Hillgrove Resources extends copper-gold zones through drilling at Kanmantoo Project, South Australia

ASX-listed explorer Hillgrove Resources (ASX:HGO) has extended the copper-gold zones at the South Hub within its Kanmantoo Copper-Gold Mine in South Australia through fresh 4 drillholes.

The company reports the mineralisation at the Emily Star area lies about 600m west of the Nugent Copper-Gold zone and has been previously mined by a shallow open pit by Hillgrove in 2013-2015.

Drill results from KTDD239-242 confirm the down-dip continuity of multiple copper-gold zones previously mined at the Emily Star open pit down to 1,065m RL and justify further drilling to determine the down-dip and strike extent of these copper breccia zones.

Hillgrove says the deepest Emily Star drillholes are now the recently drilled KTDD239 and KTDD240, with zones of copper-gold mineralisation over 71m and 68m downhole widths, respectively. The mineralised zones in these drillholes are at about 1,000m RL, compared to the deepest mineralisation at Kavanagh, which continues to 400m RL.

The company says the underground decline is now at 89- RL, only 570m from KTDD239 and KTDD240 and 170m below the base of the Emily Star open pit. These drillholes indicate that the Emily Star Cu-Au mineralised zone has at least a 100m strike length that is open to the north and down-plunge.

Results recorded at Kanmantoo include KTDD239 with 71.7m @ 0.89% Cu, including 9.7m @ 1.29% Cu and 0.14g/t Au from 135.6m, 4m @ 2.9% Cu and 0.61g/t Au from 159.3m, and 20.2m @ 1.7% Cu and 0.69g/t Au from 178.8m.

Other results include KTDD239 with 8.4m @ 0.96% Cu and 0.06g/t Au from 277.2m; and KTDD240 with 68.75m @ 0.9% Cu, including 4.8m @ 1.39% Cu and 0.09g/t Au from 169.5m and 35.1m @ 1.29% Cu and 0.08g/t Au from 192.2m.

Commenting on the drilling results, Hillgrove Resources Chief Executive Officer (CEO) and Managing Director Lachlan Wallace says: “The success of the 2023 drilling at Emily Star confirms the copper mineralisation continues below the base of the open pit and remains open down-plunge and to the north along strike. Emily Star is a subset of the broader South Hub complex, which continues to be reviewed as a potential additional work area.

With the stage one underground fully funded and on track for first copper production in early 2024, the drilling highlights growth potential beyond the initial mine plan”

With the stage one underground fully funded and on track for first copper production in early 2024, the drilling highlights growth potential beyond the initial mine plan. 

We continue to have an amazing exploration strike rate, with 158 mineralised intersections from 136 drillholes since drilling for the underground resources commenced in 2019, with each drilling program resulting in a material increase to the Mineral Resource Estimate (MRE).

This recent drilling provides confidence that future drilling will continue to expand the mineralisation footprint around the stage one underground development and provide opportunities to grow both the mine life and annual copper production profile.”

Hillgrove Resources is an ASX-listed explorer focused on developing its Kanmantoo Copper-Gold Mine, which lies about 55km from Adelaide in South Australia.

The company says Kanmantoo Underground is fully funded and on track to start producing copper in early 2024. Additionally, the project hosts a 3.6-million-tonne-per-annum processing plant.

On 19 June 2023, Hillgrove made a formal positive Final Investment Decision (FID) to proceed with stage one development at Kanmantoo Underground, which will be funded through a placement and share purchase plan (SPP) that raised $38 million.

Write to Harry Mulholland at Mining.com.au

Images: Hillgrove Resources Ltd
Written By Harry Mulholland
Hailing from the Central Coast region of NSW, Harry is a passionate journalist with a background in print, radio and ESG news. When not bashing away on his keyboard, he can be found brewing a coffee or playing with his dog.