Woodlawn is a high-grade, volcanogenic massive-sulphide (VMS) deposit situated in New South Wales, Australia, located approximately 50km northeast of Canberra, and 250km southwest of Sydney.
The Woodlawn Project benefits from a mining lease (SML 20) that has recently been renewed for a further 15 years, and major project approvals (statutory approval) that allows for mining operations at the Woodlawn site until 31 December 2034. The mineral rights and production are 100%-owned by Heron Resources.
An attractive Feasibility Study was completed in mid-2016. The Feasibility Study for the “Starter Case” of the Woodlawn Project envisages an initial 9.3 year Reserves-based mine life with significant exploration upside in the underground mineralised system and regional prospects, and contemplates campaign treatment processing of 1.0-1.5Mtpa from two separate production sources – underground and tailings. The Project has an annual steady state production target of approximately 40kt (88Mlbs) zinc in concentrate, 10kt (20Mlbs) copper in concentrate and 12kt (25Mlbs) lead in concentrate, along with associated gold and silver.
A $240M funding package was subsequently approved by shareholders in August 2017 to fully fund the construction of the project and comprises debt, equity and a silver stream. Construction and development work commenced on site in September 2017, led by Engineering, Procurement and Construction (EPC) contractor Sedgman under a Guaranteed-Maximum-Price (GMP) style contract.
First production is expected in Q1 CY2019.
Exploration within the project area is active and continuing, targeting additions to the mine’s resource base. A large number of available targets provides for both extensions to known massive sulphide positions and potential discovery of new lenses.
Heron Resources also holds a portfolio of tenements adjacent to the Woodlawn site covering the prospective felsic volcanics that host the Woodlawn VMS deposit. The Woodlawn site (SML 20) is surrounded by a larger exploration license (EL 7257) which is held 100% by Heron. This exploration license of 179km2, includes the previous Currawang Mine located 9km to the north of Woodlawn. The Currawang Mine provided satellite feed to the previous Woodlawn operations.
The Woodlawn deposit was discovered in 1969 and operated from 1978 to 1998 under various owners.
It was mined as both an open pit and underground operation and ran a tailings retreatment operation for a number of years. The mine was closed in March 1998 due to prevailing low metal prices and external corporate issues with the then-owner, Denehurst Limited.
During the operations the mine processed:
- 8.0Mt @ 8.3% Zn, 1.6% Cu, 3.1% Pb and 62g/t silver (Ag) from the Woodlawn open pit between 1978-1987;
- 530,000t @ 13.0% Zn, 1.6% Cu 2.2% Pb and 33g/t Ag from the satellite Currawang mine between 1991-1995, and
- 5.8Mt @ 10.1% Zn, 1.6% Cu, 4.1% Pb, 0.5g/t gold (Au) and 90 g/t Ag from the Woodlawn Underground between 1987-1998.
Post mine closure, the mineral rights contained within the Woodlawn Mining Licence (SML20) were purchased by an entity, which became TriAusMin Ltd. Since that time, work focused on evaluating the potential to re-process the medium grade tailings from previous mining operations and to re-develop the underground mine.
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