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Australia
Woodlawn Mine

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 Location:
49 km NE from Canberra, New South Wales, Australia

  Address:
507 Collector Road
Tarago
New South Wales, Australia
2580
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit & Underground
Commodities
  • Zinc
  • Copper
  • Lead
  • Gold
  • Silver
Mining Method
  • Transverse open stoping
  • Longitudinal stoping
  • Paste backfill
  • Hydraulic mining
Production Start...
Mine Life9.3 years (as of Jan 1, 2016)
Construction of the Woodlawn project was completed in the June 2019 quarter and the first lead and zinc concentrates were produced and shipped in September and October 2019. The first concentrate sales revenue was received in October 2019.

Heron Resources suspended operations at Woodlawn in March 2020 as it worked through a strategic process to get the best value out of the operation. The majority of employees and all contractors were demobilised following the announcement.

Woodlawn underground mine and new processing plant/site infrastructure, which are currently in care and maintenance.


Owners

Source: p. 1-2
CompanyInterestOwnership
DEVELOP Global Ltd. 100 % Indirect
Heron has a direct 100% ownership of the mineral rights at the Woodlawn Mine site situated 40km south of Goulburn and 250km southwest of Sydney, in southern NSW, Australia.

February 17, 2022 - Develop proposed to acquire 100% of the shares in Heron Resources Limited (administrators appointed) (Heron), which owns the Woodlawn Project.

May 20, 2022 - Develop (ASX: DVP) completed the acquisition of the Woodlawn zinc-copper mine in NSW by purchasing all the shares in Heron Resources Limited pursuant to the terms of a deed of company arrangement (DOCA) and the Orders of the Supreme Court of New South Wales (see Develop's ASX release dated 17 February 2022 for further details).

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Tailings
  • Vein / narrow vein
  • VMS


Summary:

The Woodlawn VMS deposit lies on the eastern limb of the asymmetric northnorthwest plunging Woodlawn Syncline. The regional structures trend approximately north-northwest with the local foliation dipping moderately to steeply to the west. The Woodlawn deposit is hosted by regionally metamorphosed (green schist facies) fine to coarse grained felsic to intermediate volcanic rocks, volcanogenic sedimentary rocks and minor carbonaceous shale, known as the Woodlawn Volcanics. The axial plane dips at about 60° to the west and is paralleled by a strong slaty cleavage or in places a schistosity through the mine sequence.

Within the Woodlawn mine area, the Woodlawn Volcanics comprise a lower sequence of coarse-grained silica and sericite altered volcaniclastic quartz-phyric rhyolitic rocks with siltstone, mudstones and minor basalt overlain by strongly silica and sericite altered rhyodacitic to intermediate volcaniclastic mudstones and sandstones that host the massive sulphide lenses. Overlying the mineralised sequence is a less altered massive, coherent, quartz–feldspar phyric rhyolite unit. The Woodlawn Volcanics have been intruded by calc-alkaline and tholeiitic dolerites (McKay & Hazeldene 1987) related to the Currawang Basalt. Dolerites postdate hydrothermal alteration and mineralisation at Woodlawn and are boudinaged (along with mineralisation) indicating that they were emplaced prior to deformation.

The Currawang deposit is conformable to and hosted by sub ........


Mining Methods

  • Transverse open stoping
  • Longitudinal stoping
  • Paste backfill
  • Hydraulic mining


Summary:

Mining at the Woodlawn Project will proceed from two independent ore sources, fresh ore from underground and surface reclaimed tailings from the existing tailings dams.

The tailings will be hydraulically mined using a bottom up approach with a channel feeding back to a sump.

The underground is scheduled to produce at an annualised maximum rate of up to 864 ktpa using three different mining methods:
- Drift and half uppers;
- Underhand Longitudinal Open Stoping; and
- Underhand Transverse Open Stoping.

The underground production is supplemented by the retreatment of the tailings from the previous mining operations. Work undertaken on the processing of the underground ore and tailings has determined that a steady-state production rate was not required for the underground operation, so no nominal production rate was defined for the underground operation. The operation was scheduled with no steady-state production rate target. Access to the Woodlawn mine will be through a new boxcut and portal located to the west of the existing open pit. Ore is scheduled from a combination of new and remnant resource blocks. Ore will be truck hauled to surface then transferred overland to the processing plant located 1.2km to the east via a 2.1km long haul road.


Crushing and Grinding
Source: Subscription required

- subscription is required.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:
Production from July 1, 2019, during the 9 months preceding the suspension of operations. On 25 March 2020, Heron announced the suspension of operations at Woodlawn, only 5 months after the sale of the first concentrate produced from the new process plant.

CommodityProductUnits2020Avg. Annual (Projected)LOM (Projected)
Zinc Concentrate kt  ......  Subscription required517
Copper Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate M lbs 68627
Copper Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics2020
Ore tonnes mined  ......  Subscription required
Tonnes processed  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2019:
The Mineral Reserve and Resource estimate as at February 2022 at Woodlawn mine is unchanged from June 30, 2019.
7% ZnEq cut-off grade for Polymetallic and 1% Cu cut-off grade for Copper.

