”
-A key feature is the uplift in separation efficiency using modern technology (resulting in improved WCP and MSP recoveries compared to previous testwork)

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 ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Ilmenite Recovery Rate, % 95.4
Zircon Recovery Rate, % 54.8
Rutile Recovery Rate, % 70.9

Projected Production:

CommodityProductUnitsAvg. Annual
Ilmenite Mineral t 110,000
Zircon Mineral t  ......  Subscription required
Zircon Mineral in concentrate t  ......  Subscription required
Rutile HiTi90 t  ......  Subscription required

Operational Metrics:

Metrics
Ore tonnes mined, LOM  ......  Subscription required
Annual mining rate  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

Reserves at April 16, 2019:

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 119 Mt Heavy Minerals 1.3 % 1.5 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 %
Indicated 607 Mt Heavy Minerals 1.3 % 7.7 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 %

Commodity Production Costs:

CommodityUnitsAverage
C1 cash costs Heavy Minerals USD  ......  Subscription required *
Assumed price Leucoxene USD  ......  Subscription required *
Assumed price Rutile USD  ......  Subscription required *
Assumed price Zircon USD  ......  Subscription required *
Assumed price Ilmenite USD  ......  Subscription required *
* According to 2019 study / presentation.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
Total CapEx $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 Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
After-tax NPV @ 8% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-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 Sep 29, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

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

News:

NewsDate
Strandline flicks switch for Coburn power supply March 10, 2021
Strandline locks in Coburn final offtake March 3, 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 hands dozer contract to Piacentini September 14, 2020
Strandline to accelerate development of Coburn August 6, 2020
Strandline wins NAIF loan for Coburn project July 16, 2020
Strandline declares Macmahon preferred contractor for Coburn April 30, 2020
Strandline locks in three sales contracts for Coburn April 20, 2020
Strandline delivers 70% boost to ore reserve at Coburn April 16, 2019

Aerial view:

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