This would be a really cool mechanic. I hope they thought of it, and if not, that they patch something like that in. It would be neat for non-strategic resources to add a little more to an empire.
I agree. In this concept also Amber (Luxury/Science) would fit perfectly, imo.
New Luxury Resource:
Amber
See also: http://en.wikipedia.org/wiki/Amber_Road
Yields: +2 Gold, After the discovery of Biology every Amber tile also gives +1 Science.
Improved by: Mine
Terrains Found On: Found on tiles adjacent to ocean.
Historical Info: "Amber is fossilized tree resin (not sap), which has been appreciated for its color and natural beauty since Neolithic times. Amber is used as an ingredient in perfumes, as a healing agent in folk medicine, and as jewelry. There are five classes of amber, defined on the basis of their chemical constituents. Because it originates as a soft, sticky tree resin, amber sometimes contains animal and plant material as inclusions. Amber occurring in coal seams is also called resinite, and the term ambrite is applied to that found specifically within New Zealand coal seams.
Amber was an important medium of exchange in the Stone Age. In some Central European countries it is customary for children to buy a teething amber beads. Amber reduce the old legend of the teething pains. In 2007, the Harvard researcher Santiago Ramirez a team of researchers discovered the waters of the Dominican Republic amber, which was the remnants of 15-20 million years ago to orchids. Discovery gave the researchers a new understanding about orchid history."