Asteroidal resources are unique and diverse. In general, they are different from the dirt beneath our feet and the ores that we mine from our planet's crust. Likewise, they are much different than the Moon, Mars, and other planets' crusts. Asteroids are much more metal-rich, like the core of the Earth, Moon, Mars and any other planet, and unlike their crusts. The asteroids are normally not as enriched in oxides, silicates, and the other lighterweight elements that floated up to dominate a planetary crust.
Many asteroids are like a mixture of a planetary metal core plus a crust plus the mantle in between.
Some are entirely like a core or a mantle or a crust, having come from a large parent body which was broken up. In most asteroids, free metal is abundant in the mix, and often dominant. This free metal can be used without any further industrial processing. This is because these metals on Earth are mostly in the inaccessible core, being that they don't readily bind with oxygen or silicon and float to the crust during planet formation. However, let s consider what will probably be a common kind of asteroid for the following brief analysis.