Περιγραφή ερευνητικών γεωτρήσεων και χημική σύσταση μεταλλεύματος του κοιτάσματος χρωμίτη στο Ριζό Γρεβενών = Description of the exploration drillings and the chemical composition of the Chromite deposite at Rizo Grevena, NW Greece.

Μαγδαληνή Χώρη


Στην παρούσα διπλωματική εργασία παρουσιάζονται στοιχεία από την ερευνητική δραστηριότητα της εταιρείας «ΕΛΛΗΜΕΤ ΕΛΛΗΝΙΚΑ ΜΕΤΑΛΛΕΙΑ Α.Ε.» που περιλαμβάνει περιγραφές κάποιων ερευνητικών γεωτρήσεων και χημικών αναλύσεων από αντιπροσωπευτικά δείγματα μεταλλοφορίας της θέσης Ριζό Γρεβενών του όρους Βούρινου. Οι χημικές αναλύσεις αφορούν αντιπροσωπευτικά δείγματα κάθε τύπου μεταλλοφορίας, όπως επίσης και των τυπικών σχηματισμών που συναντώνται στην θέση αυτή. Τα δείγματα ελήφθησαν κατά τη διάρκεια της γεωλογικής χαρτογράφησης από την Εταιρεία, σε επιλεγμένες εκλεκτικές θέσεις με βάση παλαιότερη χαρτογράφηση της περιοχής. Επιπλέον, αναλύθηκαν ακόμη δύο δείγματα των οποίων η δειγματοληψία έγινε κατά την διάρκεια της επιφανειακής εξόρυξης μεταλλεύματος στην θέση αυτή. Οι αναλύσεις των πρώτων δειγμάτων πραγματοποιήθηκαν σε εξωτερικό πιστοποιημένο εργαστήριο, και περιλαμβάνουν μετρήσεις για όλα τα στοιχεία και ιχνοστοιχεία του μεταλλεύματος. Ενώ τα δεύτερα αναλύθηκαν στο εργαστήριο της εταιρείας και επικεντρώνονται στην μέτρηση της περιεκτικότητας σε Cr2O3 (%). Από την περιγραφή των γεωτρήσεων προκύπτει ότι στην περιοχή κυριαρχεί ο χαρτσβουργίτης με στρώματα δουνίτη. Μέσα στον δουνίτη φιλοξενείται η μεταλλοφορία. Κύριος τύπος μεταλλοφορίας είναι σε ταινίες (Schlieren), διάσπαρτος, μερικές φορές συμπαγής, όπως επίσης κυρίως στον κεντρικό τομέα της θέσης αυτής υπάρχουν ίχνη λεοπαρδάλεως. Με βάση τις γεωτρήσεις που πραγματοποιήθηκαν σε διαφορετικά υψόμετρα με το υψηλότερο να ξεκινάει στα 767 μέτρα, η μεταλλοφορία αναπτύσσεται μεταξύ των 705 με 640 μέτρων, ενώ σε μεγαλύτερα βάθη δεν είναι γνωστό αν υπάρχει μεταλλοφορία λόγω έλλειψης δεδομένων. Η περιοχή διατρέχεται από ρήγματα διεύθυνσης Α-Δ με αποτέλεσμα οι σχηματισμοί να είναι αρκετά τεκτονισμένοι και εξαλλοιωμένοι. Από την χημική σύσταση του μεταλλεύματος προκύπτει ότι στην περιοχή επικρατεί μεγάλο ποσοστό MgO με εύρος από 15.47 έως 47.68% όπως επίσης και SiO2 (8.06-72.07%) ενώ η περιεκτικότητα του μεταλλεύματος σε Cr2O3 και Fe2O3 είναι κατά μέσο όρο 10% περίπου. Τέλος, μικρότερη περιεκτικότητα παρουσιάζεται στο Al2O3 ενώ η πυκνότητα του μεταλλεύματος κυμαίνεται σε ένα εύρος μεταξύ 3.11 και 4.24 gr/cm3.

This study focuses on the chromite deposit at Vourinos in Rizo of Grevena and the data obtained from the exploration drillings of the company “Hellenic Mines S.A”. The main goal was to describe the mineralization and the chemical composition of the ore at representative chromite samples. Chemical analyses were collected from the disseminated, the schlieren, the nodular and the massive chromite outcrops and from the altered and fresh dunites, hartzburgites and pyroxenites of the host rocks. Additional samples were collected during the company’s geological mapping and were analyzed at a certified lab in Finland for a large number of elements. Two more samples were collected from the surface mining site and the chemical analysis was perfomed at the laboratory of the company focusing only in Cr2O3.  The description of the drillings shows that hartzburgite is the dominant rock with layers of dunite. The chromite deposit is found in the dunite layers. The most common types of chromite are schlieren, disseminated and sometimes massive, whereas in the middle sector of the site, nodular type can be found. According to the drilling logging chromite can be found at a depth between 705 and 640 meter. However there are no data below this depth. In this area, there are many faults with a W-E direction which have affected the mineralization and the host rocks. The chemical composition of the deposit shows that the dominant components of the mineralization are the MgO which ranges between 15.47 to 47.68 wt%, and SiO2 (8.06-72.07 wt%). The average concentration  of Cr2O3 and Fe2O3 is 10 wt%. The content of Al2O3 is low and the density of the chromite ore ranges from 3.11 to 4.24 gr/cm3.

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