COLLECTIONS I\ ECONOMIC GEOLOGY AND METALLCRGy. 



11 



are sent out to gather up all the loose gold and follow along to the 

 sluices, and there gather up the amalgam. This amalgam is properly 

 purified and then heated in a retort to drive otf mercury, which is then 



■' PTal 



ei: 



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 Tieavn Jlfvn erals 



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Fig 1. 

 Scheme showinj; hydraulic niiuiup 



ready for use ngain. The retorted or sponge gold is sold to tiie mint, 

 as are also the uuggets and coarse dust. 



