I'm an engineer by trade (Texas PE License 89463, Texas PE Firm 16789), but have been flying UAVs for more than 35 years, starting with electric powered sailplanes in the 1980s to DJI's Phantom 4 RTK recently. I have extensive experience with Mine sites providing site photomosaics, 3d models, topographic maps, and extensive fly through videos. I am MSHA certified miner (Part 46) and my company carries $1 million in general liability insurance. Give me a call or drop me an email if you would like to know more or want to see videos/examples of work. We have a P4RTK for precision work and can provide orthos, topos, or models to survey grade accuracy (+/- 1cm XY, +/- 3cm Z).