5th Biennial Meeting of the Society-for-Geology-Applied-to-Mineral-Deposits / 10th Quadrennial Symposium of the International-Association-on-the-Genesis-of-Ore-Deposits, London, Kanada, 22 - 25 Ağustos 1999, ss.459-462
The Cayeli massive sulphide ore body occurs within Upper Cretaceous dacitic flows and pyroclastics and consists of a massive sulfide lens with varying ore zones and a well-developed mineralised stockwork. The main ore body strikes N30E, plunges 15 to 20 degrees NE and dips 60 to 80 degrees NW. It is 450 m long, 400 m wide, up to 120 m thick and has a minable reserve of 8.87 million tonnes above 880m level grading on average at 5.19 % Cu, 7.54 % Zn, 0.3 % Pb with significant Ag and Au. The ore is primarily clastic in type, and composed mainly of pyrite, chalcopyrite, sphalerite and minor amounts of galena and sulphosalts. Quartz, barite, carbonates and clay minerals are the main gangue minerals. The ore body is divided into three zones: the northern zone, central zone, and southern zone. Using Kuroko ore-type nomenclature, the northern zone is composed of black and clastic black ore at the top and yellow ore at the bottom of the lens. Yellow ore is more extensive in the southern zone. Stockwork type of ore is well developed in the northern zone, These observations may indicate that the ore body underwent a severe brecciation and transportation, mainly from north towards south.