Some may find this helpful with why we are on about this anomaly above left of ARVD-146 as shown on EM Target image from announcement dated 9-9-11.
An electromagnetic anomaly.
The search for a buried sulphide deposit often begins with an airborne geophysical survey.
Some sulphide minerals are magnetic (i.e. pyrrhotite) and therefore may cause a measurable perturbation in the earth's magnetic field in the vicinity of the deposit; others are good electrical conductors, and can measurably affect the strength and orientation of electromagnetic fields in their vicinity. In conducting an airborne survey, the aircraft systematically crisscrosses the property while sensitive instruments on board measure the earth's magnetic field and the intensity of electromagnetic fields.
"Anomalies", or unexpected perturbations in these fields, are recorded and compared with responses theoretically expected from sulphide bodies.
Airborne geophysical anomalies may indicate the presence of sulphides and are excellent targets for further exploration; but they may also result from other geological features; grab samples with interesting assays clearly indicate the presence of mineralization on the ground, but provide little indication of the potential size or overall grade of the occurrence; channel samples provide a good systematic sampling of mineralization at outcrop scale and an indication of the width of the mineralization as well diamond drill holes normally provide the first three-dimensional picture of an occurrence. assays of drill core provide vital grade and width information, both of which must be considered in evaluating the significance of a result.
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