ield ' s ▁world wide ▁reputation ▁as ▁a ▁steel ▁city . ▁ ▁Ar ound ▁ 1 7 0 0 ▁there ▁were ▁about ▁si xty ▁workers ▁at ▁D ann em ora ▁residents ▁of ▁the ▁neighbourhood s ▁around ▁the ▁mine . ▁The ▁number ▁of ▁workers ▁who ▁obtained ▁their ▁support ▁from ▁the ▁mine ▁is ▁likely ▁to ▁be ▁several ▁hundred . ▁In ▁each ▁mine ▁large ▁quantities ▁of ▁wood ▁would ▁used ▁in ▁min ing , ▁a ▁method ▁not ▁abandoned ▁until ▁the ▁ 1 7 3 0 s . ▁The ▁reason ▁for ▁this ▁was ▁partly ▁because ▁gun pow der ▁would ▁be ▁more ▁expensive ▁than ▁wood , ▁but ▁also ▁for ▁danger ' s ▁sake . ▁ ▁Through out ▁the ▁mine ' s ▁history , ▁it ▁had ▁problems ▁with ▁water ▁being ▁situated ▁by ▁a ▁lake . ▁A ▁p ile - dam ▁was ▁built ▁during ▁the ▁ 1 7 th ▁century , ▁and ▁water - ▁and ▁wind - power ed ▁p umps ▁were ▁used . ▁In ▁ 1 7 2 8 , ▁at ▁the ▁initi ative ▁of ▁M år ten ▁Tr iew ald ▁( 1 6 9 1 – 1 7 4 7 ), ▁ ▁a ▁steam - dri ven ▁p ump ▁was ▁installed , ▁a ▁New com en ▁atmos pher ic ▁engine , ▁the ▁first ▁in ▁Sweden , ▁but ▁it ▁was ▁never ▁a ▁success . ▁The ▁failure ▁was ▁probably ▁due ▁to ▁the ▁technology , ▁which ▁worked ▁f law lessly ▁in ▁England , ▁being ▁new ▁to ▁Sweden ▁and ▁was ▁run ▁by ▁in ex per ien ced ▁staff . ▁During ▁bl ast ing