43-101 2008 Technical Report On The La Fortuna Project, Durango ...
43-101 2008 Technical Report On The La Fortuna Project, Durango ...
43-101 2008 Technical Report On The La Fortuna Project, Durango ...
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14.2.1 Methods<br />
A shift of –500,000 metres east and –2,700,000 metres south was applied for ease in modeling. This had<br />
the same effect as trimming the left digit from the easting (ie: the “5”) and the left two digits from the<br />
northing.<br />
Up-to-date topographic contours were supplied in digital format (Autocad) in the file “Bancos Actuales -<br />
29102007-.dwg” (1 metre contour interval). Because those contours did not cover the entire block model,<br />
the surrounding contours (6 metre contour interval) were taken from the digital file “topo.dwg”. Collar<br />
coordinates were used to supplement the surrounding contours.<br />
A “top of oxide” surface was created from the uppermost oxide contact point in each drill hole. Similarly,<br />
a “bottom of oxide” surface was created at the bottom most oxide contact point.<br />
A block model was created with similar dimensions as the 2002 resource model (ACA Howe, 2006). No<br />
sub-blocking was used.<br />
Dimension Block Size (m) Number of Blocks Extents (m)<br />
East 10 1200 46,925-48,125<br />
North 10 1200 50,355-51,555<br />
Elevation 6 330 1,500-1,830<br />
Oxide and overburden geology was applied to the block model using the topographic, oxide upper contact<br />
and oxide lower contact surfaces.<br />
Gold grades were estimated for oxide blocks using ordinary kriging along with the parameters that were<br />
used for the 2002 resource estimate (ACA Howe, 2006).<br />
Category<br />
Measured<br />
(Category 1)<br />
Indicated<br />
(Category 2)<br />
Inferred<br />
(Category 3)<br />
Dip<br />
Dir. Strike Dip<br />
Dip<br />
Range<br />
Strike<br />
Range<br />
Across<br />
Dip<br />
Range<br />
Max #<br />
Per<br />
Hole<br />
Min<br />
Number<br />
of<br />
Samples<br />
Max<br />
Number<br />
of<br />
Samples Sill Nugget<br />
45 315 -45 120 65 6 2 4 8 1.73 0.10<br />
45 315 -45 250 135 6 2 2 3 1.73 0.10<br />
45 315 -45 250 135 12 1 1 1 1.73 0.10<br />
14.2.2 Cut-off Grade<br />
A cut-off grade of 0.15g/tonne Au was used to determine which blocks were to be included in the mineral<br />
resource. Meaning, blocks with a grade less than 0.15g/tonne Au were not included in the mineral<br />
resource.<br />
14.2.3 Results<br />
Mineral resources in the Measured + Indicated categories amounted to 94million tonnes with an average<br />
gold grade of 0.39g/tonne (Table 14-16). Inferred Resources totaled 4.5 million tonnes with an average<br />
gold grade of 0.38g/tonne. Mineral Resources at various cut-off grades are also shown in Table 12 below.<br />
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