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Australia
Savannah Operation (Copernicus Mine, Savannah Mine, Savannah North Project)

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

  Regional Office:
PMB 19
Kununurra
Western Australia, Australia
6743
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Fax+61-8-9167-8113
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  • Filings & News

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Overview

StatusTemporary Suspension
Mine TypeUnderground
Commodities
  • Nickel
  • Copper
  • Cobalt
Mining Method
  • Longhole open stoping
  • Cemented backfill
  • Paste backfill
Processing
  • Flotation
Mine Life13 years (as of Jan 1, 2020)
Panoramic flags Savannah restart in 2021.
Latest NewsBarminco, RUC Mining progress works for Savannah underground expansion     October 20, 2020


Owners & OPERATOR

Source:
CompanyInterestOwnership
Barminco Holdings Pty Ltd. (operator)
Panoramic Resources Ltd. 100 % Indirect
Savannah Nickel Mines Pty Ltd. 100 % Direct
Panoramic recently handed underground operational management of the Savannah nickel mine to Perenti subsidiary, Barminco.
Under the agreement, Barminco undertakes mine development, production and haulage with approximately 120 employees working at Savannah.

Deposit Type

  • Magmatic
  • MMS


Summary:

Mineralization of Savannah Operations.

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
  • Cemented backfill
  • Paste backfill


Summary:

Savannah
Ore production is undertaken via conventional long hole open stoping with remote bogging on retreat. Currently, the long hole drilling is undertaken by a contractor. Savannah purchased a used Cabletec drilling rig for ground support and as a backup production drill, as required. The mine plan requires open stopes to be backfilled with cemented paste fill to maximise recovery of the orebody and to assist geotechnical stability of the mine.

Savannah North.
Mining Method: Long hole open stoping;
Sub-level interval: 20m;
Minimum stope angle: 50 degrees;
Minimum mining width: 2m;
Stope dilution: 10%;
Stope mining recovery: 95%;
Access: Single decline;
Mining Inventory: 6.07Mt;
Mining rate Average: 0.8-1.0Mtpa.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The Savannah Nickel-Copper-Cobalt Operation consists of a number of nickel sulphide orebodies. The Project infrastructure includes an underground mine, 1.0 million tonne per annum processing plant, paste fill plant, a 180 room village, orkshops, office accommodation, tailings and water storage facilities and other associated infrastructure. The Savannah was constructed in 2003 and commissioned in late 2004 initially sourcing ore from an open pit (Copernicus). After 18 months, the operations transitioned to underground mining.

Over an initial twelve-year period, Savannah milled 8.5 million tonnes at an average grade of 1.29% Ni, 0.65% Cu and 0.06% Co to produce 1.22 million tonnes of concentrate containing 94,600t Ni, 53,000t Cu and 5,000t Co. Savannah was placed onto care and maintenance in May 2016 due to the historically low nickel price.

The process plant at Savannah Operation comprises a single stage crusher, SAG mill, flotation, thickening and filtering s ........

Recoveries & Grades:

CommodityParameter201920162015
Nickel Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Nickel Head Grade, % 1.161.321.18
Nickel Concentrate Grade, %  ......  Subscription required
Copper Recovery Rate, %  ......  Subscription required
Copper Head Grade, % 0.6
Copper Concentrate Grade, %  ......  Subscription required
Cobalt Recovery Rate, %  ......  Subscription required
Cobalt Head Grade, % 0.06
Cobalt Concentrate Grade, %  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityUnits2020201920162015
Nickel t  ......  Subscription required ^  ......  Subscription required9,8458,726
Copper t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cobalt t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201620152014
Ore tonnes mined  ......  Subscription required865,660 t760,335 t
Tonnes milled  ......  Subscription required870,542 t854,794 t
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 1,371,000 t Nickel 1.16 % 15,900 t
Proven 1,371,000 t Copper 0.75 % 10,300 t
Proven 1,371,000 t Cobalt 0.06 % 800 t
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
Proven & Probable 8,021,000 t Nickel 1.37 % 110,400 t
Proven & Probable 8,021,000 t Copper 0.64 % 51,200 t
Proven & Probable 8,021,000 t Cobalt 0.09 % 7,500 t
Total Resource 12,977,000 t Nickel 1.67 % 217,000 t
Total Resource 12,977,000 t Copper 0.77 % 100,100 t
Total Resource 12,977,000 t Cobalt 0.11 % 14,800 t


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Aug 3, 2020
....................... Subscription required ....................... Subscription required Subscription required Aug 5, 2020
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required 2019
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Annual Report 2017
Corporate Presentation 2017
Feasibility Study Report 2017
Press Release 2016
Press Release 2016
Annual Report 2015
Subscription required - Subscription is required.

News:

NewsDate
Barminco, RUC Mining progress works for Savannah underground expansion October 20, 2020
Panoramic flags Savannah restart in 2021 July 31, 2020
Panoramic puts Barminco in control of Savannah March 3, 2020
Panoramic approves Savannah restart July 17, 2018

Aerial view:

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