Mo-bearing sandstone discovered in the Minzhu-Taiping area, Muchuan County, Sichuan Province, is a new type of mineral deposit-sedimentary sandstone type Re-Mo (-Os) deposit. X-ray powder diffractionanalysis shows that the finely crystalline-microcrystalline scaly Mo-bearing mineral in the ore is crystalline molybdenite. High-precision mass spectrbmetry indicates that the contents of the dispersed element Re and plat-inum-group element Os are high in molybdenite. So the two elements can be recovered for industrial uses. High-precision Re-Os isotope dating suggests that the Muchuan Re-Mo (Os) deposit form in 202~206 Ma, synchroneously with the ore-bearing Mesozoic red bed basin sandstone. No sign of hydrothermal activity or tec-tonic setting has been found. The authors think that the molybdenite is the product of the syngenetic sedimenta-ry period. This discovery and research are of great theoretical significance and practical value for the study of mineralogy and the geology of mineral deposits.