| Business | Phone |
| Eby Petrography & Consulting 2200 W Berry Ave, Littleton 80120 | (303) 738-9697 |
| Harms & Brady Geological Cnslt 2200 W Berry Ave # 5, Littleton 80120 | (303) 798-1122 |
| Lewis & Clark Exploration Co 1100 W Littleton Blvd # 101, Littleton 80120 | (303) 797-8573 |
| Mc Murray Geological Consltng 2620 W Long Cir, Littleton 80120 | (303) 798-0060 |
| North Country Exploration 5349 S Windermere St, Littleton 80120 | (303) 794-8627 |
| Society Of Economic Geologist 7811 Shaffer Pkwy, Littleton 80127 | (720) 981-7882 |