Petaca

Petaca is a real, well-documented historic mining district in Rio Arriba County, New Mexico, inside Carson National Forest, roughly between the communities of La Madera, Petaca, and Vallecitos [1]. Muscovite mica may have first been recovered here as early as the 17th century, making it possibly the earliest systematic sheet-mica recovery site in what's now the United States [1]. The district's real production era ran from about 1870 through the end of World War II, and perhaps as late as the 1960s, yielding an estimated 250,000 pounds of sheet, scrap, and punch mica from granitic pegmatites, along with smaller amounts of beryl, monazite, columbite-tantalite, and rare-earth minerals [1]. That last detail matters for today: mining claims have recently been staked on some of these pegmatites, driven by renewed demand for rare-earth elements [1] — so this is a district where you need to check current claim status, not assume open collecting.

The Petaca district sits at 6,400–8,400 feet elevation in rugged, forested Carson National Forest terrain, accessed via unpaved roads between the communities of La Madera, Petaca, and Vallecitos [1]. High-clearance vehicle recommended; UNVERIFIED exact seasonal road conditions.

General-area inference: this is old pegmatite-dump and outcrop collecting around historic mica workings — hand tools, watching for pink feldspar and quartz alongside mica books. Because active mining claims exist on some pegmatites in this district [1], confirm you're not on claimed ground before collecting.

Petaca district land sits within Carson National Forest. The Forest Service allows personal-use rockhounding on National Forest System land where mineral rights aren't privately/claim-held, collecting isn't otherwise prohibited, and only small hand tools are used — see the Forest Service's national rockhounding guide [2]. Given recently staked claims on some Petaca pegmatites for rare-earth potential [1], permission-required is the honest framing here: check current claim status with the Carson National Forest office before you dig anywhere in this district.