Rock gold is an ore embedded in hard rock in the form of fine grains, tiny particles or refinements, usually found in veins, gangue, and sulfide minerals. The adhesion of gold particles to rocks is very strong and usually requires more complex extraction methods, including a combination of chemical and physical methods such as crushing, grinding, cyanide leaching, oxide ore leaching, carbon leaching, etc. This is because the gold particles in rock gold are typically smaller and require multiple processing steps to extract fully.