CIlEMWJ!RY 8A-D TPJDUS'I'RY 116 arsenic rcniovcd froiii thc spciss nre prcsent ns sulphides in the nlknlinc iiintte, and licnce dissolvc with ease. .Kcncc tlic rilknliiic innttc is simply ground nnrl transfcrrcd to nn iron tnuk of wutcr, nntl lrcntcd by nn open stcnin pipe, wlicrcby 'all tlicsc soliiblc mntcrinls nrc directly rcniovcd.
Whnt coppcr, Icnd, iron, rind zinc, wcrc prcscnt in tlic skimmings are conccntrutcd in this insolublc rcsiduc froiii tlic washing, togcthcr with the gold and nay little nickel rcniovecl froin thc spciss. KO clnirns to origiiinlity cnn bc mndc in this proccss, as i t has bccn widcly ripplied in tlic pnst for scprnting tin nnd antimony froni othcr busc nictnls, but it wns abnntlonetl bccnusc of tlic losses siistnincil, particulnrly wit,li tin. Tlic snlpliidcs of tin, nntiniony, mid nrscnic nrc nll volntilc, iiiid licncc throughout tho nlkrilinc siilphiclc sniclting, tlicsc mct~nls nrc caused t o pnss oil, c~cu nlthoiigh coinparrrtivcly low tcnipcrnturcs urc iiinintirincd. Tlic prccious metal sincltcrs do not t~plicnr to bc concerned with tlic cconomicul recowry of the I m c nictnl coustituents, ns the iiiriin fcntiirc is to rccliiiin tlic ~irccions nictiils. \'hiIst thc bulk of tllc tin, irntimony, rind iirscnic piiss into thc alkidiiic innttc, nn iipprccinblc proportion (piirticulnrly of tlic latter 1nct:iI) is volntilizcd.