Overview
| Status | Care and Maintenance |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Open stoping
- Room-and-pillar
|
| Processing |
- Gravity separation
- Agitated tank leaching
- Carbon in leach (CIL)
- Elution
- Carbon adsorption-desorption-recovery (ADR)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
|
Underground mining was completed at the King of the Hills mine in February 2017 with a total of 610 metres of development for 11k oz which was hauled to Thunderbox and treated during the first 3 quarters of FY2017. The mine was placed into care and maintenance in March 2017 while a strategic review was completed. Further to this, the sale of the operation to ASX listed Red 5 Ltd (ASX:RED) was announced on 3 August 2017. |
Source:
p. 1, 2
King of the Hills (KOTH) Gold Project was acquired by Red 5 from the leading mid-tier West Australian gold producer Saracen Mineral Holdings (ASX: SAR) in early October 2017.
Summary:
Gold mineralisation is associated with sheeted quartz vein sets within a hosting granodiorite stock and pervasively carbonate altered ultramafic rocks. Mineralisation is thought to have occurred within a brittle/ductile shear zone with the main thrust shear zone forming the primary conduit for the mineralising fluids. Pre-existing quartz veining and brittle fracturing of the granite created a network of second order conduits for mineralising fluids.
Gold appears as free particles or associated with traces of base metals sulphides (galena, chalcopyrite, pyrite) intergrown within quartz along late stage fractures.
Mining Methods
- Open stoping
- Room-and-pillar
Summary:
The mining method is underground, open stoping and room and pillar. Minimum height is approximately 5m with the resource reported on similar size panels to reflect this relationship.
Processing Technologies
- Gravity separation
- Agitated tank leaching
- Carbon in leach (CIL)
- Elution
- Carbon adsorption-desorption-recovery (ADR)
- Solvent Extraction & Electrowinning
- Cyanide (reagent)
Summary:
The Company targeting the delivery King of the Hills ore to the Darlot mill.
Recoveries & Grades:
| Commodity | Parameter | 2015 | 2014 |
|
Gold
|
Recovery Rate, %
| 95 | 95 |
|
Gold
|
Head Grade, g/t
| ......  | ...... |
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Production:
| Commodity | Units | 2015 | 2014 |
|
Gold
|
oz
| 49,677 | 70,711 |
Operational Metrics:
| Metrics | 2015 | 2014 |
|
Ore tonnes mined
| 457 kt | 472 kt |
|
Tonnes milled
| 392 kt | 514 kt |
Reserves at June 30, 2017:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
1,155,000 t
|
Gold
|
2.5 g/t
|
91,000 oz
|
|
Indicated
|
1,109,000 t
|
Gold
|
5.1 g/t
|
183,000 oz
|
|
Inferred
|
1,601,000 t
|
Gold
|
4.3 g/t
|
219,000 oz
|
|
Total Resource
|
2,710,000 t
|
Gold
|
4.6 g/t
|
402,000 oz
|
Commodity Production Costs:
| | Commodity | Units | 2015 | 2014 |
|
Cash costs
|
Gold
|
AUD
|
1,112 / oz†
|
973 / oz†
|
|
All-in sustaining costs (AISC)
|
Gold
|
AUD
|
1,103 / oz†
|
1,263 / oz†
|
† Net of By-Product.
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