Forms of Strategic Metals Occurrence in the Briketno-Zheltukhinskoe U–Mo–Re Deposit and an Effective Method for Their Extraction

The forms of ore element occurrence in U–Mo–Re-carbonaceous ores of the Briketno-Zheltukhinskoe deposit, anomalously enriched in rhenium (CRe ~ 20 g/t, maximum up to 570 g/t), were determined for the first time. The experiments were carried out using the sequential desorption method on a set of the rhenium samples with the highest Re concentration and collected in coal-bearing sandy paleochannel deposits of the Visean age in the Moscow lignite Basin. The results of treatment of the carbonaceous ore samples (with a pyrite content of ~3–10 vol %) using various reagents: a significant portion of Re (2.3–53.4% of the total), Mo (8–52.5%), and U (~1–9%) in sorbed form is associated with organic detritus. It is assumed that Re, Mo, and U are stably bound in the composition of organometallic compounds dispersed in the organic matrix; these metals are weakly bound (~1–14%; ~1–8.5%; and ~1–7%, respectively) and are capable of aqueous migration. In the carbonaceous samples, the Re content increases along with U, Mo, Zn, Co, Pb, Ni, Ce, As, Y, Se, and the amount of dispersed organic matter.