El Teniente mine is reportedly the largest underground copper mine in the world with some 3000km of tunnels and 1500km.
The mine started in the the 1820s and named from Braden mine from 1904 until it was changed to El Teniente mine in 1973.
The link below takes you to a really interesting article/photographic tour of the mine, there are also specimen links to our database - where currently we have minerals noted as being from the Braden mine - so pre 1973.
On the locality page you will see that both the old and new locality are linked, so that the specimens remain correctly located but with reference to the time/mine name when they were collected.
