▁Natural ▁resources ▁Min er als : ▁coal , ▁gold , ▁silver , ▁z inc , ▁nick el , ▁mang an ese , ▁cl ay , ▁and ▁dol om ite ▁H yd rop ower ▁ ▁There ▁is ▁a ▁thermal ▁generating ▁plant ▁supplied ▁with ▁coal ▁from ▁fields ▁in ▁Q ing hai . ▁In ▁addition , ▁there ▁is ▁a ▁hydro elect ric ▁station ▁at ▁Zh ul ama ▁G orge ▁in ▁G ans u , ▁and ▁a ▁large ▁multip ur pose ▁dam ▁has ▁been ▁built ▁in ▁the ▁Li uj ia ▁G orge ▁on ▁the ▁Y ellow ▁River ▁above ▁L anz hou . ▁ ▁Indust ry ▁Main ▁indust ries ▁include ▁text ile ▁mill s , ▁rub ber ▁processing ▁and ▁fert il izer ▁plants , ▁an ▁oil ▁ref in ery , ▁pet ro chem ical s , ▁mach in ery , ▁and ▁met all urg ical ▁industry . ▁ ▁G ans u ▁has ▁one ▁of ▁the ▁largest ▁oil ▁ref iner ies ▁in ▁the ▁country ▁and ▁L anz hou ▁itself ▁is ▁the ▁center ▁of ▁the ▁province ' s ▁pet ro chem ical ▁industry . ▁The ▁ref in ery ▁is ▁linked ▁to ▁the ▁fields ▁at ▁Y umen ▁by ▁pipeline . ▁It ▁also ▁manufact ures ▁equipment ▁for ▁the ▁oil ▁industry . ▁ ▁L anz hou ▁has ▁a ▁large ▁text ile ▁industry , ▁particularly ▁noted ▁for ▁the ▁production ▁of ▁w ool en ▁and ▁le ather ▁goods . ▁In ▁addition , ▁L anz hou ▁produces ▁locomot ives ▁and ▁rolling ▁stock ▁for ▁the ▁north western ▁rail ways , ▁as ▁well ▁as ▁machine ▁tools ▁and ▁min