Stumbled upon this Geology book.
https://pubs.usgs.gov/pp/pp1707/pp1707.pdf
Further hunting revealed this video -> https://www.youtube.com/watch?v=UJ7Qc3bsxjI
Interesting book for people living in NW USA/Canada
Moderator: Global Moderator
Interesting book for people living in NW USA/Canada
Aussie GoldSmithPP - 25% PMGOLD, 75% VDCO