The Tianlu sandstone copper deposits located in the Silurian period stratum that belong to the northern part of north Qilan orogenic belt.

• 北祁连天鹿砂岩铜矿床产在北祁连造山带北部志留纪地层中,矿层产于旱峡组灰绿色岩层底部或紫红色岩层的灰绿色夹层中,具有稳定的层位特征。