Overview
Stage | Construction |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole open stoping
- Paste backfill
|
Production Start | ...  |
Mine Life | 12 years (as of Jan 1, 2021) |
In FY24 five working levels will be open at Savannah North compared to two at the start of FY23.
In addition, the Savannah extension (an area below the historical Savannah workings) will come into production for the very first time. |
Source:
p. 4
Panoramic Resources Ltd. owns 100% interest in the Savannah North Project through it's wholly owned subsidiary Savannah Nickel Mines Pty Ltd.
Contractors
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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 ........

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 plan ........

Flow Sheet:
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.
Flow Sheet:
Summary:

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Projected Production:
Commodity | Units | Avg. Annual |
Nickel
|
t
| 9,072 |
Copper
|
t
| ......  |
Cobalt
|
t
| ......  |
All production numbers are expressed as metal in concentrate.
Operational Metrics:
Metrics | | |
Ore tonnes mined, LOM
| ......  | |
Tonnes processed, LOM
| ......  | |
Annual ore mining rate
| ......  | 960 kt * |
* According to 2021 study.
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Reserves at September 29, 2022:
Mineral Resource cut-off grade is 0.50% Ni.
Savannah North Ore Reserve average cut-off (NSR) of $135/t.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
8,458,000 t
|
Nickel
|
1.21 %
|
102,700 t
|
Proven & Probable
|
8,458,000 t
|
Copper
|
0.58 %
|
49,400 t
|
Proven & Probable
|
8,458,000 t
|
Cobalt
|
0.09 %
|
7,200 t
|
Inferred
|
4,159,000 t
|
Nickel
|
1.37 %
|
|
Inferred
|
4,159,000 t
|
Copper
|
0.53 %
|
|
Inferred
|
4,159,000 t
|
Cobalt
|
0.08 %
|
|
Total Resource
|
13,876,000 t
|
Nickel
|
1.52 %
|
211,200 t
|
Total Resource
|
13,876,000 t
|
Copper
|
0.69 %
|
95,300 t
|
Total Resource
|
13,876,000 t
|
Cobalt
|
0.1 %
|
13,900 t
|
Commodity Production Costs:
| Commodity | Units | Average |
All-in costs
|
Nickel
|
AUD
|
......
|
Assumed price
|
Cobalt
|
AUD
|
......
|
Assumed price
|
Nickel
|
AUD
|
......
|
Assumed price
|
Copper
|
AUD
|
......
|
* According to 2021 study / presentation.
† Net of By-Product.
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2021 Study Costs and Valuation Metrics :
Metrics | Units | LOM Total |
Initial CapEx
|
$M AUD
|
......
|
Gross revenue (LOM)
|
$M AUD
|
......
|
Pre-tax Cash Flow (LOM)
|
$M AUD
|
......
|
Pre-tax NPV @ 8%
|
$M AUD
|
......
|
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Source:

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