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Paper Information

Journal:   INTERNATIONAL JOURNAL OF MINING AND GEO-ENGINEERING   2017 , Volume 51 , Number 1; Page(s) 97 To 104.
 
Paper: 

AN IMAGE ANALYSIS-BASED METHODOLOGY FOR CHROMITE EXPLORATION THROUGH OPTO-GEOMETRIC PARAMETERS; A CASE STUDY OF FARYAB AREA, SE OF IRAN

 
 
Author(s):  ZIAII MANSUR*, POUYAN ALI, YOUSEFZADEH RAHMAN, GHIASI FREEZ JAVAD
 
* FACULTY OF MINING, PETROLEUM AND GEOPHYSICS, SHAHROOD UNIVERSITY OF TECHNOLOGY
 
Abstract: 

Traditional methods of chromite exploration are mostly based on geophysical techniques and drilling operations which are expensive and time-consuming. Furthermore, they suffer from several shortcomings such as lack of sufficient geophysical density contrast. In order to overcome these drawbacks, the current research was carried out to introduce a novel, automatic and opto-geometric image analysis (OGIA) technique for extracting the structural properties of chromite minerals using polished thin sections prepared from outcrops. Several images were taken from polished sections through a reflected-light microscope equipped with a digital camera. The images were processed in filtering and segmentation steps to extract the worthwhile information of chromite minerals. The directional density of chromite minerals, as a textural property, was studied in different inclinations, and the main trend of chromite growth was identified. Microscopic inclination of chromite veins can be generalized for exploring the macroscopic layers of chromite buried under either the surface quaternary alluvium or the overburden rocks. The performance of the OGIA methodology was applied on a real case study, where several exploratory boreholes were drilled. The results show that the microscopic investigation outlines through image analysis are in good agreement with that of obtained from interpretation of boreholes. The OGIA method represents a reliable map for absence or existence of chromite ore deposits in different horizontal surfaces. Directing the exploration investigations toward more susceptible zones (potentials) and preventing from wasting time and budget are the major contributions of the OGIA methodology. It helps to make optimal managerial and economical decisions.

 
Keyword(s): OPTO-GEOMETRIC PARAMETERS, CHROMITE ORE DEPOSITS, MICROSCOPIC INCLINATION, DIRECTIONAL DENSITY, THIN SECTION IMAGE
 
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