Mithat VICIL, İbrahim ALP, Hacı DEVECİ, Oktay CELEP

The effect of mineralogical structure on the cyanidation of Gold ores

Bu çalışmada, Mastra ve Kaletaş (Gümüşhane - Türkiye) cevherlerinin cevher zenginleştirme karakteristiklerini belirlemek için mineralojik özellikleri ve cevher içerisindeki altın dağılımları araştırılmıştır. Altın kazanımı için siyanür liçinin uygulanabilirliğini belirlemek amacıyla; liç deneyleri gerçekleştirilmiştir. Kaletaş cevheri baskın olarak kuvars, kalsit, realgar, orpiment, organik karbon ve piritten oluşmaktadır. Altın taneleri (6,8 gr/t) kuvars gangı içerisinde 1-44 mikron boyutlarında elektrum olarak bulunmaktadır. Mastra cevherinde ise altın taneleri kuvars gangı ve cevher mineralleri içinde inklüzyonlar şeklinde görülmekte ve 5-300 mikron boyutlarında bulunmaktadır. Mastra ve Kaletaş cevherlerinin altın kazanımları 24 saat NaCN liç sürelerinde sırasıyla % 90-95 (% 80'i -75 pim) ve % 65-70 (% 80'i -12 fim) olarak gerçekleşmiştir. Elde edilen Uç verimleri mineralojik analiz sonuçlarıyla uyumluluk göstermektedir. Sonuç olarak mineralojik analiz, siyanür liçi yada diğer yöntemler ile yüksek yada düşük Au kazanımın nedenini bulmak için başarılı bir metot olarak görülmektedir.

Altın cevherlerinin siyanür liçinde mineralojik yapının etkisi

In this study, the mineralogical characteristics ofMastra and Kaletaş (Gümüşhane - Turkey) gold ores and the distribution of gold within the ore were examined in order to determine their ore processing characteristics. The leaching tests were carried out to determine the technical viability of the application of cyanide leaching for the recovery of gold. Kaletaş ore is mainly composed of quartz, calcite, realgar, orpiment, organic carbon and pyrite. Gold particles (6.8 git) occur in the form of electrum at 1-44 microns in size in a quartz gangue. Gold particles (26 git) in the Mastra ore is observed both in a quarts gangue as irregular particles and in ore minerals as inclusions in size from 5 to 300 microns. The gold recovery rates ofMastra and Kaletaş ores were found to be % 90-9$ (>80% passing 75 jum) and % 65-70 from the ore (>80% passing 12 pim) over a NaCN leaching period of 24 hours, respectively. The mineralogical analysis is agreed with the high or low recovery results of gold ore. As a result, it is seen that the mineralogical analysis is a successful method to find the reason for poor or high Au recoveries by cyanidation or by other techniques.

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