Arizona · Area of Critical Environmental Concern
Swansea Historic District
BLM found a cultural value, a scenic value and a historic value here, and its plan calls for special management. BLM's records place at least 2 active mining claims (and 45 more BLM lists as Filed) and 2 rights of way inside the line today, and three grazing allotments cover part of it. It covers 5,929 acres and was designated May 10, 2007, in the Lake Havasu RMP. In the plan's name, RMP stands for resource management plan.
One of the 1,120 places the Bureau of Land Management has designated an Area of Critical Environmental Concern. This page shows its line, what BLM found there and what sits inside it.
The line
Who holds the claims
At least 47 claims sit inside this line: 2 active and 45 filed and pending, 47 with a holder BLM names. BLM lists 45 as Filed and 2 as Active.
- Koala Resources LLC27claims
- INFINITY METALS USA LLC12claims
- Infinity Metals USA LLC4claims
- GRE INC2claims
- KOALA RESOURCES LLC2claims
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
2 rights of way sit inside the line. BLM files 1 under oil & gas facilities and 1 under non-energy facilities.
- SOUTHWEST GAS CORP1right of way
- ARIZONA STATE OFFICE1right of way
Grazing allotments
3 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Planet202,686acres
- Muse144,145acres
- Primrose106,913acres
The nearest areas
- Three Rivers RiparianArizona · 10,158 acres · at least 10 active mining claims and 1 more BLM lists as Filed, 1 right of way, 4 grazing allotments covering part of it13miles
- Aubrey Peak Bighorn Sheep HabitatArizona · 2,457 acres · 2 grazing allotments covering part of it14miles
- Three Rivers RiparianArizona · 184 acres · 2 grazing allotments covering part of it19miles
- McCracken Desert Tortoise HabitatArizona · 33,225 acres · at least 13 active mining claims, 1 right of way, 3 grazing allotments covering part of it22miles
- Three Rivers RiparianArizona · 31,589 acres · at least 48 active mining claims and 5 more BLM lists as Filed or Under Review, 3 rights of way, 9 grazing allotments covering part of it25miles
More from BLM's Arizona office
Every area BLM's Arizona office holdsThe proposed rule
A proposed rule, RIN 1004-AF53, would change how BLM drafts every land use plan, and how it designates ACECs like Swansea Historic District. The comment window hasn't opened: the proposed rule wasn't in the Federal Register at our last check. The Watch sends one email the day it prints.
The rule's abstract
The purpose of this rulemaking is to establish in regulations an updated process for the approval of the development, revision, amendment, and maintenance of land use plans, as provided for by the Federal Land Policy and Management Act of 1976, for public lands administered by the Bureau of Land Management (BLM). Additionally, this rulemaking will provide clarification of the process the BLM uses for designating Areas of Critical Environmental Concern.Unified Agenda entry for RIN 1004-AF53, Publication ID 2026, reginfo.gov (OMB OIRA), read Oct 18, 2026