Readings Interpretation - GDD Instrumentation MPP-EM2S Plus Instruction Manual

13. Readings interpretation

13.1 HF/Cond Distinction
In the case of conductive sulphides: The HF response provides an indication of sulphides quantity. The
Conductivity (Mhos/m) provides an indication of sulphides quality. The conductivity of a small and a
large aluminium foil will be similar but the HF response will increase with the size of the aluminium
surface.
13.2 Results Signification
HF RESPONSE: the number in this window represents the value of the HF response.
SCPT 0.001 Magnetic Susceptibility: the number in this window represents the value of the magnetic
susceptibility. As mentioned previously, it is important to note that, in the presence of a conductor,
the MPP-EM2S+ probe will measure the magnetic susceptibility value. In the presence of pyrrhotite
combined with a small amount of magnetite or no magnetite at all, the magnetic susceptibility will be
measured.
COND MHOS/M Calculated Conductivity: it is important to note that in the presence of some
magnetite in the sample, the MPP-EM2S+ probe will overestimate the conductivity value. The « > »
sign appearing before conductivity value indicates that real conductivity is higher than 999999. It is
recommended to take the measurement again on the points marked with > or where the value is
999 999 after reinitializing to make sure that the readings are real.
13.3 Sample Shape and Distance
The measured values could depend on the shape of the sample. For an equivalent content of
conductive/magnetic ore, the response will increase with an increasing surface of contact. In the
same way, the response will decrease with an increasing distance between the probe and the sample,
the probe has to be in contact with the sample.
Instrumentation GDD Inc. 2018-01-16 48