Overview
Stage | Permitting |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Mine Life | 11 years (as of Jan 1, 2023) |
Previously identified as “Fifteen Mile Stream Gold Project”, the 15 Mile Project has been modified from producing flotation and gravity concentrates to delivering gold dore bars through conventional gravity and carbon in leach cyanidation techniques. The change of project design allows for the reuse of the existing Touquoy processing plant, reducing the capital expenditure from previous management estimates and improving overall gold recoveries from direct whole ore leach as opposed to leaching of concentrates.
Following the release of this PFS, St Barbara will now focus on preparation of updated environmental and social impact assessment for this new standalone design of the 15 Mile Project. The Feasibility Study engineering is intended to be ramped up as St Barbara sees progress towards Environmental Approval with commencement of development considered entirely achievable in mid calendar 2026. |
Latest News | St Barbara set up for growth October 31, 2023 |
Source:
p. 1,18
Atlantic Mining NS Inc, wholly owned subsidiary of St Barbara Limited, has 100% ownership of the tenements over 15 Mile (EL05889, EL52901 and EL10406).
Contractors
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Summary:
The 15 Mile (previously Fifteen Mile Stream) Project consists of Egerton-Maclean, Plenty, Hudson and 149 Deposits.
Individual mining operations, including mining at Fifteen Mile Stream, have focussed on quartz-vein hosted gold deposits within the Goldenville Formation, typically associated with the limbs and hinges of anticlines. This setting is often referred to as ‘Meguma style’ gold mineralization and a number of workers have drawn parallels with a similar style of gold mineralization in the Victorian Goldfields of eastern Australia (e.g. Christie et al, 1999) .
At Fifteen Mile Stream, the highest gold grades are typically associated with beddingparallel tabular quartz veins. However, the host rock material between quartz veins also carries significant gold grades. It is the quartz vein hosted gold mineralization augmented by disseminated style mineralization that forms the basis of a geological model associated with the ongoing exploration and development of the Fifteen Mile Stream gold deposit.
Mineralization at Fifteen Mile Stream is focused in the hinge of a regional anticline and generally conforms to a saddle-reef style model where veins and related alteration occur in bedding-parallel structures resulting from folding. Fold related strain is focused within the softer meta-mudstone units thus mineralization is generally controlled by stratigraphy, with bedding-parallel quartz veins and related alteration mainly confined to meta-mudst ........

Summary:
The 15 Mile Project will be mined with a conventional drill, blast and haul setup. There are four open pits: Egerton-Maclean, Plenty, Hudson and 149.
In summary:
• The peak mining rate is 8.7 million tonnes per year over a mine life of 11 years;
• A total of 18.5 million tonnes of ore will be mined at an average grade of 1.04 g/t, with a total of 52.1 million tonnes of waste mined, resulting in a stripping ratio of 2.8 tonnes waste per tonne of ore;
• The primary production equipment includes 4.5 m3 bucket production excavators and 64 tonne payload off highway mining trucks; and
• Stockpile rehandling is minimal with two small Run of Mine stockpiles for storing mill feed, with peak inventory of 0.5 million tonnes.
Changes to the previously intended mining sequence were undertaken to allow for smooth production profile across life of mine and use of exhausted open pits for backfill of selected waste to further reduce environmental disturbance.
Source:

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Flow Sheet:
Summary:

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Projected Production:
Commodity | Units | Avg. Annual | LOM |
Gold
|
koz
| 56 | 600 |
All production numbers are expressed as metal in doré.
Operational Metrics:
Metrics | |
Daily processing capacity
| ......  |
Annual processing capacity
| ......  |
Stripping / waste ratio
| ......  |
Waste tonnes, LOM
| ......  |
Ore tonnes mined, LOM
| ......  |
Total tonnes mined, LOM
| ......  |
Tonnes milled, LOM
| ......  |
* According to 2023 study.
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Reserves at September 29, 2023:
Mineral Reserves and Mineral Resources are reported at a cut-off grade of 0.30 g/t
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
4.2 Mt
|
Gold
|
1 g/t
|
140 koz
|
Probable
|
14.27 Mt
|
Gold
|
1 g/t
|
478 koz
|
Proven & Probable
|
18.47 Mt
|
Gold
|
1 g/t
|
618 koz
|
Measured
|
4.41 Mt
|
Gold
|
1 g/t
|
147 koz
|
Indicated
|
17.73 Mt
|
Gold
|
1 g/t
|
592 koz
|
Measured & Indicated
|
22.15 Mt
|
Gold
|
1 g/t
|
739 koz
|
Inferred
|
2.37 Mt
|
Gold
|
1.3 g/t
|
98 koz
|
Proposed Heavy Mobile Equipment as of October 10, 2023:
HME Type | Size |
Excavator
|
4.5 cu. m
|
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