Modelling spontaneous mineralization potentials with a new integral equation

Furness P. (1992) Modelling spontaneous mineralization potentials with a new integral equation. Journal of Applied Geophysics, 29 2: 143-155. doi:10.1016/0926-9851(92)90005-6


Author Furness P.
Title Modelling spontaneous mineralization potentials with a new integral equation
Journal name Journal of Applied Geophysics   Check publisher's open access policy
ISSN 0926-9851
Publication date 1992-01-01
Sub-type Article (original research)
DOI 10.1016/0926-9851(92)90005-6
Volume 29
Issue 2
Start page 143
End page 155
Total pages 13
Subject 1908 Geophysics
Abstract A modified physical model is proposed for spontaneous mineralization potentials. It neglect the effect of surface polarization but accommodates the resistivity of the mineralized zone and assumes a continuous variation of the primary source strength with depth. An integral equation technique is developed to solve the boundary value problem relevant to the proposed physical model. It considers the stationary current flow due to a surface of potential discontinuity existing in a conducting environment with piecewise constant conductivities. The technique is applied to the study of the spontaneous mineralization potentials developed in a particular two-dimensional earth. Results of these numerical experiments show that the proposed model predicts the essential features of spontaneous potential behaviour both on the surface of the earth as well as in drill holes. It is demonstrated that the behaviour of the spontaneous potentials is independent of the absolute magnitudes of the earth conductivities - depending rather on the ratio of the conductivity of the mineralized zone to that of the country rock. The effect of increasing this ratio from unity (zero resistivity contrast) to infinity (perfect conductor) is shown to dramatically influence the magnitude of the observed spontaneous potentials and to a somewhat lesser extent the shape of the surface S.P. profile. The external self potentials are found to be dependent only on the difference in the imposed potential drop existing from top to base of the mineralized zone, i.e. they depend on the gradient of this potential difference as a function of depth in the present physical model. The internal potentials however depend on the particular values of the potential difference existing over the entire surface of the ore zone.
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 13 Sep 2016, 12:05:52 EST by System User