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"In my mind I have gone all over the universe, which may make it less important for me to make piddling little trips... I did enjoy seeing Stonehenge. It looked exactly the way I thought it would look."
- Isaac Asimov

Spectro-Flash Analysis  
  Device for determining the content of meteorites.  

Leave it to Jack Williamson to elaborate on the life of asteroid miners.

His welding arc dangled at his belt, the electrode still glowing red. He had just finished securing to this slowly-accumulated mass of iron his most recent find, a meteorite the size of his head.[1]

Five perilous weeks he had labored, to collect this rugged lump of metal—a jagged mass, some ten feet in diameter, composed of hundreds of fragments, that he had captured and welded together. His luck had not been good. His findings had been heart-breakingly small; the spectro-flash analysis had revealed that the content of the precious metals was disappointingly minute.

[Footnote 1: The meteor or asteroid belt, between the orbits of Mars and Jupiter, is "mined" by such adventurers as Thad Allen for the platinum, iridium and osmium that all meteoric irons contain in small quantities. The meteor swarms are supposed by some astronomers to be fragments of a disrupted planet, which, according to Bode's Law, should occupy this space.]

From Salvage in Space, by Jack Williamson.
Published by Astounding Stories in 1933
Additional resources -

Compare to the process by which Impactor Determines Composition from The Mechanical Monarch (1958) by E.C. Tubb.

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