Kookaburra Gully Graphite Project
Lincoln’s flagship project, Kookaburra Gully Graphite Project, is 35km north of Port Lincoln on South Australia’s Eyre Peninsula.
The Kookaburra Gully Graphite Project has been assessed to contain Measured, Indicated and Inferred Resources of 4.11Mt at 12.81% TGC using a 5% TGC cut-off (refer ASX release: Total, Measured, Indicated and Inferred Mineral Resources for Kookaburra Gully graphite deposit as announced on 27 June 2023).
The Kookaburra Gully Graphite Project area includes:
- The Kookaburra Gully Graphite Deposit
- The historic Koppio Graphite Mine and associated deposit
- The Kookaburra Gully Extended (KGE) Prospects
The successful 2023 drilling results at Koppio and KGE will be incorporated into Lincoln’s geological model of graphite mineralisation over the project area with the aim of upgrading the graphite resource inventory in the Kookaburra Gully Graphite Project and an ongoing review of the 2017 Mining Feasibility Study, currently being undertaken by SRK Consulting.
Kookaburra Gully Graphite Deposit
The Kookaburra Gully Graphite Deposit is the key asset in Lincoln’s Kookaburra Gully Graphite Project.
Following electromagnetic (EM) surveys flown over the Koppio and Cockabidnie-Campoona areas in July 2012, resource definition drilling was completed over the Kookaburra Gully graphite deposit in January 2013 with aircore drilling on an 80m x 40m grid spacing. Establishing the Mineral Resource at Kookaburra Gully has given confidence in mapping the Kookaburra Gully Extended Prospects that are along trend and confirm with the EM anomaly as shown in Figure 1.
Figure 1: Kookaburra Gully Graphite Project area overlying the regional EM survey data
Table 1: Kookaburra Gully Mineral Resource at 5% cut-off grade
| Classification | Tonnage (Mt) | TGC (%) | Contained Graphite (kt) |
|---|---|---|---|
| KG RESOURCES | |||
| Measured | 0.39 | 14.9 | 58 |
| Indicated | 1.08 | 14.9 | 160 |
| Inferred | 0.56 | 16 | 90 |
| Sub-Total | 2.03 | 15.2 | 308 |
| KOPPIO RESOURCE | |||
| Indicated | 1.64 | 10.71 | 175 |
| Inferred | 0.44 | 9.59 | 42 |
| Total | 4.11 | 10.47 | 525 |
Table 2: Koppio Mineral Resource estimates at 2% cut-off grade
| Mineral Resource Classification | Cutoff Grade TGC (%) 2% | Tonnage (Mt) | Average Grade TGC (%) | Contained Graphite (tonnes) | Density (g/cc) |
|---|---|---|---|---|---|
| Inferred | 0.79 | 6.72 | 53,116 | 2.70 | |
| Indicated | 2.84 | 7.53 | 214,606 | 2.74 |
The maiden Mineral Resources estimated in accordance with JORC Code (2012) at Kookaburra Gully reinforces Lincoln’s confidence in being able to quickly progress the Company’s graphite resources on southern Eyre Peninsula into a high-quality, long life graphite mining and processing operation.
Kookaburra Gully Metallurgy
Metallurgic bench-scale testing of representative bulk drill and trench samples from the Kookaburra Gully Graphite deposit were undertaken in 2017. Kookaburra Gully is a flake graphite with predominantly fine flakes as shown in Table 3. This table also shows the primary use of the various flake sizes with these fine flakes being in demand for use as anodes in Lithium-ion batteries.
Table 3: Graphite Deposits
