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Portugal
Mina do Barroso Project

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 Location:
85 km NE from Porto, Portugal

  Project Contacts:
Salisbury House London Wall
London
United Kingdom
EC2M 5PS
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Lithium
  • Spodumene
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
  • Dense media separation
Mine Life11 years (as of Jan 1, 2019)


Owners

Source: p. 17
CompanyInterestOwnership
Savannah Resources Plc 100 % Indirect
n June 2019 the Group completed the acquisition of the minority 25% stake in the operating subsidiary, Savannah Lithium Lda which allowed the Group to take sole ownership of the Mina do Barroso project.

Deposit Type

  • Pegmatite


Summary:

The Barroso – Alvão Region is characterized by the presence of a large field of several dozen pegmatite and aplite-pegmatite dykes of granitic composition. Pegmatite dykes are mainly intruded in the granitic rocks of the region whilst aplite-pegmatite dykes are hosted by low- to medium-grade metasedimentary rocks of Silurian age that are strongly deformed (B. CHAROY et al.,1992). The thickness of these dykes ranges from less than 1m up to 50m.

The Li-rich aplite-pegmatite dykes show a spatial distribution of 3 sub-types (LIMA et al, 2003):
- Spodumene-rich aplite-pegmatite dykes and sills are dominant at N and NE regions;
- Petalite-rich are dominant at SW; and
- Lepidolite-rich occur at NW regions.

The Mina do Barroso Project is centred on a series of spodumene rich aplite-pegmatite dykes and sills which have formed the basis of this study.

Grandao Deposit: Mineralised zone over 500m long, 450m wide and pegmatite depths of up to 50m. Results from recent drilling has recorded the broadest and most significant results for the Project to date.

Reservatorio Deposit: Drilling has confirmed that the lithium mineralisation extends to over 400m strike length, with good down dip extensions of at least 100m.

NOA Deposit: Drilling has confirmed the presence of lithium mineralisation over a 200m strike length together with good down dip extensions of at least 50m.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Mina do Barroso project will have four surface workings/open pits: Grandao, Pinheiro, Reservatorio and NOA. [July 2020, The Mina do Barroso Project Economic and Development Impacts, p.21]

Mining Inventory
Conceptual open pit mine planning for the Mina Do Barroso Lithium Project was developed targeting an annual plant feed rate of 1.3Mtpa with an estimated average over the life of mine mill head grade of 1.02 %Li2O (diluted), with an average overall strip ratio of 5.2:1 (waste:ore ratio) and a resultant eleven plus year life of mine (LOM).

Three geological block models (one for each respective deposit) were provided and conceptual pit shells were generated using an optimisation software founded on the Lerchs Grossman algorithm.

The Mina do Barroso total site conceptual infrastructure stretches 5 km by 2.5 km over relatively steep and undulating terrain. All conceptual mine infrastructure and excavations developed in this study were restricted to:
- within tenement boundaries;
- minimised sterilisation of prospective target exploration zones;
- respected offset boundaries for major watercourses; and
- legacy travel routes (where available).

As the Project progresses further refinements to haul routing plans, waste rock storage management and pit staging should be targeted to take advantage of opportunities for reduced haulage capital and operating costs.

Quantities of bulk pegmatite are also included in the production plan as valuable material below the cut-off grade to be stockpiled and sold. A total of 2.7 Mt of this material has been identified.

Based on standard equipment production capacities the fleet is estimated to comprise:
- 120t excavator (year 5-11)
- 80t excavator (year 1-4)
- 60t excavator
- 60t dump trucks (year 1-4)
- 90t dump trucks (year 5-11)
- 45t Dozers
- Graders
- Water cart
- Hydraulic drill rigs.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
High Pressure Grinding Rolls (HPGR)


Processing

  • Flotation
  • Dense media separation

Flow Sheet: Subscription required

Summary:

The processing of ore to produce concentrates will comprise several stages:
- Crushing: Multiple stage crushing and then milling utilising high-pressure grind rollers “HPGR” to a P80 -4mm/+0.5mm to prepare the ore to be to be fed to a DMS Circuit;
- Dense Media Separation Circuit: The DMS circuit will separate material based on its specific gravity, using fine ferrosilicon as a separation medium. The middling and tailing streams from the DMS circuit are directed to the ball mill circuit for fine grinding in preparation for floatation;
- Fine Grinding Circuit: The fine grinding circuit will reduce material produced by the DMS to a final product size of P80 =106 µm, suitable for flotation;
- Flotation Circuit: The milled ore will be subjected to four stages of spodumene flotation to recover a spodumene concentrate including one rougher stage and three cleaner stages. A conventional flotation methodology will be used;
- Tailings: Pulp discharged from the tailings ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Spodumene Recovery Rate, %  ......  Subscription required
Spodumene Head Grade, % 1.07
Spodumene Concentrate Grade, %  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:
Life of Mine Low Grade Bulk Pegmatite production is 2.7 Mt.

CommodityProductUnitsAvg. Annual
Spodumene Concentrate kt 175
Quartz Mineral t  ......  Subscription required
Feldspar Mineral t  ......  Subscription required
LCE kt  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio 5.2 *
Waste tonnes, LOM 75.4 Mt *
Ore tonnes mined, LOM 14.4 Mt *
Tonnes milled, LOM 14.4 Mt *
Annual milling rate 1.3 Mt *
* According to 2018 study.
Subscription required - Subscription is required.

Reserves at May 31, 2019:
Cut-off grade of Li2O is 0.5%. Lithium cut-­off grade does not apply for quartz and feldspar.

CategoryTonnage CommodityGradeContained Metal
Measured 6.6 Mt Li2O 1.1 % 71,600 t
Measured 7.1 Mt Quartz 32.6 % 2.32 Mt
Measured 7.1 Mt Feldspar 42.8 % 3.05 Mt
Measured 6.6 Mt Fe2O3 0.7 %
Indicated 8.4 Mt Li2O 1 % 86,700 t
Indicated 6.3 Mt Quartz 34.6 % 2.17 Mt
Indicated 6.3 Mt Feldspar 42.6 % 2.67 Mt
Indicated 8.4 Mt Fe2O3 0.7 %
Inferred 12 Mt Li2O 1.1 % 127,600 t
Inferred 1 Mt Quartz 30.9 % 0.3 Mt
Inferred 1 Mt Feldspar 40.3 % 0.39 Mt
Inferred 12 Mt Fe2O3 0.9 %
Total Resource 27 Mt Li2O 1.06 % 285,900 t
Total Resource 27 Mt Fe2O3 0.8 %
Total Resource 14.4 Mt Quartz 33.4 % 4.79 Mt
Total Resource 14.4 Mt Feldspar 42.6 % 6.11 Mt

Commodity Production Costs:

CommodityUnitsAverage
C1 cash costs Spodumene USD 271 / t *†
Assumed price Feldspar USD 39 / t *
Assumed price Quartz USD 33 / t *
Assumed price Spodumene USD 685 / t *
* According to 2018 study / presentation.
† Net of By-Product.

Operating Costs:

Units2018
OP mining costs ($/t mined) USD 3.16

2018 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 240.9
G&A costs $M USD 35.9
Total OpEx $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of June 14, 2018:
HME TypeSize
Dozer 45 t
....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 20, 2020
....................... Subscription required ....................... Subscription required Sep 20, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Feasibility Study Report 2018
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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