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===Meaning===
A '''high grade ore''' is an [[ore]] which contains a large [[percentage]] of a desired [[mineral]] by [[mass]].
===References===
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''High-grade ores, page 212, Gateway GCSE Chemistry, Oxford, OCR '']