This becomes interesting. Many gemstones are also essentially metal ores. I wonder if this will affect gem and mineral mining/collecting in El Salvador, which does have a decent reputation in the mineral/gem/lapidary circle.
Stories on El Salvador's mining ban emphasize gold mining. I'm not sure what gems are found in coincidence with gold, except maybe quartz crystals in hydrothermal gold deposits.
Silver, copper, lead, zinc and titanium seem to be the other metals mined in El Salvador. Although there are collectable minerals associated with some of these (copper->azurite, malachite; lead->galena crystals), I can't immediately think of gemstones that occur in these metallic ores.