White’s Electronics MXT Pro - Manual (Page 19)

1
Ground phase indications are a doubled edged sword.
Higher numbers simply mean predominately ferrous (iron)
such as black sands / magnetite. Lower numbers simply
mean less iron and/or predominately conductive nonfer-
rous (not of iron) content, such as gold per ton of rock. So
in a dry wash, outcropping, or vein, a shift in either direction
(higher or lower numbers) may be of interest. For example a
black sand streak may have a lot of flour gold at one end. It
will indicate a high ground phase number on the end without
the flour gold, and a lower ground phase on the end with the
flour gold. The same applies to veins or an outcropping. It
is the change that brings about the interest more so than if
it is either high iron (high number) or high conductive (lower
numbers).
Knowing that the ground is high iron (magnetite), outlin-
ing black sand pockets (the likely area gold will be found),
checking veins for consistency (change), and comparing
rock samples for possible assay, are the common uses of
ground phase. Again, change is of the most interesting,
more so than the direction of the change.
Chapter 4 MXT Pro Display
3. GND- Indicates the phase (measurement) of the
ground. This is useful in two different environments.
A. Use Ground Numbers primarily to Find Gold
Bearing Ground in a Dry Wash. Within a dry wash the
gold will settle with the heavier materials (black sands).
When searching you notice the ground phase is declin-
ing (lowering in number), generally you are working
further away from the heavy black sand deposits. If
you notice the ground phase is increasing, generally
you are working toward (closer) to the heavier depos-
its. By following the more intense ground phase (higher
numbers) you increase your likelihood of finding nug-
gets within the heavier material (black sands).
B. Checking outcropping or veins, the ground phase
can also be useful in a similar way by indicating the
consistency or change of the veins ground phase.
Generally speaking, the ground numbers will hold fairly
consistent in most open terrain areas, such as hydrau-
lic sites and desert areas. GND readings in the high
70’s and 80’s are considered heavy iron mineralization.
Alkali or salt areas will display much lower numbers,
possibly into the 30’s and 40’s.
NOTE- Watching the change in Ground Number in the upper right of the display, you will first look for a change to a high
number indicating high mineralization or black sand. When that streak is identified you will then look for the Ground Number
to lower again at one end of the streak indicating where the flour gold or gold ore may be concentrated.
Alkali or salt area in a dry wash
Black sand streak-heavy iron mineralization
Flour gold
concentration at
one end of black
sand streak
GND = 0
GND =
GND = 4