▁to ▁remove ▁two ▁water falls ▁in ▁the ▁ 1 7 5 0 s , ▁water ▁swe pt ▁away ▁a ▁bl ast ▁furn ace , ▁a ▁mill ▁and ▁two ▁saw m ills . ▁Despite ▁a ▁newly ▁built ▁dam , ▁the ▁mines ▁were ▁flo oded ▁in ▁the ▁spring ▁flo od ▁of ▁ 1 7 9 5 ▁and ▁it ▁took ▁until ▁ 1 8 1 5 ▁before ▁the ▁situation ▁became ▁normal . ▁In ▁ 1 8 0 5 ▁a ▁new ▁steam ▁engine ▁of ▁ 1 0 ▁horse power ▁was ▁installed . ▁ ▁During ▁the ▁century ▁ 1 7 7 0 - 1 8 7 0 , ▁production ▁was ▁between ▁ 1 5 , 0 0 0 ▁and ▁ 2 0 , 0 0 0 ▁t onnes . ▁In ▁the ▁ 1 8 7 0 s , ▁it ▁rose ▁to ▁ 4 0 , 0 0 0 ▁t onnes ▁and ▁exports ▁of ▁p ig ▁iron ▁from ▁the ▁Ö ster by ▁iron works ▁became ▁significant . ▁In ▁order ▁to ▁facil itate ▁ship ments ▁of ▁ore ▁D ann em ora ▁H args ▁Railway ▁( D ann em ora – H args ▁J är n vä g ) ▁was ▁built ▁between ▁D ann em ora ▁mines ▁and ▁H arg sh am n ▁in ▁ 1 8 7 8 . ▁During ▁the ▁ 2 0 th ▁century , ▁production ▁was ▁ 5 0 , 0 0 0 ▁t onnes , ▁but ▁a ▁strike ▁in ▁ 1 9 2 7 ▁stopped ▁operations ▁entirely . ▁Only ▁in ▁ 1 9 3 5 ▁was