Hunan unveils prelude to basic ultra-basic rock deposits

The pre-examination project for copper-nickel polymetallic ore in the Yuanchuan Chongqin Mining Area, undertaken by the Hunan Provincial Bureau of Geological Exploration, 418, was started a few days ago, and it is expected to submit one mineral site for further work. The implementation of this project marks the official kick-off of Hunan's search for basic ultra-basic rock deposits.

The basic ultramafic rocks in Hunan Province are widely distributed and numerous, especially in the east of Hunan and southwest of Hunan, but the overall scale is small. In order to achieve breakthroughs in the exploration of basic ultra-basic rock deposits in Hunan Province, the Ministry of Land and Resources of Hunan Province organized a seminar in December 2015. Experts from the conference believed that Hunan in the southwest of Hunan Province is looking for basic ultra-mafic rocks. The breakthrough of the deposit. At the same time, the experts proposed to carry out the evaluation of metallogenic long-term prospects for basic ultrabasic rock masses in the region and verify key rock formations; to focus on the Yuanchong mining area in Tongxian County, and further drill the deep water on the basis of the existing achievements. Verification to find ultra-basic nickel-containing peridotite.

The channel county Yuanchong mining area is located in the transitional belt between the Yangzi platform and the Nanhua platform, which is a typical tectonic setting for the mantle-derived magmatic emplacement and mineralization. It is similar to the similarly known types of ore deposits known at home and abroad, and the metallogenic conditions are extremely favorable. The geochemical conditions are good. From October 2013 to October 2014, the Hunan Provincial Bureau of Geological Exploration 418 carried out pre-inspection work in the area to understand roughly the distribution, alteration, and mineralization characteristics of the basic ultrabasic veins in the area; There are six obvious magnetic anomalies in the inner ring, and the geophysical inference may be an overall anomaly. Through drilling verification, the team found that the surface-basal diabase veins turned into deep-basic ultrabasic pyroxenite veins. The general diagenesis characteristics of ultramafic rocks, combined with the spatial distribution of lithofacies in the adjacent orefields and the outcrop of peridotites, it is inferred that there are nickel-bearing peridotitic rocks in the deep, and it is more likely to find nickel deposits.

It is understood that the tasks and tasks of the pre-inspection work are: on the basis of surface work and comprehensive research, the selection of sparse engineering in key locations will verify the deep nickel-containing peridotite. The overall situation is divided into two stages: surface survey and mid-depth inspection. The first stage mainly carried out the work of detecting the amount of material, the original halo measurement, trenching, rock and mineral testing and other work; the second stage mainly conducted deep drilling verification. The entire project work cycle is one year.