Overview
| Stage | Permitting |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Mine Life | 10 years (as of Jan 1, 2021) |
Regis continues to have constructive engagements with all levels of government and positive progress has been made on several fronts regarding permitting associated with the project. The Definitive Feasibility Study (DFS) is also progressing and will be finalised once the NSW Department of Planning, Industry and Environment makes a recommendation on the project. |
Source:
p. 32
Contractors
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Summary:
The McPhillamys gold deposit lies along one of a series of north-south trending splays/horsetail structures that occur at the inflection of the Godolphin-Copperhania Fault Zone where the orientation changes from NNW-SSE to SSW-NNE. The splays are defined by strong shearing and faulting and continue to the south for over 6km. The deposit is hosted by dacite- rich volcaniclastic rocks of the Silurian-aged Anson formation which vary in composition from crystal tuffs to agglomeratic, matrix-supported accretions.
Gold mineralisation is associated with strongly sheared volcaniclastics with strong quartz- carbonate-sericite-pyritepyrrhotite alteration. The gold mineralisation trends roughly north-south over a strike distance of 900m and dips steeply east at 70º to 80º to the east.
Summary:
A conventional load and haul mining method has been selected for the development of the MGP. Open pit mining activities are expected to be conducted by an experienced third-party earthmoving contractor.
All mining is proposed to take place 24 hours per day, 7 days per week using conventional excavators and haul trucks as used in open pit gold mining operations world-wide. The mineralised ore profile will be mined in benches of between 2.5 and 5.0 metres for grade and selectivity considerations. The ore boundaries will be determined by grade control drilling.
Allowance has been made in the mining schedule to blast 70% of the oxide domain (excluding clay zone defined as free dig) and 100% of the transitional and fresh domains prior to load and haul of the material to the waste dumps, low grade stockpile or ROM.
The single open pit will be mined in two stages to assist in reducing total earthmoving production requirements and in particular the first two years of operation. Additional detailed scheduling will be required to further optimise material movement and manage the estimated 20 to 25% of Potentially Acid Forming (PAF) waste material contained within the pit.
Pit slope design parameters have been developed to a level of confidence suitable for DFS level design. Based on the structural and geotechnical interpretations, a range of likely controlling slope failure mechanisms have been proposed, from bench-scale up to inter-ramp and ........
Source:
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Flow Sheet:
Summary:
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Projected Production:
All production numbers are expressed as metal in doré.
Operational Metrics:
| Metrics | |
|
Annual ore mining rate
| 7 Mt * |
|
Annual milling capacity
| 7 Mt * |
|
Stripping / waste ratio
| 4.29 * |
|
Waste tonnes, LOM
| 91,600,000 bcm * |
|
Ore tonnes mined, LOM
| 21,300,000 bcm * |
|
Total tonnes mined, LOM
| 112,900,000 bcm * |
|
Tonnes milled, LOM
| 60.1 Mt * |
* According to 2017 study.
Reserves at December 31, 2020:
Resources are reported at cut-off grade 0.4 g/t Au.
Reserves are reported at cut-off grade not less than 0.4 g/t Au, that vary according to oxidation and lithology domains.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
61 Mt
|
Gold
|
1 g/t
|
2,020 koz
|
|
Indicated
|
69 Mt
|
Gold
|
1 g/t
|
2,280 koz
|
|
Inferred
|
1 Mt
|
Gold
|
0.6 g/t
|
10 koz
|
|
Total Resource
|
70 Mt
|
Gold
|
1 g/t
|
2,290 koz
|
Commodity Production Costs:
| | Commodity | Units | Average |
|
Cash costs
|
Gold
|
AUD
|
918.57 / oz *
|
|
All-in sustaining costs (AISC)
|
Gold
|
AUD
|
990 / oz *
|
|
Assumed price
|
Gold
|
AUD
|
1,600 / oz *
|
* According to 2017 study / presentation.
Operating Costs:
| | Units | 2017 |
|
OP mining costs ($/t milled)
|
AUD
| 15.5 * |
|
Processing costs ($/t milled)
|
AUD
| ...... |
|
G&A ($/t milled)
|
AUD
| ...... |
|
Total operating costs ($/t milled)
|
AUD
| ...... |
* According to 2017 study.
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2017 Study Costs and Valuation Metrics :
| Metrics | Units | LOM Total |
|
Pre-Production capital costs
|
$M AUD
|
......
|
|
OP OpEx
|
$M AUD
|
......
|
|
Processing OpEx
|
$M AUD
|
613.6
|
|
G&A costs
|
$M AUD
|
45.3
|
|
Total OpEx
|
$M AUD
|
......
|
|
Gross revenue (LOM)
|
$M AUD
|
......
|
|
Pre-tax NPV @ 5%
|
$M AUD
|
......
|
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