Reverse circulation drilling rig rely on air reverse circulation to collect rock cuttings, widely used in mineral prospecting, soil sampling and open-pit mine exploration. They are sorted by chassis, drive, power and working depth. In terms of mobility: Portable split RC rigs are light for mountain small-area sampling. Skid-mounted types stay stable on flat open mines. Crawler RC rigs own excellent cross-country performance for muddy, sloped terrains. Truck-mounted versions transfer quickly along roads for large-scale regional surveys. By driving mode: Mechanical RC rigs feature low costs for shallow holes. Full hydraulic top-drive rigs provide steady high torque, ideal for medium-deep hard rock drilling. Power options cover diesel engines for remote wild zones without power grids and explosion-proof pneumatic rigs for underground mining with flammable gas. Technically, a high-performance reverse circulation drilling rig adopts dual-wall drill pipes for fast cuttings collection. Multi-stage impact RC rigs enhance penetration speed in dense hard formations. By depth grade: Light rigs drill within 100m, medium rigs reach 100–300m for general mineral reconnaissance, and heavy-duty reverse circulation drilling rigs support over 300m deep open-pit exploration.