The Mise-à-la-Masse Method

(Figure 1)

Mise-à-la-masse LS_MS_ 01, LS_MS_ 03 and LS_MS_ 06_REDCORP_September 2.017

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2. THE MISE-À-LA-MASSE METHOD

The basis of this d.c. geoelectrical method for mineral exploration is to earth one current electrode (A)

of a pair in a conducting orebody intersected by a drillhole, the other electrode (B) being far away (at

infinity) and measures the resulting distribution of potentials on the surface when a d.c. current pulse

flows through electrodes A - B. Studies of this type have also been termed "charged-body potential

studies" or "applied potential studies" (D.S. Parasnis).

The MALM method is normally used for mapping ore deposits with high electrical conductivities such

as sulfide bodies. When a voltage is applied between A & B electrodes, electric potential develops which

can be measured on the surface and mapped. Electrical potentials are measured using a pair of

electrodes (M, N) moving at incremental distances along survey lines which extend over the prospecting

area. The shape and size of localized conductive deposits is reflected by the pattern of the electrical

potential measured on the surface.

The electrical potential shows a maximum over the conductive body, so if it is elongated in a particular

direction the potential map at the surface will be elongated as well. The maximum values of potential

will be over the upper edge of the conductive body (see Figure 2).For a homogeneous half-space the

potential map will show a spherical pattern centered on the horizontal projection of the A electrode.

Figure 2.- The Mise-à-la-Masse Method.

Composite Potential Map from MLAM survey on Holes:

LS-MS-01, LS-MS-03, and LS-MS-06

(Figure 2)

Long Section of LS-MS-05 hole

(Figure 3)

LOCATION OF LS-1 SECTOR RESOURCE & “CENTRAL SECTOR” ALONG WITH

NEW (Green) AND HISTORICAL (Black) DRILL HOLES