Just like apple is a trademark, is a bunch of bullcrap if you ask me, because they are dictionary words, what is next ? I can't buy apples at the grocery store because they have a trademark on it ? Stupid laws...
One approach may be to use the USPTO's Trademark Electronic Search System (TESS) to do a 'Basic Word Mark' search on the word "gold"...
http://tess2.uspto.gov/
Looking at all the listings, focusing on the 'Good and Services' sections.
An example from TESS in which the use of the word "gold" is associated with the following:
Goods and Services: IC B . US B . G & S: Design, construction and operation of buildings or real estate projects that promote occupant health and wellness