It is the nature of truth in general, as of some ores in particular, to be richest when most superficial. Edgar Allan Poe
There are only two ores of tin: the peroxide, tin-stone, or Cassiterite; and tin pyrites, sulphide of tin, or Stannine: the former of which alone has been found in sufficient abundance for metallurgical purposes. Andrew Ure
U 235 has - I'm stating fact, not theory - been separated in quantity easily sufficient for preliminary atomic power research, and the like. They got it out of regular uranium ores by new atomic isotope separation methods; they have quantities measured in pounds... John W. Campbell
A 16th century book by Georg Agricola called De re metallica describes the highly developed and complex processes of mining metal ores, metal extraction and metallurgy of the time. Source: Internet
Actinium-227 (half-life 21.77 years) occurs in all uranium ores, but in small quantities. Source: Internet
Aluminum ores, bars, wire and foil and aerosol containers are also among the dozens of items on that proposed list that is set to be finalized this coming week. Source: Internet