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
11 SAMPLE PREPARATION, ANALYSIS AND SECURITY
11.1 Sample Preparation from 2006 to 2012 Apogee Programs
The following description of sample preparation and core handling protocols applies to all
drilling programs at Pulacayo in which Apogee has participated. Program details were
discussed with Apogee staff during the April 2012 site visit by Mercator and were found to be
unchanged from the time of Mercator’s earlier July 2011 site visit. Pressacco et al. (2010)
previously outlined the same general conditions as being applicable for work programs
carried out by Apogee prior to the effective date of that report.
Apogee staff are responsible for transport of core boxes by pick-up truck from drill sites to the
company’s locked and secure core storage and logging facility located in the town of
Pulacayo (Figure 11.1). The core is initially examined by core technicians and all
measurements are confirmed. Core is aligned and repositioned in the core box where
possible and individual depth marks are recorded at 1 m intervals on the core box walls. Core
technicians photograph all core, measure core recovery between core meterage blocks,
complete magnetic susceptibility readings and specific gravity measurements and record
information on hard copy data record sheets. This information is initially entered into Excel
digital spreadsheets and then incorporated into the project digital database.
Drill geologists initially complete a written quick log of drill hole lithologies along with a
graphical strip log that illustrates lithologies. They subsequently complete a detailed written
description of lithologies alteration styles and intensities, structural features, mineralization
features such as occurrences and orientations of quartz veins, and the style, amount and
distribution of sulphide minerals. Drillholes are drawn on paper cross sections when logging
is completed and lithologies are graphically correlated from drill hole to drill hole.
Mineralized intervals are marked for sampling by the logging geologist using colored grease
pencils and intervals plus associated sample numbers are recorded on a hardcopy sample
record sheet. All paper copy information for each hole, including quick logs, detailed logs,
graphical logs, sample record sheets and assay certificates are secured together in a drill
hole file folder to provide a complete archival record for each drill hole. Subsequent to logging
and processing, down hole litho coded intervals, sample intervals and drill hole collar and
survey information are entered into digital spreadsheets and then incorporated into the
project digital database.
Sample intervals are marked by the logging geologist and core technicians then cut sample
intervals in half using a diamond saw. Friable core is cut in half with a knife. Each half core
sample is assigned a unique sample tag and number and placed in a correspondingly
numbered 6 mm plastic sample bag. A duplicate tag showing the same number is secured to
the core box at the indicated sample interval. As noted earlier, all sample intervals and
corresponding numbers are recorded on a hardcopy sample date sheet and are
subsequently entered into a digital spreadsheet for later incorporation in the project
database.
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