Agricola, Georgius, De re metallica, 1912/1950

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                <pb pagenum="403"/>
              mentioned proprietors buy it in with the copper; if there be no silver, copper
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              is made direct. </s>
              <s>If such copper ore contains some minerals which do not
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              easily melt, as pyrites or
                <emph type="italics"/>
              cadmía metallíca fossilís
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                <emph type="sup"/>
              43
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              , or stone from which iron
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              is melted, then crude pyrites which easily fuse are added to it, together
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              with slag. </s>
              <s>From this charge, when smelted, they make cakes; and from </s>
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