Thalanga Far West (Far West) is the down dip extension of the Thalanga West deposit and is classified as a volcanogenic-massive-sulphide (VHMS) style of deposit where copper, zinc, lead and silver mineralisation is found associated with a suite of sulphide minerals including sphalerite, galena, chalcopyrite, pyrite and other minor sulphide assemblages. Mineralised zones are typically represented by fault controlled lenses located within the host Quartz Eye volcaniclastic unit.

Diamond drilling has been completed over multiple drill campaigns since the early 1990’s within the Thalanga Far West project area. RGC Thalanga Pty Ltd drilled (surface and underground) into the Thalanga Far West area and also drove an exploration decline out to Thalanga Far West. Limited mining activities took place in Far West prior to the Thalanga operation being closed in 1998.

Shortly after the acquisition of the Thalanga Zinc Project was completed in September 2014, Red River engaged Mining One Consultants to commence a JORC Mineral Resource estimate for the Far West deposit. Red River announced a maiden JORC Mineral Resource of 1.2Mt @ 14.3% zinc equivalent for the Far West deposit in January 2015.

Red River then commenced a drilling program at Far West targeting extensions to the known mineralisation, and based on the data generated by this program, the Far West Mineral Resource was increased to 1.6Mt @ 14.9% zinc equivalent in May 2016.

A resource infill drilling program was commenced with the objective of increasing the level of geological knowledge and confidence at Far West to underpin the calculation of a maiden Ore Reserve at Far West.


Thalanga Far West Mineral Resource and Ore Reserve

Red River announced a Far West maiden Ore Reserve and Mineral Resource update in November 2017, with an Ore Reserve of 1.5Mt @ 12.0% zinc equivalent and a Mineral Resource of 1.7Mt @ 15.5% zinc equivalent.

Reserve Class

Tonnage (kt)

Cu (%)

Pb (%)

Zn (%)

Au (g/t)

Ag (g/t)

Zn Eq. (%)

Proved

48

1.3

1.0

4.4

0.0

27

10.1

Probable

1,486

1.3

1.6

5.0

0.2

46

12.1

Total

1,534

1.3

1.6

5.0

0.2

45

12.0


Resource Class

Tonnage (kt)

Cu (%)

Pb (%)

Zn (%)

Au (g/t)

Ag (g/t)

Zn Eq. (%)

Measured

52

1.4

1.3

5.3

0.0

32

12.0

Indicated

1,491

1.7

2.2

6.6

0.2

61

15.7

Measured + Indicated

1,543

1.7

2.1

6.6

0.2

60

15.6

Inferred

150

1.4

2.3

6.5

0.1

53

14.6

Total

1,693

1.6

2.1

6.5

0.2

59

15.5

For further details of the Thalanga Far West Ore Reserve and Mineral Resource and the supporting disclosures and appendices, please refer to the Red River ASX release “Far West Ore Reserve and Mineral Resource Update Extends Thalanga Mine Life” dated 21 November 2017


Thalanga Far West Development

Far West mine design and scheduling work is completed, and development work is expected to start in early CY2018, with first ore production targeted in 2H CY2018.

The Far West ore body will be accessed by a decline, and the Far West decline portal is planned to be located approximately 500m from the Thalanga Plant ROM pad.

Thalanga Far West Proposed Portal Location

The selected mining method is bench stoping based on 20m sublevels and stope strike lengths of 20m. The average stope width is approximately 5m with a minimum stope mining width of 2m. Stope backfill will be a combination of cemented rock fill (CRF) and unconsolidated waste rock fill, which enables a high recovery of ore, removing the need to leave pillars within the orebody, and also utilising the waste rock

Hanging wall and footwall dilution of 0.5m wide each (1m in total) was included and an additional 10% tonnage at 0% grade was applied to all stopes. A recovery factor of 95% was applied to all diluted stope tonnages. No unplanned dilution and a recovery factor of 100% were applied to development inventory.

The proposed Far West mine will use infrastructure and facilities used for West 45 given that they are only about 1km apart.

Far West is planned to be mined at rate of approximately 300-350ktpa for a minimum mine life of at least five years

Far West Mine Design