▁and ▁total ▁dissol ved ▁sol ids . ▁Iron ▁is ▁the ▁most ▁common ▁metal ▁in ▁abandoned ▁mine ▁d rain age , ▁but ▁al umin um ▁and ▁mang an ese ▁occur ▁as ▁well . ▁It ▁may ▁also ▁have ▁a ▁high ▁water ▁temperature ▁and ▁an ▁alter ed ▁p H , ▁though ▁the ▁characteristics ▁of ▁abandoned ▁mine ▁d rain age ▁depend ▁heavily ▁on ▁the ▁area ' s ▁ge och em istry . ▁Other ▁signs ▁of ▁abandoned ▁mine ▁d rain age ▁include ▁high ▁sul f ate ▁levels ▁and ▁s ilt ation . ▁Ac id ▁mine ▁d rain age ▁has ▁a ▁p H ▁of ▁less ▁than ▁ 7 , ▁while ▁al kal ine ▁mine ▁d rain age ▁has ▁a ▁p H ▁of ▁greater ▁than ▁ 7 . ▁ ▁The ▁concentr ations ▁of ▁met als ▁in ▁abandoned ▁mine ▁d rain age ▁can ▁range ▁from ▁several ▁to ▁several ▁thousand ▁parts ▁per ▁million . ▁In ▁Pennsylvania ' s ▁Co al ▁Region , ▁it ▁has ▁an ▁iron ▁concentration ▁of ▁less ▁than ▁ ▁and ▁a ▁p H ▁of ▁close ▁to ▁ 7 . ▁ ▁Ab andon ed ▁mine ▁d rain age ▁can ▁cause ▁affected ▁streams ▁to ▁take ▁on ▁a ▁bright ▁orange ▁color . ▁ ▁Environment al ▁effects ▁Ab andon ed ▁mine ▁d rain age ▁affect s ▁streams ▁world wide . ▁A ▁ 2 0 1 7 ▁United ▁Nations ▁Environment al ▁Program me ▁( UN EP ) ▁report ▁documented ▁" w ides p read ▁destruction " ▁from ▁min ing ▁waste ▁that ▁is ▁released ▁into ▁the ▁environment ▁as ▁a ▁result ▁of ▁dam ▁fail ures . ▁