Ball mill reduces material size using rotating cylinder with steel or ceramic balls. Available in capacities from 1.1 to 615 t/h. Three main models: Ф900×3000, Ф2700×4500, and Ф5500×8500
Cementing units transport dry cement pneumatically to wellsite. Storage tanks can be atmospheric (3 psi) or pressurized (44 psi). Displacement tanks measure and mix water for cement slurry. Liquid additives can be mixed manually or automatically. Surge tanks smooth cement flow in long lines
Diamonds are made of carbon atoms under extreme heat and pressure. Most diamonds form deep within Earth's mantle between 140-800 kilometers. Diamonds contain small amounts of salt, possibly from seawater
Nauru is a 21 km² island in Micronesia, 300 km east of Kiribati. Settled by Micronesians 3,000 years ago, with 12 traditional clans. Became German colony in 1888, then Australian-controlled after WWII. Gained independence in 1968, now a republic with parliamentary system
British studio Geometa developed simulation game released in 2018. Players manage coastguard rescue service in randomly generated open world. Game features vehicles from airplanes to trains built on voxel-based system
Mining access occurs via declines, vertical shafts, or adits. Declines are spiral tunnels around deposits, requiring safety culverts. Shafts are vertical excavations for economical haulage. Adits are horizontal excavations into hillsides