Im really confused by all this cause if i target the hot spots for a certain ore, i get ores more often than not. The hot spots can be found all over on various sites. When I need an ore I just go to this grade node in this area and set it to that target and mine all the ore i need. Granted im not high in mining as of yet but when i need something like iron ore i gather it by the truckload in a fairly small amount of time and get very few alumens.

So is it really a ratio issue or is it just a need to target the correct spot issue?