Abstract:
The Linlaoping Gold Mine is located in the Youjiang Basin, which has superior mineralization conditions and is a key prospective area for searching Carlin-type gold deposits. The bedrock in the area is rarely exposed, and traditional geological prospecting methods are severely restricted in the area. However, its rich water system and lush vegetation are conducive to the formation and preservation of water sediment and soil, providing basic conditions for the formation of secondary halos. In order to make a breakthrough in ore prospecting in this area, a 1∶50 000 stream sediment geochemical survey is carried out, and the comprehensive Au-As-Hg-Sb anomalies of AS-3 Bayan (class A2) and AS-8 Laihua (class B2) are delineated. Through anomaly verification work, the two are further reduced to a 1∶10 000 soil Au-As-Hg-Sb anomaly in Linna and Laihua, respectively. The anomaly distributed in a nearly SN trending strip along the core of the Linlaoping Anticline, with high consistency with the 1∶50 000 water system anomaly and good element compatibility. The abnormal concentration is revealed through the exploration of trenches (soil stripping) engineering, and 6 gold ore bodies and 8 gold mineralization bodies are delineated, which are confirmed to be mine induced anomalies. The anomalous concentration center of soil Au-As-Hg-Sb basically reflects the location of gold mineralization bodies and is a very effective indicator element for mineral exploration. The gold ore body occurs directly in the fracture zone of the core of the Linlaoping Anticline or the secondary fissure on its side. Silicification, limonitization, pyritization and kaolinization are closely related to mineralization. The methods of stream sediment geochemical survey and soil geochemical profile survey have achieved remarkable results in ore prospecting in this area. The methods are worthy of reference in search for carlin-type gold deposits in the Youjiang Basin.