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Australia
DeGrussa Operation

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 Location:
148 km NW from Wiluna, Western Australia, Australia
  Address:
Level 2, 10 Kings Park Road
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
Fax+61-8-6430-3849
WebsiteWeb
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Gold
  • Silver
Mining Method
  • Cut & Fill
  • Sub-level open stoping (SLOS)
  • Longhole open stoping
  • Transverse open stoping
  • Longitudinal stoping
  • Cemented backfill
  • Dry waste backfill
Production Start...
Mine Life2023
The DeGrussa Operations includes both the DeGrussa and Monty Copper-Gold Mines.

With the depletion of run-of-mine (ROM) sulphide ore during October 2022, underground mining operations have been completed at the DeGrussa operations.

Processing for the December 2022 continued to be in line with plan. Processing of ROM stockpiles was completed in October 2022, after which the 1.6Mtpa DeGrussa Concentrator transitioned to processing transitional stockpiles and mineralised waste stockpiles.

In December 2022 Sandfire commenced the DeGrussa Processing Extension Project, initially based on processing transitional stockpiles and mineralised waste stockpiles remaining on-site at the end of ROM operations.

Owners

Source: p. 11
CompanyInterestOwnership
Sandfire Resources Ltd. 100 % Indirect
DeGrussa Copper Operations is 100% owned by Sandfire Resources.

Contractors

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Deposit Type

  • VMS

Summary:

The DeGrussa Operations includes both the DeGrussa and Monty Copper-Gold Mines.

DeGrussa
The DeGrussa Mine lies within the Proterozoic-aged Bryah rift basin that is enclosed between the Archaean Marymia Inlier to the north and the Proterozoic Yerrida basin to the south. The principal exploration targets in the Doolgunna Project area are Volcanogenic Hosted Massive Sulphide (VHMS) deposits located within the Proterozoic Bryah Basin of Western Australia. The style of mineralisation is considered to be from VHMS mineralisation.

The DeGrussa sulphide lode generally strikes towards NE with a strike length of approximately 230m, very steeply dipping towards the south with a plunge generally trending SW and having a vertical extent of about 180m.

The Conductor 1 orebody lies north of DeGrussa and generally strikes ENE dipping approximately 65° to the SE with a high-grade plunge trending SW. It has a strike length of about 540m with a vertical extent of 420m.

Conductor 4 orebody lies to the east of DeGrussa and Conductor1 and are stratigraphically deeper. They have an overall strike length of 470m and vertical extent of 260m. The upper sulphide lode strikes towards ENE with an approximate dip of 47° to the SE and high-grade plunge trending SE. The lower sulphide lode strikes E, dipping approximately 45° to the S with a SW high grade plunge.

Conductor 5 orebody is east of Conductor 4 and has a strike length up to 380m and a v ........

Mining Methods

  • Cut & Fill
  • Sub-level open stoping (SLOS)
  • Longhole open stoping
  • Transverse open stoping
  • Longitudinal stoping
  • Cemented backfill
  • Dry waste backfill

Summary:

With the depletion of run-of-mine (ROM) sulphide ore during the Quarter, underground mining operations have been completed at the DeGrussa operations. Production was sourced from the DeGrussa and Monty Mines with the mine remaining in balance between production and back-fill. Mine production rates from DeGrussa were slightly lower than planned due to contractor equipment and manning constraints. Monty mine production rates continued to exceed forecast. The mining operations strategy adopted for the DeGrussa and Monty operations targets the blending of the material from both mines and scheduling to have both life of mine plans completed as close to the same time as practicable. The updated underground Ore Reserve continues to support this strategy with DeGrussa producing approximately 1.2Mtpa and Monty producing approximately 0.4Mtpa. DeGrussa Mine The underground mining method is long-hole open stoping (both transverse and longitudinal) with minor areas of jumbo cut and fill or uphole benching in some of the narrower areas. The primary method of backfill is paste fill. The sequence aims for 100% extraction of the orebody. Primary mining methods employed are sub-level open stoping (SLOS) and long-hole open stoping (LHOS) with fill. Cut and fill techniques are also employed in remnant areas. Primary fill material is paste with minor use of cemented rock fill and rock fill when appropriate. Monty Mine The underground mining method is long-hole open stoping (both transvers ........

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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^ Guidance / Forecast.

Production:

CommodityProductUnits2023202220212020201920182017
Copper Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required143148
Copper Concentrate kt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required268275
Gold Metal in concentrate oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required
Copper Payable metal M lbs  ......  Subscription required
Gold Payable metal oz  ......  Subscription required
Silver Payable metal koz  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,624,988 t1,665,860 t1,530,301 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required1,619,714 t1,641,244 t1,623,952 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1.6 Mt1.6 Mt
^ Guidance / Forecast.
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Reserves at December 31, 2020:
Mineral Resource for DeGrussa and Monty are based on a 1.0% Cu cut-of.
Ore Reserve include mining dilution and mining recovery.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 2.6 Mt Copper 4.7 % 120 kt
Proven & Probable 2.6 Mt Gold 1.4 g/t 117 koz
Total Resource 2.8 Mt Copper 5.8 % 164 kt
Total Resource 2.8 Mt Gold 1.9 g/t 170 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Copper USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required
C1 cash costs Copper USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required
C1 cash costs Copper USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.93 / lb†   0.93 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 596.2  AUD 513.2  AUD
After-tax Income M  ......  Subscription required  ......  Subscription required
EBIT M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 226.3  AUD 158.5  AUD
EBITDA M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M  ......  Subscription required
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Pipelines
TypeMaterialDiameterLengthDescription

Heavy Mobile Equipment as of October 3, 2022:
HME TypeModelQuantityLeased or
Contractor
Drill ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Explosives Charger ....................... Subscription required ....................... Subscription required Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Leased
Truck (underground) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 3, 2022
Subscription required - Subscription is required.

Staff:

ContractorsTotal WorkforceYear
Subscription required Subscription required 2022
Subscription required Subscription required 2021
Subscription required Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Half-year Report 2023
Press Release 2023
Annual Report 2022
Corporate Presentation 2022
Financial Review 2022
................................... 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 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Corporate Presentation 2017
Feasibility Study Report 2017
Annual Report 2016
Fact Sheet 2016
Corporate Presentation 2015
Other 2015
Other 2015
Project Description 2013
Project Description 2012
Press Release 2011
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