Found the article.
What follows is a breakdown version of an article written by L. S. de Camp reguarding the tech found in the orginal Howard Conan stories. The article was first published in 1963.
All the material, tech and idems were found in the orginal stories by REH. Any lines in italics are my own addition to the article.
The following list is the known natural metals that were worked on a regular basis; Gold, Silver, Copper, Lead, Iron. Tin can be implied by the use of Bronze. While Mercury is never mentioned in the orginal stories, it may be implied by the use of mirrors
and alchemy experements.
Textiles and clothing are rarely given great descriptions in the stories. However the following are known materials mentioned; Silk in the form of velvet satin, leather.
It is also highly likely that wool and linen were also in use as these materials would not conflict with the known progression of weaving and cloth making.
Base chemistry is implied by the presence of Beer, Ale, Wine, Sugar, Mummification and Acids.
Architecture and building materials comes in many forms during the Hyborian Age. Mention is made of both the arch and dome. Due to the amount of space these forms cover it is possible to imply that these are the true forms of Arch and Dome. The Pyramid is used in Stygia. These, however, seem to be used not only as tombs but also as functional temples. The presence of fountains would also seem to imply the use of aquaducts.
Materials used in the construction of buildings run the entire range of known classical materials from Wood through Marble also, Jade and Jet can be found. Again, it is not beyond possiblity to extract a few additional materials such as, Granite, Limestone, Mud Brick. In this case any classical material can be used with little fear of exceeding beliveibility.
Due to time constraints I will need to finish this tomarrow.[/i]