Geological characteristics and mineralization of sandstone type uranium deposit in Baiyanhua area, Western Erlian Basin

This paper is the result of mineral exploration engineering. [Objective] In recent years, the exploration of sandstone uranium ore in the north has progressed rapidly, and Baiyanhua uranium ore is a newly discovered medium-sized sandstone uranium ore source in the Chuanjing Depression of the Erlian Basin. The systematic study of sandstone uranium ore in Baiyanhua area is intended to provide some valuable references for the prediction of sandstone uranium ore search and the study of mineralization pattern in Chuanjing Depression of Erlian Basin. [Methods] Based on drilling data compilation, map compilation study, systematic sampling, microscopic analysis, and geochemical data compilation, the author elaborates the geological conditions of ore formation, ore body distribution, ore characteristics, and the tectonics, sedimentary filling, and fluid action of Chuanjing Depression in the mining area, and discusses the sandstone type uranium ore formation pattern in this area. [Results]The main ore-bearing level in the study area is the upper section of the Lower Cretaceous Saihan Formation, and the ore bodies are relatively gently spreading in the east and high west. The uranium minerals are mainly uraninite, mainly in gray and dark gray-black sand conglomerates. In the region, the braided riverdelta system is mainly developed, the sand bodies are widely distributed and well connected, and the redox zone is developed in the center of the river, which provides favorable conditions for regional mineralization by mineralizing fluids and reducing gas transport and uranium source material transport. [Conclusion] The mineralization pattern of uranium ore in Baiyanhua area is that the uranium-rich fluids from the Baiyanhua Bulge occurred at the end of sedimentary interruption in the upper part of the Lower Cretaceous Saihantala Formation, and the uranium ore bodies were formed by diving and infiltration of uranium-rich fluids from the Baiyanhua Bulge, and the Baiyanhua Bulge was covered by sediments after the deposition of the Erlian Formation, and interstratified oxidation mineralization occurred in due course.