Ohirgi o ׳n yil mobaynida oltin qazib olish sanoatida tirgak rudalardan olingan oltin miqdori ancha oshdi. Bundayrudalardan olingan oltin jami 50...70% tashkil qiladi. Keltirilgan ishda oltinni bunday past miqdorda chiqarilishisabablari, rudadagi muhim kattalikda bo ׳lgan bir necha nanometr kattalikdagi yoki nanooltin korib chiqilgan.

Tayanch iboralar: oltinni kattaligi, nanooltin, probirkali tahlil, gravitatsiya, pishirish, biooksidlash.

Over the past decade, the share of gold extracted from refractory ores has increased significantly in the goldmining industry. The extraction of gold from such ores is only 50 ... 70%. In this paper, we consider the possiblereasons for such a low gold recovery, the presence in the ore of a significant amount of gold of severalnanometers or nanogold.

Key words: gold size, nano-gold, assay analysis, gravity, roasting, biooxidation.