Overview
Stage | Feasibility |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Mine Life | 13 years (as of Jan 1, 2012) |
The property consists of two separate deposits: the free-milling Heva deposit and the refractory ore Hosco deposit. Minimal work has been done on these deposits since 2014. Pending further information, the analysis provided assumes a tentative start date of 2025. |
Source:
p. 40,68
Contractors
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Summary:
The Joanna Property is situated on the famous Cadillac structural break. The structure generally strikes east-west and dips northward. It is characterized by a layer of schistose, chloritic rocks cross cutting a uniform package of metamorphosed, fine-grain sediments. Gold mineralization is composed of disseminated sulphides (pyrite, arsenopyrite and pyrrhotite) in deformed and biotite-rich zones along the Cadillac Fault. Small quartz veins ranging from a few centimetres to a metre wide are encountered in these zones. The Au disseminated mineralization is found in strongly altered and deformed corridors with an azimuth of N260° dipping 55° to the north-west. These mineralized corridors average a horizontal width of 20 metres and extend along the strike over 3,000 metres, reaching a depth of 400 m.
Gold mineralization of the Hosco-Heva area is distributed in multiple lenses on both sides of the Cadillac Fault, making each one a few metres to a few tens-of-metres thick. To date, mineralization has only been identified in the Fault zone. The more continuous and gold-rich zones seem to be associated with a silica-biotite, albite and tourmaline alteration. Mineral assemblage also includes variable concentrations of white mica, chlorite carbonate, garnet and possibly other alumino-silicates. Amphibole and tourmaline rich replacement zones have been locally identified. In the Heva zone, gold mineralization contoured this type of alteration zone. Mineralized lenses are incl ........
Summary:
Mining of the Joanna Hosco deposit will follow the standard practice of an open-pit operation with conventional drill and blast, load and haul cycle using a drill/truck/shovel mining fleet. The overburden and waste rock material will be hauled to the designated overburden and waste disposal areas. The run-of- mine ore will be drilled, blasted and loaded by hydraulic shovels and delivered by trucks to the primary crusher or stockpile near the crusher. Mining operations will support the nominal milling throughput rate of 8,500 tpd.
The slope configuration in overburden is based on LEQ’s recommendations. The pit slopes and benching arrangement in fresh rock are based on Golder’s recommendations (Golder, 2009). For the rock slopes, Golder recommends the following:
- Bench face angle (BFA) of 65° and inter-ramp angle (IRA) of 49° for Northeast to Northwest walls (including the South wall) and BFA of 70° and IRA of 53° for the North wall.
- At the current study level, it would not be appropriate to apply the recommended slope angles over extended wall heights due to the uncertainty regarding fabric continuity inherent in slope designs, based upon drillhole information. It is therefore recommended that flexibility be added to the designs by the sub-division of the final and phase walls into a series of bench stacks, no greater than 120 m high, separated by either haul road traverses or the inclusion of “geotechnical” berms at 100 m – 120 m vertical i ........
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Flow Sheet:
Summary:
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Source:
Projected Production:
Commodity | Units | Avg. Annual | LOM |
Gold
|
koz
| 109 | 1,454 |
All production numbers are expressed as metal in doré.
* According to 2012 study.
Reserves at December 31, 2023:
Measured, indicated and inferred resources at Heva and Hosco are based on $1,500/oz gold. Resources are without dilution or material loss at a gold cut-off grade of 0.01 oz/ton (0.33 g/tonne) for open pit and 0.088 oz/ton (3.0 g/tonne) for underground.
Category | Tonnage | Commodity | Grade | Contained Metal |
Indicated
|
30,553 k tons
|
Gold
|
0.04 oz/ton
|
1,278 koz
|
Inferred
|
20,513 k tons
|
Gold
|
0.04 oz/ton
|
879 koz
|
Corporate Filings & Presentations:
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