43-101 2008 Technical Report On The La Fortuna Project, Durango ...

14.2.1 Methods
A shift of –500,000 metres east and –2,700,000 metres south was applied for ease in modeling. This had
the same effect as trimming the left digit from the easting (ie: the “5”) and the left two digits from the
northing.
Up-to-date topographic contours were supplied in digital format (Autocad) in the file “Bancos Actuales -
29102007-.dwg” (1 metre contour interval). Because those contours did not cover the entire block model,
the surrounding contours (6 metre contour interval) were taken from the digital file “topo.dwg”. Collar
coordinates were used to supplement the surrounding contours.
A “top of oxide” surface was created from the uppermost oxide contact point in each drill hole. Similarly,
a “bottom of oxide” surface was created at the bottom most oxide contact point.
A block model was created with similar dimensions as the 2002 resource model (ACA Howe, 2006). No
sub-blocking was used.
Dimension Block Size (m) Number of Blocks Extents (m)
East 10 1200 46,925-48,125
North 10 1200 50,355-51,555
Elevation 6 330 1,500-1,830
Oxide and overburden geology was applied to the block model using the topographic, oxide upper contact
and oxide lower contact surfaces.
Gold grades were estimated for oxide blocks using ordinary kriging along with the parameters that were
used for the 2002 resource estimate (ACA Howe, 2006).
Category
Measured
(Category 1)
Indicated
(Category 2)
Inferred
(Category 3)
Dip
Dir. Strike Dip
Dip
Range
Strike
Range
Across
Dip
Range
Max #
Per
Hole
Min
Number
of
Samples
Max
Number
of
Samples Sill Nugget
45 315 -45 120 65 6 2 4 8 1.73 0.10
45 315 -45 250 135 6 2 2 3 1.73 0.10
45 315 -45 250 135 12 1 1 1 1.73 0.10
14.2.2 Cut-off Grade
A cut-off grade of 0.15g/tonne Au was used to determine which blocks were to be included in the mineral
resource. Meaning, blocks with a grade less than 0.15g/tonne Au were not included in the mineral
resource.
14.2.3 Results
Mineral resources in the Measured + Indicated categories amounted to 94million tonnes with an average
gold grade of 0.39g/tonne (Table 14-16). Inferred Resources totaled 4.5 million tonnes with an average
gold grade of 0.38g/tonne. Mineral Resources at various cut-off grades are also shown in Table 12 below.
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