4 ms·
Was that book perhaps referring to copper ore? Even low grade iron ores like taconite contain a double digit percentage of iron: https://en.wikipedia.org/wiki/
by philipkglass 5y ago
Was that book perhaps referring to copper ore? Even low grade iron ores like taconite contain a double digit percentage of iron:
https://en.wikipedia.org/wiki/Taconite https://en.wikipedia.org/wiki/Taconite