1mentioned proprietors buy it in with the copper; if there be no silver,
copper
is made direct. If such copper ore contains some minerals which do not
easily melt, as pyrites or cadmía metallíca fossilís43, or stone from which iron
is melted, then crude pyrites which easily fuse are added to it, together
with slag. From this charge, when smelted, they make cakes; and from
is made direct. If such copper ore contains some minerals which do not
easily melt, as pyrites or cadmía metallíca fossilís43, or stone from which iron
is melted, then crude pyrites which easily fuse are added to it, together
with slag. From this charge, when smelted, they make cakes; and from