| Citation: | KANG Bo，NING Juntao，GAO Zhuolong，et al. Occurrence state of cobalt in Jingchong copper-cobalt deposit in Northeast Hunan Province, China[J]. Bulletin of Geological Science and Technology，2025，44（4）：167-184 doi: 10.19509/j.cnki.dzkq.tb20240724
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The Jingchong copper-cobalt deposit, located in the ore-concentration area of northeastern Hunan Province, contains medium-scale cobalt resources. However, the cobalt occurrence and the relationship between copper and cobalt mineralization remian unclear.
Based on detailed underground mine investigations, combined with microscopic observation, μ-XRF scanning, backscattered electron imaging (BSE), and electron probe quantitative analysis, the mineralization stages were divided, and the cobalt occurrence and the relationship between copper and cobalt mineralization were studied. We proposed the comprehensive utilization of cobalt .
The results indicate that the cobalt occurrence in the Jingchong copper-cobalt deposit can be classified into two major categories. The first category consists of invisible cobalt hosted in coarse-grained pyrite, where cobalt enters the interior of coarse-grained pyrite through a dissolution-reprecipitation process. The second category is the independent cobaltite mineral, which is further subdivided into four different occurrences: cobaltite occurring as a rim or interstitial texture along the margins or within the interior of coarse-grained pyrite; cobaltite located at the edge of the porous within coarse-grained pyrite; fine-grained cobaltite-pyrite aggregates hosted in quartz adjacent to the coarse-grained pyrite; and fine-grained cobaltite-pyrite aggregates oriented and distributed in the quartz growth bands. In terms of cobalt resource contribution, invisible cobalt in coarse-grained pyrite dominates. Additionally, the mineralization sequence indicates that cobalt mineralization mainly occurs in the intermediate stage of the hydrothermal period, while copper mineralization occurs in the late stage, and lead-zinc mineralization is nearly simultaneous with or slightly later than copper mineralization.
Due to the relatively low content of cobaltite minerals and its grain size predominantly less than 30 μm, conventional mineral processing fineness is difficult to effectively separate them. Therefore, the focus of comprehensive cobalt utilization should be on the coarse-grained cobalt-rich pyrite. The delineation of cobalt-rich ore bodies and the optimization of beneficiation process could potentially enhance the cobalt grade in sulfide concentrates and achieve comprehensive cobalt utilization.
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