Anywhere with a decent population of golems in the mid-70s would be the ideal place. I'm sure there are more, but the ones that come to mind would be Katta Castrum (TBS era) and SoD era Temple of Bertoxxulous.
Magelo and ZAM both have lists of creatures that drop the items along with their zone locations that you can take a look at. Magelo Alkalai Loam Titanium Ore ZAM Alkalai Loam Titanium Ore