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Australia
Savannah North Expansion Project (Savannah)

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 Location:
104 km N from Halls Creek, Western Australia, Australia

  Project Contacts:
PMB 19
Kununurra
Western Australia, Australia
6743
Phone  ...  Subscription required
Fax+61-8-9167-8113
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Nickel
  • Copper
  • Cobalt
Mining Method
  • Longhole open stoping
  • Paste backfill
Processing
  • Dewatering
  • Filter press plant
  • Flotation
Mine Life12 years (as of Jan 1, 2021)
Latest NewsPanoramic Resources: Perenti wins over $350m in new and extended contracts     February 21, 2020


Owners

Source: p. 97
CompanyInterestOwnership
Panoramic Resources Ltd. 100 % Indirect
Panoramic Resources Ltd. owns 100% interest in the Savannah North Project through it's wholly owned subsidiary Savannah Nickel Mines Pty Ltd.

Deposit Type

  • Magmatic
  • MMS


Summary:

Savannah mineralisation.
The original Savannah sulphide rich nickel, copper and cobalt orebody is hosted by the layered mafic-ultramafic Savannah Intrusion which is enveloped by aluminous metasediments and para-gneisses of the Tickalara Metamorphics. The Savannah Orebody is mostly confined to a marginal norite unit up to 40 metres thick developed above the base of the intrusion. Areas of massive, matrix and disseminated sulphide mineralisation, dominated by pyrrhotite, chalcopyrite, pentlandite and minor pyrite occur throughout the marginal norite unit.

Prior to the development of the Savannah Open Pit, the marginal norite unit outcropped as a prominent 250 metre long limonite-goethite gossan with fresh sulphide mineralisation developing approximately 20 metres below surface. At approximately 500 metres below the surface, a significant sub-horizontal fault, the 500 Fault, cuts the orebody and offsets it 200 metres to the northwest. A similar fault at approximately 900 metres below surface, the 900 Fault, offsets the orebody a further 250 metres to the northwest. Mineralisation above the 500 Fault is referred to as the “Upper Zone”, between the 500 and 900 faults as the “Lower Zone” and below the 900 Fault as the “sub 900 Fault Zone”.

Savannah North mineralisation.
The SNM (Savannah North mineralisation) is based on mining ore associated with the Savannah Intrusion; a palaeo-proterozoic mafic/ultramafic magma conduit. The Ni-Cu-Co rich massive sulphide mineralisation occurs as “classic” magmatic breccias developed about the more primitive, MgO rich basal parts of the conduit.

Magmatic Ni-Cu-Co sulphide Resources hosted by the Savannah North Intrusion (SNI) located to the north of the Savannah Mine.

The Savannah North mineralisation dips moderately (40- 45 degrees) to the north-west and comprises two main zones, the Upper Zone is developed on the basal contact of the North Olivine Gabbro, the second Lower Zone is a consistent remobilised zone of massive sulphide mineralisation, in part associated with the 500 Fault. Both zones are well defined by the drilling and the interpretation is considered sufficiently robust for resource modelling. Additional minor mineralised zones include 5 domains in the hanging wall position to the Upper Zone and a minor mineralized sub-vertical fault.

The Savannah North mineralisation has been defined over a strike length of approximately 1 kilometre with clear indications from geophysics it could extend over 2km. The Resource relates to an area with a strike length of 1,010m from 5,350mE to 6,360mE and extends from 750m to 1,750m below surface with an average domain thickness of approximately 5 metres.


Mining Methods

  • Longhole open stoping
  • Paste backfill


Summary:

The mining methods utilised in the LOM plan is in line with the previous operation being a top-down, long hole open stoping mining method utilising paste fill. This mechanised, non-entry method has proven to be a safe, productive mining method at Savannah.

The total global average planned and unplanned stope dilution (i.e. mined material without Resource classification, including fill dilution) proportion within the Mine Plan stope shapes is 22%.

Mining recoveries of 90% were applied to stopes to allow for issues such as local orebody spatial variability and material left behind during remote loading. A mining recovery of 100% was assumed for ore development.

An undiluted stope minimum mining width (MMW) of 3.0 m (true width) was applied to the Savannah Nth mining area. This is achievable based on the sub-level interval of 20 m floor to floor as from knowledge gained in the mining of the Savannah orebody.

Drill and blast assumptions have been based on historical performance at Savannah. Long hole size is 89 mm diameter and drill metres are based on 6 t / drill m including slotting.

