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Australia
Century Mine

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 Location:
270 SW from Karumba, Queensland, Australia

  Address:
360 Collins Street Level 4
Melbourne
Victoria, Australia
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeTailings
Commodities
  • Zinc
  • Lead
  • Silver
Mining Method
  • Hydraulic mining
Production Start...
Mine Life2027
Management is working on several exploration and development initiatives to extend the operating life at Century beyond the current remaining tailings resource. Development activities at the high-grade Silver King and East Fault Block deposits adjacent to the Century open pit mine is expected to commence. Final Investment Decision (FID) to follow internal and senior debt-finance approvals and debt financing completion targeted for H2 CY2022 with first production in H2 CY2023.

With the potential reintroduction of in-situ mining activities at Century, numerous Life of Asset extension opportunities are being investigated. A blend up strategy is being considered when assessing the potential deposits with the aim of bringing forward higher grade ore to process alongside what will be an extended tailings Life of Mine. The identification and development of additional resources to extend the Life of Asset to 2030 and beyond remains a key focus for the New Century.
Latest NewsSibanye, New Century takeover still on despite mine suspension     March 20, 2023


Owners

Source: p. 28
CompanyInterestOwnership
New Century Resources Ltd. 100 % Indirect
Century Mining Limited (CML), which is 100% owned by New Century, holds all the relevant mining and exploration leases.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Tailings
  • Vein / narrow vein


Summary:

Since acquiring the Century Mine, the Company restarted operations through the reprocessing of the large tailings Ore Reserve on the mine site.

The current tailings Ore Reserve provides base production, with in-situ resources providing additional production. The two in-situ deposits on the mining lease (Silver King and East Fault Block) are located less than 2km from the processing plant and have been used as the feed source for the plant, with two additional deposits on the Company’s leases (South Block and Watson’s Lode) to be assessed for potential mine life extension in due course.

Century Tailings Deposit
A single substantial tailings deposit exists at Century, generated from 16 years of large scale operations from the Century open pit.

Substantial recoverable zinc mineralisation exists in the tailings at Century, due to the historical focus on throughput maximisation as opposed to recovery maximisation. The nature of the original Century ore required extended flotation time and given the scale of the original Century deposit (105Mt at 12% Zn) a high throughput processing plant was constructed, achieving relatively modest recoveries (74% in 2015) over the life of operations.

Three independent metallurgical studies have been completed on the Century Tailings Deposit, demonstrating the tailings may be reprocessed through the existing plant on site with minor modifications to achieve recovery of >60% of remaining zinc minera ........


Mining Methods

  • Hydraulic mining


Summary:

Hydraulic mining of the Century tailings deposit is undertaken via top-down hydraulic mining method. Up to four active water cannons are located on top of the mining bench and use high pressure water to fluidise the tailings. The resultant slurry gravity feeds to a sump, in which multiple submersible pumps transfer the tailing to screen after which it is pumped to the Century concentrator. The mine plan has broken the deposit into 3 horizontal passes, with the hydraulic cannons working in strips and blocks with typical strip widths of 15-20 meters. The floor of the tailings facility will be cleaned up, utilising a combination of hydraulic mining, dozers and excavators. The current mining activities show the appropriateness of the method as the basis of the Ore Reserve.

During the hydraulic mining process, a 300mm material layer will be left on the floor of the deposit, which is accounted as ore loss. Additionally, a dilution of 100mm at the bottom of the deposit for non-tailings material is applied to the resource model. This final layer including the 300mm of ore loss and 100mm of dilution will be removed in the final clean-up pass. A mining recovery of 95.5% has been assumed for all mining blocks removed with the hydraulic cannons which is based on the mine call factor estimated from monthly reconciliation data.

The Optimisation Study referred to in this announcement is an update to the original In-situ Feasibility Study of the potential of combining t ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits20232022202120202019
Zinc Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required
^ Guidance / Forecast.
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Operational Metrics:

Metrics2022202120202019
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required
Annual production capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required500,000 t of zinc concentrate
Annual mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required8 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2022:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 42.8 Mt Zinc 3.1 % 1,332 kt
Proven & Probable 42.8 Mt Lead 0.3 % 133 kt
Proven & Probable 42.8 Mt Silver 17 g/t 24.2 M oz
Measured & Indicated 51.2 Mt Zinc 3.4 % 1,811 kt
Measured & Indicated 51.2 Mt Lead 0.4 % 265 kt
Measured & Indicated 51.2 Mt Silver 19 g/t 34.6 M oz
Inferred 2.3 Mt Zinc 6.5 % 150 kt
Inferred 2.3 Mt Lead 3.1 % 72 kt
Inferred 2.3 Mt Silver 16 g/t 1.2 M oz
Total Resource 53.5 Mt Zinc 3.7 % 1,961 kt
Total Resource 53.5 Mt Lead 0.5 % 337 kt
Total Resource 53.5 Mt Silver 19 g/t 35.8 M oz

Commodity Production Costs:

CommodityUnits202220212020
All-in sustaining costs (AISC) Zinc USD  ......  Subscription required†
C1 cash costs Zinc USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units20222021202020192018
Revenue M AUD  ......  Subscription required  ......  Subscription required
Pre-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -104.6  
EBIT M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M AUD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Pipelines
Source: Subscription required


Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Dozer ....................... Subscription required ....................... Subscription required Jan 1, 2020
Drill ....................... Subscription required ....................... Subscription required Jun 30, 2022
Excavator ....................... Subscription required 180 t ....................... Subscription required Sep 15, 2021
Truck (dump) ....................... Subscription required 170 t ....................... Subscription required Sep 15, 2021
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 24, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
Subscription required - Subscription is required.

Staff:

EmployeesTotal WorkforceYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Fact Sheet 2022
Press Release 2022
Quarterly Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Feasibility Study Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Sibanye, New Century takeover still on despite mine suspension March 20, 2023
Sibanye Takeover Offer – Update March 8, 2023
Sibanye-Stillwater Ltd.: Off-Market Takeover Offer for New Century – Offer Opens and Despatch Complete March 7, 2023
Sibanye makes off-market play for New Century February 22, 2023

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