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Australia
Hellyer Mine

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 Location:
66 km SW from Devonport, Tasmania, Australia

  Regional Office:
Level 6, 9 Beach Road
Surfers Paradise
Queensland, Australia
4217
Phone  ...  Subscription required
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeTailings
Commodities
  • Lead
  • Zinc
  • Silver
  • Gold
Mining Method
  • Dredging
Processing
  • Filter press plant
  • Flotation
Mine Life10 years (as of Jan 1, 2018)
In October 2018 retreatment of tailings from the main tailings dam began and site rehabilitation commenced.
Latest NewsEnviroGold Global to reprocess Hellyer Gold Mines tailings in Tasmania     February 22, 2022


Owners

Source: p. 9
CompanyInterestOwnership
NQ Minerals Plc. 100 % Indirect
Hellyer Gold Mines Pty Ltd. (operator) 100 % Direct
NQ Minerals (NQM) holds a consolidated granted mining lease CML103M/1987 over the area including the tailings dam and the processing plant. This lease covers all the areas required for the tailings reclaim operations. The mining lease is held by Hellyer Gold Mines Pty Ltd (HGM), a wholly owned subsidiary of NQM.

Deposit Type

  • Tailings


Summary:

The Hellyer deposit is a volcanic hosted polymetallic massive sulphide deposit located within the Mount Read volcanic arc of western Tasmania. Mineralisation is sulphide hosted and comprised predominantly of pyrite, with lesser sphalerite, galena and arsenopyrite. The pyrite must be carefully managed when exposed to air to prevent its oxidation and potential to form acid mine drainage issues. The economic metals mined at Hellyer were lead, zinc, copper, gold and silver. The Hellyer deposit was mined by underground methods during the period 1989 to 2000. The Fossey deposit extends down plunge from the Hellyer deposit and was mined by Bass Metals between 2010 and 2012.

Tailings from the mill were deposited in a depression approximately 1 km to the west of the Hellyer mill. The tails were inundated with water to prevent oxidation of the sulphide species present in the tails. The tails are typically stratified, having been deposited from discharge pipes set around the dam. The sedimentary stratification is also reflected in a mild gradient in grades of Zn and Pb, with grades typically higher in the deeper parts of the tails and decreasing as the depth of the tails sediments shallow. The tails sediments are unconsolidated.


Mining Methods

  • Dredging


Summary:

The mining method of using a cutter suction dredge to excavate tailings material and transport it to shore via a floating pipeline, was the method used from September 2018 and remains the method used today and forecast for the remaining LOM at Hellyer. The dredged material is delivered to surge tanks via trommel screens to remove debris in the form of oversize rocks and timber and other vegetable matter. From these surge tanks the material is pumped via 300 mm diameter high-density polyethylene (HDPE) pipelines to the processing plant.

Mining is now exclusively by suction cutter dredge; there is no hydraulic mining.

To maintain a feed rate of 100,000 tpm and more, given the potential of greater throughput in the processing plant following alterations to the flotation circuit, a second dredge is to be utilised. This second unit will not only ensure steady feed rates with less interruptions for maintenance and unforeseen downtime events, the second dredge unit permits blending of feed material to the process plant.

The use of this second dredging unit will enhance the project in two ways: it will cover any extended production losses from any major dredge downtime and it provides the ability to blend grades from different mining blocks to smooth out the grade of material delivered to the process plant. Feed of consistent grade material, without peaks and troughs, allows finer tuning of the process plant and improved metal recovery. It is proposed to increase the plant throughput in increments to 180 tph (tonnes per operating hour) by March 2021. The second dredge unit, coupled with the existing primary surge tanks, will ensure that this schedule is met.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 60" x 48" 1
SAG mill ....................... Subscription required 6.7m x 2.4m 2100 kW 1
Ball mill ....................... Subscription required 4.6m x 6.1m 2100 kW 1
Vertical mill / Tower 335 kW 3

Summary:

Currently in use:
1 x Ball mill – Allis Chalmers 4.6 m x 6.1 m, 2,100 kW;
3 x Vertical tower mills – Kubota, 335 kW each.

In addition, the following process equipment was on site and could be used in future operations:
- 1 x 60x48 Kemco primary jaw crushing plant.
- 1 x SAG mill – Allis Chalmers 6.7 m x 2.4 m, 2,100 kW


Processing

  • Filter press plant
  • Flotation

Flow Sheet: Subscription required

Summary:

The processing plant was in reasonable condition and under a maintenance program until February 2018, when refurbishment was begun in preparation for the proposed retreatment project. Refurbishment focused on milling, flotation and regrind circuits, reagents preparation areas, dewatering filters, and tailings.

