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| Titel |
SIP response for volume content of sulfide mineral in artificial specimen |
| VerfasserIn |
Mi Kyung Park, Samgyu Park, Myeong Jong Yi, Jung Ho Kim |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094347
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| Publikation (Nr.) |
 EGU/EGU2014-9753.pdf |
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| Zusammenfassung |
| Spectral Induced Polarization (SIP) method has recently been introduced to enhance mineral
resource exploration techniques in metal ore deposit, South Korea. Because the valuable
mineral ore contains various sulfide minerals such as pyrite (FeS), chalcopyrite
(CuFeS2), and galena (PbS), which show IP (Induced Polarization) effect. The
conventional IP method was not adequate to find these various sulfide minerals
because of certain restrictions, including limited frequency. In order to solve this
problem, the SIP (Spectral Induced Polarization) method was introduced, which
measures responses like as amplitude (or resistivity) and phase for a wide frequency
band. The application of the SIP method has been increasing as an exploration
technology for mineral resources, because it can be used to acquire and analyze high
quality IP data according to the spectral frequency. SIP responses are strong in the
presence of the sulfide minerals; however, sufficient study on the characteristics of the
SIP response for the various sulfide minerals is not available so far. In this study,
in order to identify the SIP response characteristics of sulfide minerals, the SIP
method was used in the laboratory; on artificial specimens filled with glass beads and
sulfide minerals. The experiment was controlled by the changing volume content,
and grain size, of three kinds of sulfide minerals (i.e., chalcopyrite, pyrite, and
galena). The grain sizes of the sulfide minerals were varied in five steps: under
0.5 mm, 0.5 - 1.0 mm, 1.0 - 2.0 mm, 2.0 - 2.85 mm, and 2.85 - 4.0 mm, while the
grain size of the glass beads was in the range of 0.75 - 1.0 mm. Variation of the
volume content of the sulfide mineral was divided into eight grades. The sulfide
minerals occupied 0.5, 1, 2, 3, 5, 7, 10, and 20 percent of the total volume 250 ml
specimens. The volume content was converted from the weight using the density of a
standard volume of 100 ml for each grain size. The results show that phase response
increased with increasing volume content of ore, and that critical frequency got lower
with increasing grain size. Critical frequency measurement also showed that, in
comparison with chalcopyrite content, pyrite was lower and galena was higher. In
addition, we proposed empirical equations for the relationship of volume contents with
chargeability, volume contents with phase on critical frequency. Therefore, we expect that
quantitative estimation of ore grade and calculation of tonnage, is now possible by
conversion of SIP responses to volume content of the sulfide minerals present in samples. |
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