From http://cashandtreasures.wikifoundry.com/page/New+Mexico : "226 acres of private lands with lots of interesting rocks and gemstones right on the property. Minerals found are white and pink chalcedony, chalcedony roses, red, brown and yellow jasper, jasper breccia, picture jasper, banded agate, zeolites, geodes, massive hematite, banded rhyolite, andesite, volcanic bombs, scoria, limonite and hematite-banded welded tuff, and lots of really nice colorful rocks!

Handy to bring along:
1. Collecting bag
2. Rock hammer
3. Hand tools

Helpful notes to newcomers:
Grant County, with its county seat in Silver City, lies at the heart of this vast mineralized area and is New Mexico’s richest mineral producing county"

Some good info is on their website: "https://www.casitasdegila.com/rockhounding.html"