CategoryOreTypeTonnage CommodityGrade
Proven Tailings 6.2 Mt Zinc 2.2 %
Proven Tailings 6.2 Mt Copper 0.5 %
Proven Tailings 6.2 Mt Lead 1.3 %
Proven Tailings 6.2 Mt Gold 0.3 g/t
Proven Tailings 6.2 Mt Silver 31 g/t
Proven Tailings 6.2 Mt Zinc Equivalent 6 %
Probable Tailings 3.1 Mt Zinc 2.1 %
Probable In-Situ (UG) 3.1 Mt Zinc 5.2 %
Probable Tailings 3.1 Mt Copper 0.5 %
Probable In-Situ (UG) 3.1 Mt Copper 1.6 %
Probable Tailings 3.1 Mt Lead 1.3 %
Probable In-Situ (UG) 3.1 Mt Lead 1.8 %
Probable Tailings 3.1 Mt Gold 0.3 g/t
Probable In-Situ (UG) 3.1 Mt Gold 0.4 g/t
Probable Tailings 3.1 Mt Silver 32 g/t
Probable In-Situ (UG) 3.1 Mt Silver 38 g/t
Probable Tailings 3.1 Mt Zinc Equivalent 6 %
Probable In-Situ (UG) 3.1 Mt Zinc Equivalent 13.1 %
Proven & Probable Tailings 9.3 Mt Zinc 2.2 %
Proven & Probable In-Situ (UG) 3.1 Mt Zinc 5.2 %
Proven & Probable Tailings 9.3 Mt Copper 0.5 %
Proven & Probable In-Situ (UG) 3.1 Mt Copper 1.6 %
Proven & Probable Tailings 9.3 Mt Lead 1.3 %
Proven & Probable In-Situ (UG) 3.1 Mt Lead 1.8 %
Proven & Probable Tailings 9.3 Mt Gold 0.3 g/t
Proven & Probable In-Situ (UG) 3.1 Mt Gold 0.4 g/t
Proven & Probable Tailings 9.3 Mt Silver 31 g/t
Proven & Probable In-Situ (UG) 3.1 Mt Silver 38 g/t
Proven & Probable Tailings 9.3 Mt Zinc Equivalent 6 %
Proven & Probable In-Situ (UG) 3.1 Mt Zinc Equivalent 13.1 %
Measured & Indicated Tailings 9.8 Mt Zinc 2.2 %
Measured & Indicated In-Situ (UG) 4.5 Mt Zinc 6.5 %
Measured & Indicated Tailings 9.8 Mt Copper 0.5 %
Measured & Indicated In-Situ (UG) 4.5 Mt Copper 2 %
Measured & Indicated Tailings 9.8 Mt Lead 1.3 %
Measured & Indicated In-Situ (UG) 4.5 Mt Lead 2.4 %
Measured & Indicated Tailings 9.8 Mt Gold 0.3 g/t
Measured & Indicated In-Situ (UG) 4.5 Mt Gold 0.5 g/t
Measured & Indicated Tailings 9.8 Mt Silver 32 g/t
Measured & Indicated In-Situ (UG) 4.5 Mt Silver 51 g/t
Measured & Indicated Tailings 9.8 Mt Zinc Equivalent 6.2 %
Measured & Indicated In-Situ (UG) 4.5 Mt Zinc Equivalent 16.1 %
Inferred Tailings 1.1 Mt Zinc 2.3 %
Inferred In-Situ (UG) 2.9 Mt Zinc 5.2 %
Inferred Tailings 1.1 Mt Copper 0.5 %
Inferred In-Situ (UG) 2.9 Mt Copper 1.8 %
Inferred Tailings 1.1 Mt Lead 1.2 %
Inferred In-Situ (UG) 2.9 Mt Lead 2 %
Inferred Tailings 1.1 Mt Gold 0.3 g/t
Inferred In-Situ (UG) 2.9 Mt Gold 0.5 g/t
Inferred Tailings 1.1 Mt Silver 27 g/t
Inferred In-Situ (UG) 2.9 Mt Silver 40 g/t
Inferred Tailings 1.1 Mt Zinc Equivalent 5.8 %
Inferred In-Situ (UG) 2.9 Mt Zinc Equivalent 14 %
Total Resource Tailings 10.8 Mt Zinc 2.2 %
Total Resource In-Situ (UG) 7.4 Mt Zinc 6 %
Total Resource Tailings 10.8 Mt Copper 0.5 %
Total Resource In-Situ (UG) 7.4 Mt Copper 1.9 %
Total Resource Tailings 10.8 Mt Lead 1.3 %
Total Resource In-Situ (UG) 7.4 Mt Lead 2.2 %
Total Resource Tailings 10.8 Mt Gold 0.3 g/t
Total Resource In-Situ (UG) 7.4 Mt Gold 0.5 g/t
Total Resource Tailings 10.8 Mt Silver 31 g/t
Total Resource In-Situ (UG) 7.4 Mt Silver 48 g/t
Total Resource Tailings 10.8 Mt Zinc Equivalent 6.1 %
Total Resource In-Situ (UG) 7.4 Mt Zinc Equivalent 15.2 %



Proposed Heavy Mobile Equipment as of July 19, 2016:
HME TypeSizeQuantityLeased or
Contractor
Drill 89 mm ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Financial Review 2022
Press Release 2022
................................... Subscription required 2020
................................... Subscription required 2019
Feasibility Study Report 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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