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Australia
Hera Mine

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 Location:
5 km SE from Nymagee, New South Wales, Australia

  Address:
"The Peak" Burthong Rd
Nymagee
New South Wales, Australia
2831
Phone  ...  Subscription required
Fax+61-2-6361-4711
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
  • Lead
  • Zinc
  • Copper
Mining Method
  • Longhole open stoping
  • Bench stoping
  • Dry waste backfill
Processing
  • Inline Pressure Jig
  • Centrifugal concentrator
  • Gravity separation
  • Flotation
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Merrill–Crowe
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2023
The established Hera Mine is approaching the end if its economic life with the Ore Reserve expected to be depleted in FY23. The Company is therefore evaluating development options for the nearby Federation deposit that is located approximately 10 kilometres south of the existing Hera Mine.


Owners

Source: p. 55,64
CompanyInterestOwnership
Aurelia Metals Ltd. 100 % Indirect
Hera Resources Pty Ltd (operator) 100 % Direct
Hera Mine (Hera) is an underground metalliferous mine owned by Hera Resources Pty Ltd (Hera Resources), a wholly owned subsidiary of Aurelia Metals Limited (Aurelia).

Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein


Summary:

All known mineralisation in the area is epigenetic “Cobar” style. Deposits are structurally controlled quartz + sulphide matrix breccias grading to massive sulphide.

The deposits are located in high strain zones. Metal ratios are variable but there is a general tendency for separate Pb+Zn+Ag±Au±Cu and Cu+Ag±Au ore bodies. These are often in close association with the Pb+Zn lenses lying to the west of the Cu lenses. At Hera Zn is usually more abundant than Pb.

Formation temperatures are moderate to high. At Hera the presence of Fe-rich sphalerite, nonmagnetic pyrrhotite and cubanite indicates formation temperatures between 350°C and 400°C. Recognised at Hera are quartz + K-feldspar veins, scheelite, and minor skarn mineralogy which suggest a possible magmatic input. Deposit timing is enigmatic. The main mineralisation occurs as brittle sulphide matrix breccias with silicification grading to ductile massive sulphides that crosscut both bedding and cleavage. Recent age dating on micas and galena gives an age of ~385Ma for the Hera deposit.

The mineralisation at Hera, indicated by elevated gold, silver, lead, zinc and sulphur grades, appears to be structurally controlled and is associated with shearing, brecciation and quartz veining.

The twelve solid wireframes representing mineralised domains were treated as hard boundaries during estimation of all elements except arsenic. This means that blocks inside a particular domain were estimated using only data from inside that domain. Blocks and data that lie outside of all of the mineralised domain wireframes were treated as a single additional domain. Variogram models were produced for each of the domains with sufficient data and search ellipse orientations were defined for each domain individually.

A fault, observable in underground developments, cross cuts the deposit at the southern end of Main North and is interpreted to off-set Main South by about 25 m to the west.

The reported resources at Hera span a length of around 800 m and consist of seven en echelon volumes that dip steeply to the west-southwest. The plan width of the resource varies from 2 m to 70 m (including internal low grade zones) with individual stopes reaching up to 25 m wide. The upper limit of the reported estimates occurs at a depth of around 230 m from surface and the lower limit of the resource extends to a depth of 630 m below the surface.


Mining Methods

  • Longhole open stoping
  • Bench stoping
  • Dry waste backfill


Summary:

Hera is an underground mine utilising bench stoping with the stopes backfilled with waste rock fill.

The Hera orebody is accessed from a decline located in the hanging wall. The decline has a gradient of 1:7 and production levels are nominally 25m apart.

Mining for the 2019-2020 Financial Year Period was undertaken using conventional bench stoping mining techniques. Stope voids are backfilled with waste rock material from concurrent underground development and, if required, additional waste rock material is transported from the WRE Area on the surface.

Sill pillars are every 100m vertically with an open stoping method adopting a yielding pillar above and between the previously filled panels. Level access is via the hangingwall (east) decline and the decline has a standoff of 50m from the ore body. The decline face is currently 620m vertically below surface and the sublevels are spaced vertically at 25m. Stopes are typically 30m long, 25m high and 8m wide. Stopes are demonstrating stable characteristics up to a hydraulic radius of 7.5m or approximately 30m along strike.

Since PYBAR commenced onsite in January 2013, PYBAR has been using a standard development mining fleet in an application requiring in-cycle fibrecrete and dual rock-bolt ground support to advance the 5m high, 5.5m wide, 1:7 decline.

Full scale development commenced in March 2013 and over the six month period to December 2013, the advance of the decline face averaged 6.3m per day (almost one vertical metre per day).

Using a standard fleet to achieve the rapid development rates that PYBAR has at Hera facilitates a number of advantages such as in-house equipment maintenance, capital cost reduction, flexibility and post-project disposal value.


