RE: New to this9 Sep 2020 11:40
Welcome aboard gpeppers.
I can't really recommend any specific sites, but if you follow the breadcrumbs from searching on mining within the specific mineral your companies of interest are exploring, and just keep digging into terms you find and don't understand.
It is worth looking into each mineral separately as there are huge differences in mineral grading, extraction and refining. Ferrex/Keras has seen me grow my knowledge from a start point of nothing, across Iron, Manganese, Gold and Phosphate. Every day's a school day! :-)
Enjoy and ATB!