Newcomer / Intro Mining problem

Ok, so I have always loved mining but something is wrong as I have destroyed an asteroid with a core component, super cool watching it, but the surface deposits within core can not be blown off even at point blank. ( Abrasion Blaster is only a category 1)
Is this a lack of power with blaster or maybe a glitch with asteroid?

Thank you for any comments on this subject.
o7 Commanders....
 
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