Detection of Porphyry Copper Deposit Using Natural Electromagnetic Fields
First Claim
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1. A method for identifying a possible porphyry copper deposit, comprising:
- flying an airborne sensor over a survey area measuring natural electromagnetic fields in the survey area; and
determining, in dependence on the measured natural electromagnetic fields, if one or more sub-areas in the survey area have a resistivity pattern that corresponds to a predetermined resistivity signature for a porphyry copper deposit, the predetermined resistivity signature including a higher resistivity inner region at least partially surrounded by a lower resistivity outer region.
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Abstract
A method for identifying a possible porphyry copper deposit which includes flying an airborne sensor over a survey area measuring natural electromagnetic fields in the survey area, and then determining, in dependence on the measured natural electromagnetic fields, if one or more sub-areas in the survey area have a resistivity pattern that corresponds to a predetermined resistivity signature for a porphyry copper deposit. The predetermined resistivity signature includes a higher resistivity inner region at least partially surrounded by a lower resistivity outer region
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Citations
14 Claims
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1. A method for identifying a possible porphyry copper deposit, comprising:
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flying an airborne sensor over a survey area measuring natural electromagnetic fields in the survey area; and determining, in dependence on the measured natural electromagnetic fields, if one or more sub-areas in the survey area have a resistivity pattern that corresponds to a predetermined resistivity signature for a porphyry copper deposit, the predetermined resistivity signature including a higher resistivity inner region at least partially surrounded by a lower resistivity outer region. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for identifying a possible porphyry copper deposit, comprising:
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conducting an airborne audio frequency magnetic (“
AFMAG”
) geophysical survey of a survey area measuring low frequency natural electromagnetic fields in the survey area;calculating a plurality of tilt angles of the electromagnetic waves of the low frequency natural electromagnetic fields; and determining in dependence on the calculated tilt angles if one or more sub-areas in the survey area have a resistivity pattern that corresponds to a predetermined resistivity signature for a porphyry copper deposit, the predetermined resistivity signature including a higher resistivity inner region at least partially surrounded by a lower resistivity outer region. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification