Information
The calculation parameters for the reserves are:
Ore density: 2.75 t/m³.
Grade of drilling samples: 68.5 g/t.
PARAMETERS FOR ROOM-AND-PILLAR STOPE
GEOMETRY
- Stope of 6 m to 10 m (20 ft to 33 ft) wide in the vein plan
- Square pillar of 3 m (10 ft) or longitudinal of 2 m (6.6 ft) in the vein plan
- Maximum dip: 40 degrees
ORE RECOVERY: 90% (10% from pillar).
DILUTION
- Internal: Minimal mining thickness: 2 m (6.6 ft) with 10 degree dip, and 2.5 m (8.2 ft) with 35-degree dip. (The drilling intersections are brought to a minimal thickness of 2 m or 2.5 m.)
- External: 5% of the waste will be mined with the ore and therefore included with the reserves.
CUT-OFF GRADE (economic limit):
- Room-and-pillar stope developed: 7.39 g/t
- Room-and-pillar stope non-developed: 7.93 g/t
- Longhole stope developed: 5.13 g/t
- Longhole stope non-developed: 5.67 g/t
PARAMETERS FOR LONGHOLE STOPE
GEOMETRY
- Stope of a maximum length of 30 m (98 ft).
- Minimum dip: 45 degrees.
ORE RECOVERY:
- 85% for the sections of the stopes that were not planned.
- 100% for the planned stopes; the pillars are excluded from the reserve.
DILUTION
- Internal: Minimum mining thickness: 3 m (10 ft). (The drilling intersections are brought to a minimal thickness of 3 m.)
- External:
- 10% of the waste will be mined with the ore for the primary stopes (Zone B).
- 15% of the waste will be mined with the ore, and therefore included in the reserve.
CUT-OFF GRADE (economic limit):
- Developed stope: 5.38 g/t.
- Undeveloped stope: 5.83 g/t.
Attached Documents
Information
PARAMETERS AS OF JANUARY 1999:
- Price of gold used: US$350/oz with an exchange rate of 1.455; C$509/oz = C$16/g
- Operation costs: see attached document.
- Ore recovery at the mill: 97.0%.
- Cut-off grade:
- 5.76 g/t in room and pillar stopes, shaft 2.
- 5.9 g/t in room and pillar stopes, Lamaque.
- 5.8 g/t in conventional cut and fill.
- 5.46 g/t in mechanized cut and fill.
- 5.0 g/t in Vbr cut and fill.
- 3.95 g/t in Sigma long holes.
- 4.04 g/t in Lamaque long holes.
- 4.53 g/t in shrinkage stope.
- Density: 2.67 t/ m³.
- Dilution factor: Each reserve block is examined by the geology and engineering departments to determine which mining method and dilution factor is appropriate.
The factors are generally the following:
- - room and pillar: 1 vein = 1.8 m of mining height.
- - shrinkage stope: 15%.
- - cut and fill: 20%.
- - long hole 1.8 m (6 ft) of power: 33%.
- - long hole 2.4 m (8 ft) of power: 25%.
- - long hole 3.0 m (10 ft) of power: 20%.
The width of the zones (1.8 m, 2.4 m and 3.0 m) is defined in function of the structures as well as the linearity.
HIGH CUT-OFF GRADE AS OF JANUARY 1, 1999:
- Chip sample: 34.29 g/t at Sigma and 85.00 g/t at Lamaque.
- Muck sample: 25.00 g/t at Sigma and 25.00 g/t at Lamaque.
- Drill core: 34.29 g/t at Sigma and 85.00 g/t at Lamaque.
Attached Documents
Information
TONNAGE AND GRADE CALCULATIONS
The 3D model defines the orebody. This model, in turn, is divided into 3 m x 3 m x 3 m (10 ft x 10 ft x 10 ft) blocks. The grade and tonnage of these blocks are based on the following parameters:
- Diamond drill assays are cut to 56 g/ton (2.0 oz/ton).
- Grade calculations for the individual ore blocks are derived by an inverse distance cubed relationship with a search radius of 22.8 m (75 ft).
- Tonnage factor of 0.31 cubic meter/ton (11.2 cubic foot/ton).
- Gold content of the individual blocks is the product of: (derived tonnage) x (length weighted grade)
- The individual ore blocks are initially assigned a dilution factor of 20% and a dilution grade of 1.4 g/ton (0.05 oz/ton). Once a mining method has been selected for an individual mining block (stope), the dilution factor may be changed as follows:
- Cut-and-fill: 15%
- Mechanized Cut-and-fill: 20%
- Shrinkage: 20%
- Longhole: 25%
- Blind Longhole: 30%
- The minimum mining width is 1.8 m (6 ft) for conventional mining and 2.4 m to 3 m (8 ft to 10 ft) for mechanized mining.
Information
The minimum cut-off grade is established at 2.8 g Au/t (0.10 oz Au/t), while any sample with a grade higher than 28 g Au/t (1.0 oz Au/t) is troncated to 28 g Au/t (1.0 oz Au/t).
The tonnage factor used is 0.33 cubic metre per tonne (11.5 cu.ft/t). This factor was measured at the East Malartic mill.
The true minimum thickness of 1.7 m (5.5 ft) is applied. The narrowest intersections are diluted up to 1.7 m (5.5 ft).
A dilution of 15% at a grade of 0.57 g Au/t (0.02 oz Au/t) is added to the proven and probable tonnes.
Information
Probable Reserve Parameters:
- The cut-off grade: 0.160 oz/ton when diluted at 30%.
- The specific gravity: when available, a measured specific gravity is used for each ore intersection. Otherwise, an average specific gravity of 2.8 is used.
- External Polygon maximum size: 30 m (98 ft) radius or halfway to the nearest waste hole.
- Internal Polygon maximum size: 80 m (262 ft) radius or halfway to the nearest ore hole.
- Minimum Mining Width: 2.44 m (8 feet).
- Cross-sectional analysis: 2.0 oz/t.
- Cut-off grade analysis: 0.080 oz/t.
- Mining dilution:
- Ore width less than 4 m: 30%.
- Ore width from 4 to 6 m: 20%.
- Ore width over 6 m: 10%.
- Dilution degree: 0.016 oz/t.
- Adjustment Factor for Dip:
- For all Zones Level 1 to 4: 1.3054 (50 degrees).
- Level 4 to 6: 1.2208 (55 degrees).
- Level 6 to 10: 1.1547 (60 degrees).
- Data Base:
- Surface drill holes, where required.
- Underground drill holes.
- Composited chip sample data.
Proven reserve parameters:
Proven reserves were calculated using a strict 30 m (98 ft) radius polygon, within the zones of continuous ore. All other parameters were the same as those used to calculate probable reserves.