The major process equipment then available and being used for the tailings included:
• 1 x Ball mill – Allis Chalmers 4.6 m x 6.1 m, 2,100 kW
• 3 x Vertical tower mills – Kubota, 335 kW each
• 3 x 32 m³ High-intensity conditioners, 810 kW each
• 25 x 54 m³ Maxwell flotation tank cells
• 15 x 38 m³ Maxwell flotation tank cells
• 8 x 17 m³ Dorr Oliver trough flotation cells
• 3 x 8.5 m³ Dorr Oliver trough flotation cells
• 10 x 2.5 m³ Agitair trough flotation cells
• 4 x 1 m³ Agitair trough flotation cells
• 2 x Ingersoll Rand, Lasta 60 plate pressure filter presses
• 2 x 20 m diameter thickeners
• 1 x Lime slak ........


Production:
Following modifications to the process plant and a cost benefit analysis to lift production rates, only two final products are now made and sold: lead concentrate and zinc concentrate.

CommodityProductUnits202020192018
Lead Concentrate kt  ......  Subscription required  ......  Subscription required4
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal M oz  ......  Subscription required
Gold Payable metal koz  ......  Subscription required
Pyrite Concentrate kt  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019
Tonnes processed  ......  Subscription required  ......  Subscription required
Annual processing rate  ......  Subscription required  ......  Subscription required1 Mt
Annual processing capacity  ......  Subscription required  ......  Subscription required1.6 Mt
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at August 31, 2020:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Tailings 1.55 Mt Lead 3.45 % 53.4 kt
Proven Tailings 1.55 Mt Zinc 3.44 % 53.3 kt
Proven Tailings 1.55 Mt Silver 98 g/t 4,893 koz
Proven Tailings 1.55 Mt Gold 2.71 g/t 135 koz
Proven Tailings 1.55 Mt Copper 0.21 %
Probable Tailings 4.82 Mt Lead 2.97 % 143 kt
Probable Tailings 4.82 Mt Zinc 2.31 % 111.3 kt
Probable Tailings 4.82 Mt Silver 95 g/t 14,634 koz
Probable Tailings 4.82 Mt Gold 2.57 g/t 398 koz
Probable Tailings 4.82 Mt Copper 0.18 %
Proven & Probable Tailings 6.37 Mt Lead 3.09 % 196.4 kt
Proven & Probable Tailings 6.37 Mt Zinc 2.58 % 164.6 kt
Proven & Probable Tailings 6.37 Mt Silver 96 g/t 19,527 koz
Proven & Probable Tailings 6.37 Mt Gold 2.6 g/t 533 koz
Proven & Probable Tailings 6.37 Mt Copper 0.19 %
Measured Tailings 1.55 Mt Lead 3.45 % 53,400 t
Measured Tailings 1.55 Mt Zinc 3.44 % 53,300 t
Measured Tailings 1.55 Mt Silver 98 g/t 4,893,400 oz
Measured Tailings 1.55 Mt Gold 2.71 g/t 135,000 oz
Measured Tailings 1.55 Mt Copper 0.2 % 3,100 t
Indicated Tailings 4.82 Mt Lead 2.97 % 143,000 t
Indicated Tailings 4.82 Mt Zinc 2.31 % 111,300 t
Indicated Tailings 4.82 Mt Silver 95 g/t 14,634,500 oz
Indicated Tailings 4.82 Mt Gold 2.57 g/t 398,600 oz
Indicated Tailings 4.82 Mt Copper 0.18 % 8,600 t
Inferred Tailings 1.21 Mt Lead 2.6 % 31,500 t
Inferred Tailings 1.21 Mt Zinc 1 % 12,100 t
Inferred Tailings 1.21 Mt Silver 86 g/t 3,345,600 oz
Inferred Tailings 1.21 Mt Gold 2.57 g/t 100,000 oz
Inferred Tailings 1.21 Mt Copper 0.19 % 2,300 t
Total Resource Tailings 7.57 Mt Lead 3.01 % 228,000 t
Total Resource Tailings 7.57 Mt Zinc 2.33 % 176,700 t
Total Resource Tailings 7.57 Mt Silver 94 g/t 22,873,600 oz
Total Resource Tailings 7.57 Mt Gold 2.6 g/t 633,600 oz
Total Resource Tailings 7.57 Mt Copper 0.19 % 14,000 t

Financials:

Units202020192018
Capital expenditures M GBP 11.9  
Revenue M  ......  Subscription required  ......  Subscription required3.2  GBP
Operating Income M  ......  Subscription required  ......  Subscription required
Gross profit M  ......  Subscription required  ......  Subscription required-2  GBP
Subscription required - Subscription is required


Heavy Mobile Equipment as of November 11, 2020:
HME TypeQuantityStatus
Dredge ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required Proposed
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 12, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 12, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 12, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 12, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Environmental Assessment 2018
Financial Review 2018
Other 2018
Press Release 2018
Environmental Assessment 2017
Technical Report 2017
Subscription required - Subscription is required.

News:

NewsDate
EnviroGold Global to reprocess Hellyer Gold Mines tailings in Tasmania February 22, 2022
EnviroGold Global Executes MOU to Reprocess Tailings... November 29, 2021
NQ Minerals declares production milestone at Hellyer January 16, 2019
Hellyer revival to boost Tasmanian mining July 17, 2018

Aerial view:

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