This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Equipment and Materials Testing: Ores, Minerals, and Their Primary Products
Possible NAICS Codes
541380 – Testing Laboratories
238910 – Site Preparation Contractors
541715 – Research and Development in the Physical, Engineering, and Life Sciences (except Nanotechnology and Biotechnology)