The existing fill system will be utilised for paste filling of the Savannah North stopes. A new paste fill hole is planned for the Savannah North, to be drilled from the surface via 1570DD. Dump valves shall be installed at intervals of 200 vertical metres to protect the paste line in case of paste blockages. Additionally, a backup hole is planned to be drilled to mitigate the risk of downtime due to unexpected blockages. Where opportunities arise, waste rock will be backfilled into stopes either via a dedicated truck fill pass or by loader. When back filling with a loader, truck tipping bays will be mined and loaders will be used to transfer the waste into the stope with an appropriate stop-log. The study assumes that all stopes are paste filled. A cement strength of 2.7% was assumed for all paste placed.

The Savannah mine is accessed through a conventional ramp (decline) of 1:7 gradient and dimensions of 5.2 mW x 5.8 mH. Primary access to Savannah Nth from the Savannah decline is via a splinter decline from the 1452 mRL, consisting of two ramps, one for vehicle access and a second for a return air drive (RAD). The 1570 mRL drill drive also forms part of the access to the Savannah Nth.

Mine scheduling has been adjusted with the objective of ramping up ore production to 960,000t per annum as quickly as possible. Ore sourced from Savannah North underpins the potential restart strategy, with scheduling of ore from Savannah remnants limited to a maximum of 25,000t per month.


Crushing and Grinding
Flow Sheet: Source

Savannah ore has been successfully treated through SAG mill since commissioning in 2004.

Subsequent to the restart further works were completed including the replacement of the Jaw crusher and SAG mill motor. A full set of filters plates is onsite ready for installation.


Processing

  • Dewatering
  • Filter press plant
  • Flotation

Flow Sheet: Subscription required

Summary:

The Savannah processing plant consists of conventional crushing, grinding, flotation, and concentrate handling, producing a bulk nickel-copper-cobalt concentrate for sale to third-party.

The nominal throughput capacity of the Savannah plant is approximately 1.0Mtpa.

The Savannah mine has a long history of concentrate production, sales, recovery, and treatment costs. The assumptions used for the Ore Reserves are based on the recent actuals for these items. No secondary credits have been modelled in the updated Mine Plan, other than from the copper and cobalt included in the NSR calculation. The concentrate produced at the Savannah mine is a “clean concentrate” and does not have any deleterious elements that attract payment penalties.

Recoveries & Grades:

CommodityParameterAvg. LOM
Nickel Head Grade, % 1.23
Copper Head Grade, % 0.54
Cobalt Head Grade, % 0.08

Projected Production:

CommodityUnitsAvg. Annual
Nickel t 9,072
Copper t  ......  Subscription required
Cobalt t  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics
Ore tonnes mined, LOM  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual ore mining rate  ......  Subscription required  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Mineral Resource cut-off grade is 0.50% Ni.
Savannah North Ore Reserve average cut-off (NSR) of $135/t.

CategoryTonnage CommodityGradeContained Metal
Proven 3,028,000 t Nickel 1.1 %
Proven 3,028,000 t Copper 0.59 %
Proven 3,028,000 t Cobalt 0.07 %
Probable 5,246,000 t Nickel 1.28 %
Probable 5,246,000 t Copper 0.57 %
Probable 5,246,000 t Cobalt 0.09 %
Proven & Probable 8,274,000 t Nickel 1.23 % 101,800 t
Proven & Probable 8,274,000 t Copper 0.59 % 48,500 t
Proven & Probable 8,274,000 t Cobalt 0.08 % 7,000 t
Total Resource 10,976,000 t Nickel 1.55 % 170,300 t
Total Resource 10,976,000 t Copper 0.64 % 71,100 t
Total Resource 10,976,000 t Cobalt 0.1 % 11,600 t

Commodity Production Costs:

CommodityUnitsAverage
All-in costs Nickel AUD  ......  Subscription required *†
Assumed price Cobalt AUD  ......  Subscription required *
Assumed price Nickel AUD  ......  Subscription required *
Assumed price Copper AUD  ......  Subscription required *
* According to 2021 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of July 31, 2020:
HME TypeModelSizeQuantityLeased or
Contractor
Drill (long hole) ....................... Subscription required 110 kW ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
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....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 30, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 30, 2021
....................... Subscription required ....................... Subscription required Subscription required Nov 30, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2017
Press Release 2017
Corporate Presentation 2016
Press Release 2016
Subscription required - Subscription is required.

News:

NewsDate
Panoramic Resources: Perenti wins over $350m in new and extended contracts February 21, 2020
Panoramic Resources: Barminco secures Savannah contract with Panoramic January 30, 2020

Aerial view:

Subscription required - Subscription is required.

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