Reverse Circulation (RC) Drilling Rig: is a widely used technique and quick drilling method used in mineral exploration and method of testing the size, grade, and geology of mineral deposits before mining starts, where compressed air is used to push rock cuttings through the inner tubes of drill rods to the surface. This allows for the collection of fine rock samples for analysis and providing geological information at regular intervals . RC Rig Functions: Drilling: Dual-tube drill rods (inner and outer) are pushed into the ground. Air Delivery: Compressed air is pumped down through the space between the tubes. Cuttings Ejection: Compressed air rises, carrying rock cuttings (from drilling) through the inner tube of the drill rods. Sample Collection: Rock cuttings are separated from the air via a cyclone system, and samples are collected for analysis. RC Rig Components: Dual-tube drill rods: These are the tubes that descend into the drilling rig. Drill Hammer: This is the tool that breaks up the rock. Drill bit : Typically made from hardened steel or tungsten carbide, designed to crush and break rock. Air Pump: Provides the compressed air needed to propel the rock cuttings. Cyclone System: Separates the rock cuttings from the air. The importance of reverse circulation drilling (RC rig): Sample extraction: Fine samples of rock can be extracted for analysis. Mineral locating: Samples can be used to locate minerals such as gold and other metals. Deep penetration: can reach significant depths, enhancing exploration capabilities. Reverse circulation drilling: Air is sent through the space between the tubes and forces rock pieces through the inner tube. The most important informations we should collect while working on the rigs are : - quick description of ( lithology, alteration, associated minerals appearance ). - starts and ends of our expected mineralised zones approximately. - split and prepare samples and its weight . - Resource Assessment : Aids in quantifying mineral resources estimation. - faster drilling rates: general quicker than diamond drilling, making it cost-effective for exploration. Note : The drilling rate different by the rock unites and its hardness. In short, an RC rig is an effective tool in mineral exploration, as it allows accurate rock samples to be extracted and analyzed and faster and more economical and less cost than other drilling methods .