Source:
p. 59
The Windfall property is 100% owned by Osisko.
Contractors
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Deposit Type
- Vein / narrow vein
- Replacement
Summary:
The Windfall deposit is classified as a pre-Temiskaming intrusion-associated gold deposit due to: 1) a temporal and spatial association of gold with felsic calc-alkaline QFP intrusions; and 2) the main gold event (i.e., vein- and replacement-type mineralization) being interpreted to pre-date known regional scale deformation.
Mineralization consists of a network of quartz-carbonate-pyrite-tourmaline veins and an associated silica-sericite-pyrite alteration assemblage. The mineralization and alteration have strike lengths of >2 km that show, as of yet, no recognized vertical zoning. Gold mineralization is only locally spatially associated with calc-alkaline QFP dikes but shows no genetic association with them. The QFP intrusions were emplaced mainly as a product of tectonism and deformation and act only as competent host rocks that concentrate deformation and gold-bearing hydrothermal fluids.
Mineralization
Gold mineralization in the Windfall deposit is observed in two main settings and include: 1) vein-type mineralization; and 2) replacement type mineralization.
Vein-type mineralization consists of grey to translucent coloured quartz veins that contain subordinate amounts of ankerite, tourmaline, pyrite and commonly visible gold. The veins have sharp contact margins that are straight or folded. Texturally these veins are massive, but locally can form laminated textures characteristic of fault-fill veins (Robert and Poulsen, 2001). The vei ........
Mining Methods
- Longhole stoping
- Longitudinal stoping
- Cemented backfill
- Paste backfill
Summary:
The Windfall Project mineralization varies in dip and thickness both along strike and at depth. All geometries are suitably extracted using the Longitudinal Longhole Stoping method with backfill.
The Windfall Project has three primary zones: Lynx (Lynx zone), Main and Underdog (Main zone). All zones trend roughly east-northeast and dip vertically between 45° to 90°. The Main zone is the western portion of the planned mining area and the Lynx zone is the eastern portion. The zones are accessed by three ramp systems, with two surface portals for transportation and material haulage.
Longitudinal longhole mining is suitable for the Windfall Project, where the dip of the mineralization is 45° or greater, and the materialized zones are of sufficient width and grade that the estimated dilution does not eliminate the profitable recovery of the material. Mining will consist of an undercut level and an overcut level, each accessed from the main ramp or an access drift. Each sill will be accessed perpendicularly from the ramp or access drift, and then developed along strike of the vein to the economic extents of the mineralization.
Once sill development is completed on each level, production holes are drilled between the sills and then blasted until the stoping panel is completed. Following cavity monitoring of the stope, the void is then prepared for backfill. Once a sufficient distance along strike (one to two stope lengths) has been extracted and back ........
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Flow Sheet:
Summary:
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Reserves at November 25, 2022:
The Mineral Resource is reported at 3.5 g/t Au cut-off.
The Mineral Reserve is reported a 1.7-g/t marginal cut-off grade.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
12,183 kt
|
Gold
|
8.06 g/t
|
3,159 koz
|
|
Probable
|
12,183 kt
|
Silver
|
4.18 g/t
|
1,639 koz
|
|
Measured
|
811 kt
|
Gold
|
11.4 g/t
|
297 koz
|
|
Measured
|
811 kt
|
Silver
|
6.7 g/t
|
174 koz
|
|
Indicated
|
10,250 kt
|
Gold
|
11.4 g/t
|
3,754 koz
|
|
Indicated
|
10,250 kt
|
Silver
|
5.9 g/t
|
1,939 koz
|
|
Measured & Indicated
|
11,061 kt
|
Gold
|
11.4 g/t
|
4,050 koz
|
|
Measured & Indicated
|
11,061 kt
|
Silver
|
5.9 g/t
|
2,110 koz
|
|
Inferred
|
12,287 kt
|
Gold
|
8.4 g/t
|
3,337 koz
|
|
Inferred
|
12,287 kt
|
Silver
|
4.8 g/t
|
1,892 koz
|
Water requirements for the plant are divided into two main areas, industrial water and process water.
The total industrial water requirement for the process plant (including process water tank makeup) was estimated at approximately 194 m3/d.
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