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Where are you getting these figures from? The spawn points for iron are static; it's easy if you know where to go.
I got those figures from running around farming Tin. I was leveling BS on an alt, and needed Bronze :) I got more copper and tin than I did iron. Rough estimate from multiple loops were:
86 Copper
62 Tin
44 Iron
12 Silver
8 Gold
I have no idea where the static spawn points are, so I can't speak to that. However, the Iron did seem to mostly come from around the Shimmering Flats area. Then, when I went deeper into the "Needles" area, Tin & Copper took over in force. A few Iron nodes, but mostly Tin & Copper. So if you focus around Shimmering Flats, then you can probably do ok.
Personally, I think Arathi is better if you want to focus purely on Iron. I would guestimate about 70-80% of the nodes being Iron when you run around the entire zone. In one loop, I can usually get about 3 stacks.
But - to each there own. You can get ore from many places.