Substances obtained by mining (8)
I believe the answer is:
minerals
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">substances obtained by mining</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for minerals that I've seen before include "Stone and metal" , "Natural substances in the ground, such as coal" , "Fizzy soft drinks" , "Substances obtained by mining" , "Neither animals nor vegetables" .)