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Australia
Mulga Rock Project

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 Location:
200 km NE from Kalgoorlie, Western Australia, Australia

  Project Contacts:
Level 1 502 Hay Street
PO Box 1770
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Uranium
Mining Method
  • Truck & Shovel / Loader
Mine Life15 years (as of Jan 1, 2022)
Mulga Rock is an advanced Project with a revised DFS underway, to optimise project parameters to include base metal recovery optimisation work, detailed resource definition drilling and mining studies.

Mulga Rock is one of only four projects in Western Australia to receive State Ministerial approval to progress with the mining of uranium and it is currently the only one of those four likely to be developed in the near future.

In December 2021, the Western Australian Department of Water and Environment Regulation provided formal confirmation that “substantial commencement” had been achieved. This notification, together with several approvals and confirmations received in the preceding months, allows the Mulga Rock Project to advance to the next stage of development.


Owners

Source: p. 12
CompanyInterestOwnership
Deep Yellow Ltd. 100 % Indirect

Contractors

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Deposit Type

  • Sediment-hosted


Summary:

The project consists of two separate mining areas over a total length of 30km with the individual deposits ranging in length from 1km to 8km. The Mulga Rock East mining centre comprises the Ambassador and Princess deposits and the Mulga Rock West mining centre comprises the Shogun and Emperor deposits.

The MRP is classed as a carbonaceous-sedimentary hosted, supergene enriched, uranium deposit. Mineralisation is hosted predominantly by unconsolidated Eocene sediments (39 Ma) which are rich in organic matter and comprise river and estuarinelake sediments. The organic matter originated primarily from land-based plant matter that washed into the channels and deposited into tributaries along the edge of an oxbow bend, forming peat.

The uranium mineralisation is hosted by the organic matter in the reduced sediments below the redox front. Most of the uranium is adsorbed onto organic matter in an ionic form (i.e. uranium metal). The remainder of the mineralisation comprises ultra-fine grained uraninite (UO2) and mixed uranium oxides. The individual uranium-rich units consist of stacked lenses that have strong lateral continuity, and are spatially associated with the redox front that coincides with the present-day water table.

Uranium mineralisation is hosted by flat-lying, carbonaceous clastic sediments which are in turn overlain by weathered, oxidised sediments that range in thickness from 19m to 62m of waste overburden.

Most of the u ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Due to the large lateral extent and horizontal geometry of the deposits, Vimy is proposing to use large-scale open pit ‘strip’ mining techniques like those used in mineral sands and other bulk mining operations. Strip mining commences with the excavation of an initial box cut to expose the ore, with the overburden placed in a surface landform. After mining the ore exposed by the first box cut, the resulting pit void is available to take the overburden from the next mining strip as mining moves along strike. In general, mining advances one strip at a time with previously mined areas progressively backfilled and rehabilitated. This mining method will result in ‘realtime rehabilitation’ leading to a smaller environmental footprint and significant savings in waste movement and end of mine life rehabilitation liability.

The regular geometry of the mining operation, with a fixed distance from the active mine face and backfill, lends itself to either a truck and shovel (T&S) operation, or continuous mechanised waste haulage system such as an in-pit crushing and conveying (IPCC) system. Vimy has investigated a number of mechanised mining systems, including drag line, dozer trap, bucket wheel excavator, and IPCC. These mechanised mining options have progressively been eliminated due to excessive capital cost or technical risk. For the purposes of the DFS, it has been determined that an owner-operator T&S operation is the most cost-effective mining approach for the MRP.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:
For the purposes of the Refresh, the Mineral Resource Estimate, Ore Reserves, mine plan and schedule, technical design, and metallurgical flowsheet are unchanged from the 2018 DFS.

CommodityUnitsAvg. AnnualLOM
Uranium (U3O8) M lbs 3.447
All production numbers are expressed as U3O8.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Annual processing rate  ......  Subscription required
* According to 2020 study.
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Reserves at January 30, 2018:
The Ore Reserve is a subset of the Mineral Resource which comprises 90.1Mlbs U3O8 (71.2Mt at 570 ppm U3O8at a cut-off of 150 ppm).

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 22.7 Mt U3O8 845 ppm 42.3 M lbs
Total Resource 71.2 Mt U3O8 570 ppm 90.1 M lbs

Commodity Production Costs:

CommodityUnitsAverage
Cash costs U3O8 USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) U3O8 USD  ......  Subscription required&nbs
Pre-tax break-even price U3O8 USD  ......  Subscription required&nbs
Assumed price U3O8 USD  ......  Subscription required&nbs
* According to 2020 study / presentation.
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2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Total CapEx $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
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Staff:

Total WorkforceYear
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Other 2022
Press Release 2022
Quarterly Report 2022
................................... Subscription required 2020
................................... Subscription required 2020
Feasibility Study Report 2018
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