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
Seven geophysical survey lines oriented north-south were completed in the Pulacayo area
and these were oriented approximately perpendicular to the east-west strike of the TVS
(Figure 9.2). At Paca a total of 5 similarly oriented survey lines were completed.
The IP survey was successful in outlining several areas of anomalously low apparent
resistivity that, based on correlation in an area of known bedrock geology, were interpreted
to represent weakly altered rocks. On the same basis, high apparent resistivity zones were
interpreted to represent zones of siliceous alteration.
Chargeability results were seen to vary between 2 and 20 mV/m. Chargeability values below
7 mV/m were interpreted to represent the background values. Highest chargeability values
are seen along lines LPY4, LPY5 and LPY6 at Pulacayo between stations 0 and -900, and
these are coincident with high apparent resistivity values. The TVS zone occurs within this
anomaly between -750 m and -900 m. Fractal interpreted these responses as representing
an area of silicification containing disseminated sulphide mineralization. Combined results of
the survey show that an east-west oriented zone of anomalous apparent resistivity and
chargeability responses measuring some 450 m in width and extending over the length of
the survey grid that contains the TVS (Figure 9.3). Moderately anomalous values in
chargeability located at the edges of the main anomalous zone were interpreted as altered
rocks that could be related to a mineralized vein system at depth.
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