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Arizona · Area of Critical Environmental Concern

Black Mountains Ecosystem Management

BLM found a natural system, a wildlife resource, a cultural value, a scenic value, a natural process and a historic value here, and its plan calls for special management. BLM's records place at least 1,122 active mining claims (and 263 more BLM lists as Filed or Under Review) and 40 rights of way inside the line today, and nine grazing allotments cover part of it. It covers 133,225 acres and was designated March 7, 1995, in the Kingman RMP. In the plan's name, RMP stands for resource management plan.

Acres133,225
DesignatedMar 7, 1995Kingman RMP
BLM founda natural system, a wildlife resource, a cultural value, a scenic value, a natural process and a historic valueand found it important
Inside, at least1,171claims, rights of way and allotments, and 263 more claims BLM lists as Filed or Under Review

The line

Black Mountains Ecosystem Management
Mining claim, 1,070Claimant withheld by BLM, 52Filed, 235Under Review, 24Filed, claimant withheld, 4Right of way, 40
Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. 396 marks are where BLM's own maps draw them; 1,029 claims are placed at the middle of the section or survey lot 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 1,385 claims sit inside this line: 1,122 active and 263 filed and pending, 1,324 with a holder BLM names and 56 with a claimant BLM withholds under the Privacy Act. One named holder is a private individual, and we don't print that name. BLM lists 1,122 as Active, 239 as Filed and 24 as Under Review.

  • MINAURUM CORP324claims
  • GOLD79 USA CORP324claims
  • DDS RESOURCES LLC145claims
  • ARIZONA SILVER EXPLORATION US INC.144claims
  • GOLDEN VERTEX CORP140claims

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

40 rights of way sit inside the line. BLM files 26 under non-energy facilities, 10 under other energy facilities, 2 under oil & gas facilities and 2 under fiber optic facilities.

  • MOHAVE COUNTY (Arizona) - FLOOD CONTROL DISTRICT4rights of way
  • Holder not listed by BLM3rights of way
  • CITIZENS UTILITIES RURAL CO INC3rights of way
  • MOHAVE COUNTY (Arizona)3rights of way
  • UNS ELECTRIC INC2rights of way

Grazing allotments

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

  • Big Ranch Unit B442,638acres
  • Big Ranch Unit A173,348acres
  • Black Mt Unit A80,631acres
  • Fort Macewen Unit A61,415acres
  • Fort Macewen Unit B45,103acres

The nearest areas

More from BLM's Arizona office

Every area BLM's Arizona office holds

The proposed rule

A proposed rule, RIN 1004-AF53, would change how BLM drafts every land use plan, and how it designates ACECs like Black Mountains Ecosystem Management. 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

Watch the ruleWhere the rule stands