Pulacayo Project Feasibility Study - Apogee Silver

Pulacayo 1 000 t/d Phase I Feasibility Study - NI 43-101 Technical Report
090644-3-0000-20-IFI-100
Figure 14.8: Isometric View of the Current Workings Solid Model (View to NW)
Compatibility issues arose between the workings model and common commercial mining
modeling software such as the Gemcom-SurpacRsuite, since a significant portion of the
tunnels and stopes existed in an incompatible solid model format and other tunnels existed
only as 2D CAD files. To deal with this issue, the perimeter of the workings existing in solid
model format was converted to level plan string files at 1 m increments and these were
subsequently populated with a point every meter along each string file. A vertical ellipsoid
oriented along the strike of the deposit with a 2.5 m major axis and 1.25 m semi-major and
minor axes was then passed through the block model to identify intersecting blocks that
define the workings. Additionally, the 2D CAD format tunnels were populated with a point
every meter along each file and a vertically dipping ellipsoid oriented along the strike of the
deposit, with a 2.5 m major axis, 1.67 semi-major axis and 1.50 m minor axis, was then
passed through the block model to identify intersecting blocks that define the workings.
Interpolated blocks intersecting level plan string files of the upgraded workings model were
considered to have been previously mined and were assigned null values for all attributes
after block model grade interpolation procedures were completed (Figure 14.9).
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