Arizona · Area of Critical Environmental Concern
White-Margined Penstemon Reserve
BLM found a natural system, a wildlife resource and a natural process here, and its plan calls for special management. BLM's records place at least 92 active mining claims (and 11 more BLM lists as Filed) and 7 rights of way inside the line today, and three grazing allotments cover part of it. It covers 35,597 acres and was designated March 7, 1995, in the Kingman 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 103 claims sit inside this line: 92 active and 11 filed and pending, 103 with a holder BLM names. BLM lists 92 as Active and 11 as Filed.
- ANTLER OPERATIONS INC92claims
- Peaceful Valley Metals LLC11claims
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
7 rights of way sit inside the line. BLM files 6 under non-energy facilities and 1 under other energy facilities.
- MOHAVE COUNTY (Arizona)3rights of way
- Holder not listed by BLM2rights of way
- CITIZENS UTILITIES RURAL CO INC1right of way
- UNISOURCE ENERGY CORP1right of way
Grazing allotments
3 grazing allotments cover part of this line. Their permittees aren't named here yet.
- La Cienega169,537acres
- Happy Jack Wash40,384acres
- Boriana Unit A39,821acres
The nearest areas
- Hualapai Mountain Research Natural AreaArizona · 4,492 acres · at least 9 mining claims BLM lists as Filed, 1 right of way, 4 grazing allotments covering part of it13miles
- Crossman Peak ScenicArizona · 48,870 acres · at least 4 active mining claims and 5 more BLM lists as Filed, 16 rights of way, 4 grazing allotments covering part of it22miles
- Carrow-Stephens RanchesArizona · 499 acres · 2 rights of way, a grazing allotment covering part of it22miles
- McCracken Desert Tortoise HabitatArizona · 33,225 acres · at least 13 active mining claims, 1 right of way, 3 grazing allotments covering part of it25miles
- Beale Slough Riparian & CulturalArizona · 2,206 acres · 3 rights of way30miles
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 White-Margined Penstemon Reserve. 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