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Australia
Mt Charlotte Mine (Kalgoorlie Consolidated Gold Mines (KCGM) Operation)

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 Location:
0 km E from Kalgoorlie-Boulder, Western Australia, Australia

  Address:
Black Street PMB 27
Kalgoorlie
Western Australia, Australia
WA 6433
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WebsiteWeb
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  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level caving
  • Longhole open stoping
  • Avoca
  • Backfill
Production Start...
Mine Life2026


Owners

Source: p. 150
CompanyInterestOwnership
Northern Star Resources Ltd. 100 % Indirect
Kalgoorlie Consolidated Gold Mines Pty Ltd. (operator) 100 % Direct

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

The stratigraphy covered by the KCGM tenements consists of a basal ultramafic unit called the Hannan Lake Serpentinite. This ultramafic unit is overlain successively by the high magnesian Devon Consols Basalt, Kapai Slate, tholeiitic Paringa Basalt and the Black Flag sediments. Differentiated zones of dolerite and gabbro texture occur within the mafic sequence. The Golden Mile Dolerite, hosting the bulk of the Golden Mile and Mount Charlotte gold mineralisation, is a strongly differentiated layered gabbro, approximately 700m in thickness. The Golden Mile Dolerite is situated conformably between the Paringa Basalt and the Black Flag sediments. This entire stratigraphic sequence is intruded by numerous porphyry dykes of intermediate to felsic composition. The Mt Charlotte style gold mineralisation is hosted within the Golden Mile Dolerite and is predominantly associated with pyrite in carbonate alteration haloes around quartz veins, with a minor proportion as relatively coarse free gold within the veins, commonly close to their margins. The veins vary in width from a few millimetres to a maximum of about two metres but are commonly between two centimetres and 50 cm wide. The vein spacing varies from 20 cm to tens of metres but is typically from 50 cm to two metres in areas mined as ore. Quartz is the dominant vein-fill mineral; accessory vein minerals include calcite, ankerite, scheelite, pyrite, pyrrhotite, and gold. The Hidden Secret style gold mineralisation is hosted wit ........


Mining Methods

  • Sub-level caving
  • Longhole open stoping
  • Avoca
  • Backfill


Summary:

Mt Charlotte Underground Mine
The Mt Charlotte underground mine is accessed via a portal within the Fimiston Pit (Super Pit) and the Cassidy Shaft. Production in Mt Charlotte is carried out utilising a combination of remnant Sublevel caving, modified Avoca and conventional longhole open stoping. In most cases, active and historic stopes are backfilled with development waste to save haulage costs.

The main Mt Charlotte orebodies are worked by sub-level caving; the dimensions and ground support for the mill-holes and access drives are determined using the rock mass Q value and structural information. Hidden Secret is mined using a combination of modified Avoca and Avoca mining methods; stope dimensions and backfilling requirements are determined using hydraulic radius and Q value, modified by location of major structures and rock mass changes.

Underground operations at Mt Charlotte are subject to mine seismicity. The mechanisms for seismic activity are well understood, and a combination of careful extraction sequencing and appropriate ground support in access drives is used to limit stress build-up (and thus event magnitude) and minimise damage from those seismic events which do occur.

Dilution factors are updated when there is sufficient data to do so and are based on the historical performance of each mining block and evaluation of the geotechnical block model. Average stope dilution specific to mining method and ranges from 10% to 20%.


Crushing and Grinding
Flow Sheet: Source

Two milling circuits, the Fimiston and the Mt Charlotte. The Fimiston circuit comprises a semiautogenous grinding (SAG) mill and a pebble crushing circuit with two secondary ball mills. The Mt Charlotte circuit is a single SAG mill and ball mill.


Processing

Flow Sheet: Subscription required

Summary:

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Production:
2020 production numbers reflect production for seven months period from December 2019 to June 2020. Saracen acquired 50% stake in the KCGM JV in late of November 2019.

CommodityUnits202220212020
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,016 kt904 kt1,042 kt
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Reserves at March 31, 2022:
The adopted cut-off grades for Mineral Resource Estimation reporting are 1.25g/t for Underground Resources, these have been derived from current mining costs and parameters at $2,250/oz.

CategoryTonnage CommodityGradeContained Metal
Probable 17,839 kt Gold 2 g/t 1,174 koz
Indicated 49,440 kt Gold 2.2 g/t 3,497 koz
Inferred 54,758 kt Gold 2.4 g/t 4,277 koz
Total Resource 104,198 kt Gold 2.3 g/t 7,774 koz

Operating Costs:

Units2019201820172016
UG mining costs ($/t mined) USD 3844.534.732.1


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 30, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Corporate Presentation 2022
Quarterly Report 2022
Year-end Mineral Reserves 2022
................................... 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 10-K 2018
Other 2017
Quarterly Report 2017
Other 2014
Other 2006
Other 2006
Annual Report 1966
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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