is a tinrich solder – an alloy of at least 95 per cent tin plus a little silver and copper. Nearly half of all mined tin is turned into solder for the electronics industry. What’s in my phone? Û A miner displays rocks containing tin he’s found. Almost half of all tin mined is turned into solder for the electronics industry.
Petroleum occurs at a depth ranging from a few hundred meters to about 23 kilometers. So, its mining is very expensive process. The possible locations are first identified by aerial surveys and ground tests (this is called oil exploration).