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What is Mise a’ la masse?
Mise a’ la masse is a “three point” pole-dipole electrical geophysical method that uses an applied voltage to determine the dimensions of a mineralized ore body. When a voltage is applied to a mineralized outcrop with an opposite polarity applied to a second point far from the outcrop, current will flow through the mineralized zone. Voltage potentials are measured to create voltage contours surrounding the mineralized area. The resulting contour map will give an accurate picture of the shape of a subsurface mineralized area.
Mise a’ la masse survey:
A mise a’ la masse survey is conducted using a DC power source. A current cable is connected to a mineralized outcrop or borehole and a second cable is connected to a point far away from the mineralized area. As voltages are measured on the surrounding area, a database of measurements and their associated GPS location is created. A computer contour mapping package is used to create a map of the equipotential voltage contour lines. Contour lines define the direction (strike) and the dip of an ore body in the earth.
Borehole Mise a’ la masse:
When boreholes are available, it is possible to measure voltage potentials, and create contour maps at different levels into the earth. Each contour map gives insight to the dimension of the ore body at each different level. An accurate three-dimensional presentation is obtained.