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General Uranium Ore Info Our Uranium ore is from a variety of sites throughout the USA, mined by our own prospectors. All radioactive ore is sold by radiation level, not ore type or physical size. This does not mean that you will get a sample that measures very high and is the size of a dime. All our samples are of typical 'useful size' which is in the 2" to 4" range, with most samples being about 3" across. The exception to this is our Uranium Ore Vial which contains small chips of various ores, as well as our Cloud Chamber Sources which are also intentionally small to operate in the limited space of a Cloud Chamber instrument.