The production process covers the underground mining of run-of-mine tin ore using adit-and-ramp access. The main inputs include geological resource information, underground development and mining equipment, power, and ground-support materials, and the output is run-of-mine tin ore extracted underground. The main process units or stages, in sequence, are detailed geological investigation and feasibility studies, construction of the underground access and development system, preparation and cutting of mining blocks, stoping and ore breaking, ore loading and underground haulage, shaft hoisting, and temporary surface storage.