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Australia
Golden Grove Operation

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 Location:
225 km E from Geraldton, Western Australia, Australia
  Address:
Yalgoo-Ninghan Rd
Yalgoo
Western Australia, Australia
6635
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Zinc
  • Lead
  • Gold
  • Silver
Mining Method
  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse stoping
  • Cemented backfill
  • Dry waste backfill
Production Start...
Mine Life2032
Golden Grove mine is a world class VHMS geological system.

Ramp-up of Golden Grove’s highest-grade orebody Xantho Extended is expected to increase near-term production, with Gossan Valley expected to provide an independent production front from 2026.

Owners

Source: p. 27
CompanyInterestOwnership
Golden Grove Operations Pty Ltd (operator) 100 % Direct
29Metals Limited 100 % Indirect
All tenements of Golden Grove operation are 100% owned and operated by Golden Grove Operations Pty Ltd, a wholly owned subsidiary of 29Metals Limited.

Contractors

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Deposit Type

  • VMS
  • Volcanic hosted

Summary:

The Golden Grove zinc-copper-gold-silver-lead deposits occur within the Warriedar Fold Belt (“WFB”) which is located in the southern part of the Yalgoo-Singleton greenstone belt of the Murchison Province within the Archaean Yilgarn Craton of Western Australia.

The Golden Grove volcanic-hosted massive sulphide (VHMS) mineralisation occurs predominantly within the Golden Grove Formation (“GGF”) and the Scuddles Formation (“SCF”) of the Gossan Hill Group (“GHG”). The GHG lies along the northeast flank of the WFB forming the eastern limb of a regional syncline and has an average thickness of 3km and a strike length of around 28km. The stratigraphy is west facing and dips steeply to the southwest (75-80°); the regional syncline has been cut by extensive northeast trending, steeply dipping dextral faults and a major regional structure, the Mougooderra Fault, is located to the west of Golden Grove.

Zinc and copper mineralisation are largely hosted in the Golden Grove Formation which is divided into six members (GG1-6) based on lithology and alteration. The GGF comprises a footwall sequence of rhyolite flows and tuffs, a host sequence of volcaniclastic litharenites and crystal tuffs, and a hangingwall sequence of felsic lavas. Mineralisation forms a series of steeply dipping lodes with most of the mineralisation occurring in the GG4 and GG6 members of the GGF, with stratiform zinc concentrated principally at the GG6 horizon and copper mineralisation typically l ........

Mining Methods

  • Longitudinal open stoping
  • Longhole open stoping
  • Transverse stoping
  • Cemented backfill
  • Dry waste backfill

Summary:

Development of the Scuddles mine started in 1988 with a decline and shaft sink; production commenced two years later. The Gossan Hill decline was started in 1994 and production commenced in 1998. A number of open pits have been mined in the past for copper and gold ores, but no open pit mining is currently being undertaken.

Scuddles is accessed via a 630m shaft and a 1 in 7 gradient decline to a depth of 1,105m with deep drilling having identified ore grade mineralisation to depths of around 1,950m; Gossan Hill to the south is accessed by decline only, to a current depth of around 1,370m at Hougoumont and 1,437m at Xantho. The decline branches off to provide access to the two major current producing orebodies, Xantho and Hougoumont; deep drilling has identified ore grade mineralisation to depths of around 2,180m.

Gossan Hill is currently the primary source of ore, which is hauled to the surface via the decline, stockpiled at the Gossan Hill ROM, crushed and conveyed around 3km by surface conveyor to the processing plant adjacent to the Scuddles shaft; ore from Scuddles is crushed underground and hoisted to the surface by skips operating in the main shaft.

Production in the last two years came from a total of eight ore zones mined at Gossan Hill and Scuddles. The major ore producer over the last two years has been Hougoumont, with 30-40% of production coming from this ore zone. Xantho has been the next most significant ore source contributing ........

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits202320222021202020192018
Copper Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required35
Zinc Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Equivalent Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required66
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202320222021202020192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,442,124 dmt1,372,749 dmt1,214,960 dmt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required1,377,340 dmt1,291,440 dmt1,248,496 dmt
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1.7 Mt1.7 Mt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2022:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 15.1 Mt Copper 1.7 % 260 kt
Proven & Probable 15.1 Mt Zinc 4.9 % 744 kt
Proven & Probable 15.1 Mt Lead 0.2 % 37 kt
Proven & Probable 15.1 Mt Gold 0.7 g/t 330 koz
Proven & Probable 15.1 Mt Silver 26 g/t 12,685 koz
Total Resource 61.4 Mt Copper 1.7 % 1,027 kt
Total Resource 61.4 Mt Zinc 4 % 2,473 kt
Total Resource 61.4 Mt Lead 0.2 % 153 kt
Total Resource 61.4 Mt Gold 0.7 g/t 1,284 koz
Total Resource 61.4 Mt Silver 28 g/t 56,213 koz

Commodity Production Costs:

CommodityUnits20222021202020192018
All-in sustaining costs (sold) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.57 / lb†  
C1 cash costs Zinc USD
C1 cash costs Copper USD
C1 cash costs (sold) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -1.9 / lb†  
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202020192018
UG mining costs ($/t mined) AUD 97.5  88.9  88.7  
Processing costs ($/t milled) AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
G&A ($/t milled) AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units202320222021202020192018
Capital expenditures (planned) M AUD  ......  Subscription required
Growth Capital M AUD  ......  Subscription required  ......  Subscription required
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required
Capital expenditures M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 44  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 402.4  
Gross profit M AUD  ......  Subscription required  ......  Subscription required 150.4  
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required 132.5  
After-tax Income M AUD  ......  Subscription required  ......  Subscription required 88.2  
EBIT M AUD  ......  Subscription required  ......  Subscription required 143.3  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 187.4  
Subscription required - Subscription is required

Water Supply
Source: Subscription required

- subscription is required.

Heavy Mobile Equipment as of September 14, 2023:
HME TypeModelQuantityLeased or
Contractor
ANFO Loader ....................... Subscription required ....................... Subscription required Leased
Cable bolter ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Truck (underground) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Report 2022
Corporate Presentation 2022
Sustainability Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Project Description 2017
Annual Report 2016
Quarterly Report 2016
Year-end Mineral Reserves 2016
Fact Sheet 2015
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