Auriferous Mineralizations in The Murgul-Artvin-Maradit Area (Northeastern Turkey)

The auriferous mineralizations, as the subject of this paper, are placed in the Murgul, Artvin and Maradit surroundings, in the extreme northeastern part of the Turkey. The area is between Black Sea coast to the northwest and Çoruh river to the east, northerly bordered by the Georgian - Turkish border and by the Artvin - Fındıklı line to the south, including spring of the Murguldere. The field is made up of volcanic, volcanic-sedimentary, sedimentary and granitoid formations, from Jurassic to Quaternary time. In that period numerous composite petrogenetic complexes had been formed. The oldest is volcanic and volcanic-sedimentary complex including volcanic rocks of andesitic or intermediate-acidic character, Jurassic in age. They are accompanied by the Iskalka köprüsü and Budiyet köprüsü copper mineralizations. Gold in this complex has not been studied yet. This rock assemblage is overlain by the acidic rhyolitic and rhyodacitic volcanic and volcanic-sedimentary complex, associated with large copper deposits and a large number of still not explored or partly investigated copper occurrences, formed during the Upper Jurassic - Lower Cretaceous. The gold-bearing, related to this complex, is not distinctly developed. According to the present knowledge, precious metals as trace elements are registered in copper deposits in the Murgul surroundings (Anayatak, Çakmakkaya, Aduca dere, Kilise tepe etc), then in the Artvin vicinity (Kuvarshan, Irsa Maden, Sinkot, Seyitler and Umasen). The similar gold and silver appearances are to be expected in the other copper mineralizations, particularly in the Hopa circles (Peronot, Sivrikaya, Kutunit and others). These copper occurrences and deposits are characterized by relatively low gold grades (mostly less than 0.5 ppm) and variable silver contents, with locally high grades (from traces to 180 ppm). However, if large copper reserves are taken into consideration, amounting more than 100 million tons, low grades became significant; at least 50 tons of gold and several hundred tons of silver is expected to be found. The next petrogenic complex was formed during the Upper Cretaceous - Paleogene time. This is a composite petrogenic unit, enclosing volcanic, volcanic-sedimentary and sedimentary formations. They represent a complete development, beginning from basalts and spilites, throughout andesites, to dacites and rhyolites. The most important rocks in this complex, bearing precious metals, associated with copper, zinc and lead mineralizations, are andesites, partly sediments, composed of re-deposited products of andesitic volcanism. In this petrogenic rock assemblage in the related metallogenic stage, two types of gold-bearing mineralizations are distinguished. These are the Akarþen, Hohur sırtı and Madenköy base metal deposit near Çayeli, with gold grading up to 11,43 ppm (in Madenköy) and silver contents ranging from several tens grams per ton of ore up to 241 ppm, including even 350 ppm in Akarþen galena. In the same complex, including the potentially ore-bearing sediments, such as tuffaceous sandstones, contents of 0,11 ppm gold and 2,25 ppm silver have been found. To the next precious metals type belong mineralizations nearby Pehlivan köy near Maradit. They occur in the highly hydrothermally altered andesites, with pyrite and copper minerals. As a special alteration type, adularization is remarkable, indicating the epithermal copper origin and accompanying the gold mineralizations. In only one sample 0,72 ppm gold and 50 ppm silver were detected. These features indicate it as a special mineralization type. The third of auriferous mineralizations is found in the Melo dere ravine (Gorge) near Artvin. This is the quartzdiorite, Eocene in age, locally bearing high chalcopyrite concentrations, with low gold grades (up to 0,03 ppm), but with higher silver (7,2 ppm). As it is visible from the presented facts, the Murgul - Artvin - Maradit area is considered as very interesting for the gold-bearing copper, zinc and lead mineralizations

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Maden Tetkik ve Arama Dergisi-Cover
  • ISSN: 0026-4563
  • Yayın Aralığı: Yılda 3 Sayı
  • Başlangıç: 1950
  • Yayıncı: Cahit DÖNMEZ