Oh yeah, my Corrosive build here is really the one I feel most comfortable with - the results have been very consistent with it- World "Builds" thread 
It is pretty safe bet you’ll get around 200k amethyst and 100k emerald with some pretty good hotspots - what I do with this build is mine right along the edge of the amethyst/emerald hotspot area. It is the most profitable mining I’ve found as you get so much else besides the gems. 
But, on this build, if you really didn’t want the emerald, you might be best off taking out Ocean, keeping the water much more shallow and likely giving you much larger amethyst spots.