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Australia
Savannah North Project (Savannah Operation)

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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
  • Filter press plant
  • Flotation
Mine Life8 years (as of Jan 1, 2016)
Underground mining at Savannah North scheduled to resume in August this year.
Latest NewsPanoramic Resources: Perenti wins over $350m in new and extended contracts     February 21, 2020


Owners

Source: p. 95
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

  • Sediment-hosted
  • Metamorphic hosted


Summary:

The Savannah sulphide orebody lies within a marginal norite unit, developed at the base of the Savannah Layered Intrusive Complex (SI) which was intruded into a metamorphosed sequence of sedimentary and igneous rocks called the Tickalara Metamorphics.

The Savannah North mineralisation consists of pyrrhotite, pentlandite and chalcopyrite, ranges from disseminated/matrix to stringer and massive sulphide and dips moderately (40-45 degrees) to the north-west. Two main zones of mineralisation, the Upper Zone, has developed on the basal contact of the Savannah North Intrusion (SNI) and the second, the Lower Zone is a consistent remobilised zone of massive sulphide mineralisation.


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 Nth, 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.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
SAG mill 1

Summary:

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


Processing

  • 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 Recovery Rate, % 86.6
Nickel Head Grade, % 1.26
Copper Recovery Rate, % 94.9
Copper Head Grade, % 0.64
Cobalt Recovery Rate, % 94.2
Cobalt Head Grade, % 0.09

Projected Production:

CommodityUnitsAvg. AnnualLOM
Nickel t 9,50066,200
Copper t  ......  Subscription required  ......  Subscription required
Cobalt t  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics
Ore tonnes mined, LOM 6.07 Mt *
Annual processing capacity 1 Mt *
Annual mining rate 0.9 Mt *
* According to 2016 study.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Probable 6,650,000 t Nickel 1.42 % 94,500 t
Probable 6,650,000 t Copper 0.61 % 40,900 t
Probable 6,650,000 t Cobalt 0.1 % 6,700 t
Indicated 7,168,000 t Nickel
Indicated 7,168,000 t Copper
Indicated 7,168,000 t Cobalt
Inferred 3,105,000 t Nickel
Inferred 3,105,000 t Copper
Inferred 3,105,000 t Cobalt
Total Resource 10,271,000 t Nickel 1.7 % 175,000 t
Total Resource 10,271,000 t Copper 0.72 % 74,300 t
Total Resource 10,271,000 t Cobalt 0.12 % 12,600 t

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs Nickel USD 3.68 / lb *†
C1 cash costs Nickel USD 2.2 / lb *†
Assumed price Cobalt USD 10 / lb *
Assumed price Nickel USD 6 / lb *
Assumed price Copper USD 2.5 / lb *
* According to 2016 study / presentation.
† Net of By-Product.

Operating Costs:

Units2016
OP mining costs ($/t milled) AUD 55 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) AUD  ......  Subscription required
* According to 2016 study.
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of July 31, 2020:
HME TypeModelSizeQuantity
Drill (long hole) ....................... Subscription required 2
....................... Subscription required
....................... Subscription required ....................... Subscription required 3
....................... Subscription required 2
....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 3
....................... Subscription required 1
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 9
....................... Subscription required 1
....................... Subscription required ....................... Subscription required ....................... Subscription required 3
....................... Subscription required 1
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 24, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... 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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