344 Ifo Uses 



firft fmclted, and brought to black-copper, and this, 

 at length, after feparating or draining the filver, 

 made pure or fine. Here I have only to make 

 mention of the crude- working or fmelting, as py- 

 rites is ufed therein, and is, not only in this cafe, 

 the principal agent, but alio, in regard to its other 

 nfes, for fulphur, vitriol, and arfenic, here the 

 moll important thing. 



Now the ores, when landed at the day, are firft 

 picked and forted ; what is quite clean and pure, 

 as lead- glitter, black-lead; or very noble, as red- 

 goldifh or white goldifh (though thefe are not al- 

 ways quite pure) is roafted, and thus directly taken 

 to the lead-working ; what is quite barren, rocky, 

 and unyieldy, is thrown away. Not only in this 

 picking, but alfo in veins, there is procured much 

 of a middle degree of goodnefs, holding neither 

 much in noble nor ignoble metal, but yet not to be 

 entirely thrown av/ay ; for inftance, firft, highly 

 rocky or Honey mixt-work, as quartz, fpath, kneijs* 

 horn-ftone, cat-filver, Mufccvy-glafs, glimmer, 

 and lime-Rone ; then alfo, in general, with us at 

 Friberg, mock-leady matters, wherein, notwith- 

 ftanding fomething of a good ore, in particular glit- 

 ter, copper-ore, and even nobler matters, either 

 in eyes, or interfperfedly, or in the mod tender 

 fibres, and which can in no wife be feparated with 

 profit.. For, to employ (tamping and warning 

 thereon, would not quit the trouble, or the 

 metal would be wafted and loft, efpecially in the 

 cafe of tender interfperfed noble fpanglcs; and 

 equally unfit would fuch prove for roafting, as by 

 that means the rocky matters, which here caufe the 

 only inconvenience, would not thus be removed or 

 corrected. Now, in order to work fuch ores, the 

 method of crude-working was deviled, and is, hi- 

 therto, 



