贫矿石 meaning in English

base ore
dredge ore
halvans
halvings
low-grade ore

The age of jinchuan body was estimated between 1300ma ~ 1500ma ; period of time . the age of jinchuan body was estimated between 1300ma - 1500ma ; disseminated ore is about ~ 1217ma ; sideronitic ore is about 960ma and massive ore is about 911 ma
其成岩年龄可能在13亿年到15亿年之间；浸染状贫矿石主要形成年龄约1217ma ；海绵陨铁矿石主要形成年龄约960ma ；而块状矿石形成年龄911ma左右。