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.
To the extent that gem finds are incident to bulk metal mining operations, it could decrease gem yield. But I'm not sure what the gems would be.
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.
Rose quartz is a primary ore of Titanium. Asterated rose quartz comes from this area. If you have gold you likely have other heavy metals like iron in the area, which can lead to garnets. The calcium content in the area lends itself to making Epidote. Sphalerite is the primary ore of Zinc and also produces quite impressive gems. Then you'll have volcanic gem rock in the area, such as multi-colored obsidian.
