The multi-parameter information recorded consists of:
natural gamma (in counts per second or cps): measures the level of gamma radiation emitted by radioisotopes present in the subsurface materials. It is useful to map lithology and provides relative porosity of rock and soil, based on clay content;
density (cps): Gamma density can be used to calculate the bulk density of rocks, determine porosity, mineral identification and lithological mapping;
neutron: neutron logs provide an indication of the porosity of the rock;
sonic velocity: collects continuous measurements of in-situ acoustic properties (P and S wave velocities); useful for lithology mapping, rock properties, fracture mapping and rock mass characteristics;
magnetic susceptibility: measures changes in the distribution of magnetic minerals (e.g. magnetite, pyrrhotite) caused by lithological changes and hydrothermal alteration; commonly used to differentiate kimberlite facies; and temperature: measures changes in fluid temperature related to fluid flow in the borehole.
CORE LOGGING PROCEDURES AND SAMPLE SELECTION
Throughout the surface and core drilling programs, the geotechnical and geological core logging was carried out at the main exploration core logging facility. Once a core hole was completed, all of the drill core boxes were transported to the main exploration core logging facility and stockpiled on a per hole basis.
All of the geotechnical logging and photographic records were undertaken by SRK before the core was marked and cut for detailed core logging and sampling.
Once a core hole was geotechnically logged, the Shore geologist completed all geological descriptions into SQL-based logging software. All geological descriptions were encoded and standard codes were utilized during the program. For each core hole, the following samples and testwork were carried out for each major kimberlite facies/lithological break:
bulk density samples;
whole rock geochemistry samples; and
ore dressing – communition samples: drop test samples (“T10”) and scrubbability (“Ta”)
samples and unconfined compressive strength (“UCS”) samples.
All core was digitally photographed. For each photograph, the wooden depth markers denoting the driller’s runs as well as a marker board bearing the hole number, date, wet or dry state of the core, box numbers and interval were recorded onto the digital photograph. The digital photographs for each completed core drill hole were downloaded as individual JPEG computer files saved in individual drill hole folders and incorporated into the project database.
P&E Mining Consultants Inc. NI 43-101 Technical Report No 159 Shore Gold Inc. - Star Diamond Project Resource Estimate Update
Page 45 of 109