Recommendations for KT-10
Plus
Calibrations
The calibration curves are based on the relation between the measured susceptibility and
the real concentration of a specific type of mineral. The calibration consists of creating a
numerical table or function that will cover all of the different concentrations found in an
ideal sample. The KT-10
Plus
comes with calibration for ideal magnetite.
Recommended Materials for the Calibration Process
1. KT-10
Plus
v2
2. Five plastic bags approx size 8” x 8” or bigger
3. Five samples of a specific local mineral or rock at varying concentrations.
4. A PC with a text editor and the GeoView software.
Sample Preparation
The user must prepare the samples in a consistent geometry to eliminate the deviations
caused by geometric factors or unsuitable shapes. The shape of the samples must conform
to the expected or common shape of real samples that will be measured in future
production. The closer the calibration sample compares to the real samples, the more
precise the measurements will be.
If there is a scenario where the common samples are rocks and the user does want to
crush them prior to taking measurements, then it is recommended to have samples with a
minimum size of 4” x 4” and a thickness of 1.5”. In places where the most common
mineral is in a fine gravel or sand, it is recommended that it be poured into a plastic 8” x
8” bag and formed into the shape of a pillow, with a thickness of approximately 2”.
Calibration Samples Selection
The calibration method expects to cover a wide range of local concentration profiles. For
better interpolation, we recommend samples be taken from the mine or pit and contain
both low and high concentrations. The user can define five points of conversion for the
table and a suitable selection of calibration points can increase precision within a focused
range. For example, if a site has an iron concentration of approximately 30% and this
concentration is found in approximately three quarters of the reserves, while the
remaining reserves have concentrations close to the local maximum (45%, in this case),
the calibration can be configured as presented in the following table
(Figure 138)
.
112