Crushing and Grinding


Processing

  • Inline Pressure Jig
  • Centrifugal concentrator
  • Gravity separation
  • Flotation
  • Concentrate leach
  • Inline Leach Reactor (ILR)
  • Merrill–Crowe
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Hera Process Plant (480 ktpa) processes ore from the Hera Mine to produce gold-silver doré bars and a ‘bulk’ (lead+zinc) concentrate for sale.

The ore is crushed by a three-stage crushing circuit before processing by gravity, flotation and leach circuits.

The process flow sheet in summary, consists of:
- A gravity gold circuit consisting on an Inline Pressure Jig (IPJ), 2 x inline spinners and a Falcon centrifugal concentrator. These devices produce a gravity concentrate that is leached with Inline Leach Reactor (ILR) producing a gold solution to the electrowinning cells to deliver gravity gold doré for sale.
- A VTM-400 vertimill to produce a sub 250 micron feed to the flotation circuit.
- A rougher and cleaner flotation circuit to produce a lead-zinc concentrate grading +50% lead + zinc.
- A gold leach circuit which leaches the cleaner concentrate to produce a gold-silver bearing leach liquor and a final concentrate for sale.
- The ........

Recoveries & Grades:

CommodityParameter20212020201920182017
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required89.488.3
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required5.14.37
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required88.287.8
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required13.412.6
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required89.591.9
Lead Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required2.62.3
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required89.889.7
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required3.63.1
Lead / Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required56

Production:

CommodityProductUnits202220212020201920182017
Gold Metal in conc./ doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required6046
Lead Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in conc./ doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead / Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required464,339 t406,234 t373,795 t
Tonnes processed  ......  Subscription required  ......  Subscription required468,358 t407,131 t368,086 t
Annual processing capacity  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required298,616 t121,150 t
Subscription required - Subscription is required.

Reserves at June 30, 2021:
The Mineral Resource Estimate utilises A$100/t NSR cut-off mineable shapes that include internal dilution.
The Hera Ore Reserve Estimate utilises a A$80/t NSR cut-off for development and A$100/t NSR cut-off for stoping.

CategoryTonnage CommodityGrade
Proven 750 kt Gold 1.4 g/t
Proven 750 kt Lead 4.3 %
Proven 750 kt Zinc 3.4 %
Proven 750 kt Copper 2.7 %
Probable 190 kt Gold 1.2 g/t
Probable 190 kt Lead 3.6 %
Probable 190 kt Zinc 2.4 %
Probable 190 kt Copper 2.4 %
Proven & Probable 940 kt Gold 1.4 g/t
Proven & Probable 940 kt Lead 4.1 %
Proven & Probable 940 kt Zinc 3.2 %
Proven & Probable 940 kt Copper 2.6 %
Measured 880 kt Gold 1.7 g/t
Measured 880 kt Silver 35 g/t
Measured 880 kt Lead 2.8 %
Measured 880 kt Zinc 4.3 %
Measured 880 kt Copper 0.1 %
Indicated 500 kt Gold 2.1 g/t
Indicated 500 kt Silver 13 g/t
Indicated 500 kt Lead 1.8 %
Indicated 500 kt Zinc 2.6 %
Indicated 500 kt Copper 0.1 %
Inferred 280 kt Gold 1.3 g/t
Inferred 280 kt Silver 17 g/t
Inferred 280 kt Lead 1.8 %
Inferred 280 kt Zinc 2.3 %
Inferred 280 kt Copper 0.1 %
Total Resource 1,700 kt Gold 1.8 g/t
Total Resource 1,700 kt Silver 25 g/t
Total Resource 1,700 kt Lead 2.3 %
Total Resource 1,700 kt Zinc 3.5 %
Total Resource 1,700 kt Copper 0.1 %

Commodity Production Costs:

CommodityUnits20212020201920182017
All-in sustaining costs (AISC) Gold AUD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 430 / oz† 876 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units20212020201920182017
Growth Capital M AUD  ......  Subscription required0.4  
Sustaining costs M AUD  ......  Subscription required16.5   11.6  
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required155.8   109.3  
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required86.4   48.5  
Subscription required - Subscription is required


Heavy Mobile Equipment as of November 26, 2020:
HME TypeModelQuantityLeased or
Contractor
Drill (long hole) ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Jumbo ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required Leased
Shotcreter ....................... Subscription required ....................... Subscription required Leased
Truck (service) ....................... Subscription required ....................... Subscription required Leased
Truck (service) ....................... Subscription required ....................... Subscription required Leased
Truck (underground) ....................... Subscription required ....................... Subscription required Leased
Truck (water) ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Review 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Annual Review 2017
Annual Report 2016
Annual Review 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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