There's an enormous amount of uncertainty, it seems, as to the number of asteroids which may be of the metallic iron-nickel variety which is presumably the main type worth mining.
A pro space mining source also claims this in the article, and count me as surprised:
"We have only discovered 1% of the asteroids in the Solar System - and we are discovering them at a larger and larger rate. We discover two or three asteroids a day. If we get from 1% to 10%, then the 650,000 asteroids we have discovered jumps to 6.5 million."
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