Colorado · Area of Critical Environmental Concern

San Luis Hills ACEC

BLM found a natural system and a wildlife resource here, and its plan calls for special management. BLM's records place at least 3 active mining claims (and 79 more BLM lists as Filed) and 4 rights of way inside the line today, and nine grazing allotments cover part of it. It covers 36,472 acres and was designated December 18, 1991, in the 1997 San Luis RMP. In the plan's name, RMP stands for resource management plan. The plan's name carries a later year than that date: BLM's map gives the date it records for the area, and a plan approved later can carry forward an area designated earlier.

The line

Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. 83 marks are where BLM's own maps draw them; 3 claims are placed at the middle of the section their land description names, not at the stakes on the ground. Hover or tap one for its holder. The 9 grazing allotments below aren't marked.

Who holds the claims

At least 82 claims sit inside this line: 3 active and 79 filed and pending, 79 with a holder BLM names and 3 with a claimant BLM withholds under the Privacy Act. BLM lists 79 as Filed and 3 as Active.

• ALMADEX AMERICA INC79claims
• Names withheld by BLM (private individuals)3claims

BLM's mining rules list designated ACECs among the places where mining that disturbs the surface beyond casual use needs a plan of operations BLM approves. Exploration of five acres or less can go ahead on a notice instead.

The rights of way

4 rights of way sit inside the line. BLM files 3 under non-energy facilities and 1 under fiber optic facilities.

• CO DEPT OF TRANS2rights of way
• CENTURYTEL OF EAGLE INC D/B/A CENTURY LINK1right of way
• CENTURYTEL OF EAGLE1right of way

Grazing allotments

9 grazing allotments cover part of this line. Their permittees aren't named here yet.

• Pinon Hills14,279acres
• Pinon10,713acres
• Eight Mile7,098acres
• La Sauses6,255acres
• Flat Top6,102acres

The nearest areas

• Rio Grande River Corridor ACECColorado · 5,357 acres · at least 1 mining claim BLM lists as Filed, 1 right of way, 6 grazing allotments covering part of it7miles
• Cumbres and Toltec Scenic Railroad Corridor ACECColorado · 3,904 acres · 4 grazing allotments covering part of it18miles
• Los Mogotes ACECColorado · 33,447 acres · 2 rights of way, 10 grazing allotments covering part of it20miles
• Ra Jadero Canyon ACECColorado · 3,652 acres · 3 grazing allotments covering part of it24miles
• Taos PlateauNew Mexico · 288,234 acres · at least 6 active mining claims, 26 rights of way, 74 grazing allotments covering part of it31miles

More from BLM's Colorado office

Every area BLM's Colorado office holds