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Abandoned mines › Washington
Abandoned mine inventory

Abandoned mines in San Juan County, Washington

San Juan County, Washington has 46 mine and prospect features on USGS topographic maps published 1943–1998, including 1 prospect pits. MSHA's register carries 15 mines in the county with status Abandoned or Abandoned and Sealed.

Every mine and prospect feature the USGS digitized from historical topographic maps covering San Juan County, every OSMRE abandoned mine land problem in the county, and every MSHA-registered mine here with status Abandoned. Named features are listed below; unnamed ones are counted by type. Locations are deliberately not shown: this page says what abandoned workings are in the county, not where to find them. They are dangerous and should not be entered.

Mapped mine features (USGS)
46
Mine openings
0
OSMRE problems unreclaimed
0
MSHA mines marked abandoned
15
0 features carry a name1 prospect pits10 quadrangle maps, published 1943–1998 0 MSHA mines abandoned and sealed
What the features are
  1. Prospect pits and trenches
    shallow exploration diggings that never became a mine
    1 2.2%
  2. Mines and surface workings
    labelled mines, open pits, strip mines, placer and hydraulic workings
    1 2.2%
  3. Quarries, gravel and borrow pits
    construction-material and industrial-mineral extraction
    44 95.7%
MSHA-registered mines with status Abandoned15 on register
  1. Friday Harbor Pit & Mill
    Surface metal/non-metal · Sumas Transport Inc · MSHA ID 4502653
    Abandoned
  2. FRIDAY HARBOR PIT & MILL
    Surface metal/non-metal · Friday Harbor Sand & Gravel · MSHA ID 4500626
    Abandoned
  3. Friday Harbor Pit & Mill #3
    Surface metal/non-metal · B C Sand & Gravel · MSHA ID 4502775
    Abandoned
  4. Jensen Pit
    Surface metal/non-metal · San Juan County Road Department · MSHA ID 4500529
    Abandoned
  5. Langdon Quarry
    Surface metal/non-metal · Orcas Excavators · MSHA ID 4502904
    Abandoned
  6. Lopez Ready Mix Pit & Plant
    Surface metal/non-metal · Lopez Ready Mix · MSHA ID 4502404
    Abandoned
  7. Lopez Sand & Gravel Pit
    Surface metal/non-metal · Lopez Sand & Gravel · MSHA ID 4502403
    Abandoned
  8. Mountain Crest Quarry
    Surface metal/non-metal · Mountain Crest Quarry · MSHA ID 4503568
    Abandoned
  9. Portable Crusher
    Surface metal/non-metal · J & R Crushing · MSHA ID 4503227
    Abandoned
  10. PORTABLE CRUSHER #1
    Surface metal/non-metal · Island Concrete Products · MSHA ID 4503386
    Abandoned
  11. Red Cross Quarry & Mill
    Surface metal/non-metal · Clauson Quarry LLC · MSHA ID 4500017
    Abandoned
  12. Screening Plant #1
    Surface metal/non-metal · San Juan County Public Works · MSHA ID 4503471
    Abandoned
  13. Sea Island Pit & Screening
    Surface metal/non-metal · Sea Island Corp · MSHA ID 4501315
    Abandoned
  14. Shoal Bay Pit No 2
    Surface metal/non-metal · San Juan County Road Department · MSHA ID 4502405
    Abandoned
  15. Windsock Pit
    Surface metal/non-metal · Windsock Farms & Excavations · MSHA ID 4503001
    Abandoned

Status and date are as reported to MSHA by the operator. Each mine's own page carries its accident, citation and inspection record.

By source vocabularythe publishers' own terms
Feature type Features
Quarry 20
Gravel Pit 18
Borrow Pit 3
Sand Pit 2
Gravel Pit 1
Open Pit Mine or Quarry 1
Prospect Pit 1
Other counties in WashingtonAll counties →
How to read these numbers

A USGS feature is a symbol on a historical topographic map, there when the map was surveyed; it may since have been sealed, reclaimed, built over or reopened as a working mine, and the map does not say which. An OSMRE row is a problem the abandoned mine land program tracks, not a mine. An MSHA mine is a registered operation whose operator reported abandonment, a record that starts in the 1970s. The three overlap and are never added together. The county is assigned from each feature's coordinates against the Census 2023 county boundaries. The full method is on the national page.

Sources
  1. USGS, Consolidated Prospect- and Mine-Related Features from 7.5- and 15-Minute Topographic Quadrangle Maps of the United States (USMIN)
    597,612 point and area features digitized from about 106,350 historical topographic maps published 1886–2006; public domain (CC0). A feature is a map symbol, not a field-verified site, and the map does not say whether it was still worked.
  2. USGS Fact Sheet 2025–3003, The Abandoned Mine Inventory of the United States
    States that as of 2025 there is no comprehensive national inventory of abandoned mine features, and that the detailed national database now being built will not be published.
  3. OSMRE, Abandoned Mine Land Inventory System (e-AMLIS), public Problems layer
    One row per abandoned mine land problem in a problem area, with its type, funding program and reclamation status; mostly coal mined before the 1977 Surface Mining Control and Reclamation Act. Coordinates are the problem area's.
  4. MSHA, Mines dataset (Mine Data Retrieval System)
    Every mine registered with MSHA since the 1970s; a mine reads Abandoned or Abandoned and Sealed when its operator reported that status. Refreshed weekly.
  5. US Census Bureau, 2023 cartographic county boundaries (1:500,000)
    Each feature's county is assigned by its coordinates against these boundaries, not copied from the source file.
  6. GAO-20-238, Abandoned Hardrock Mines (March 2020)
    Federal agencies had identified at least 140,000 abandoned hardrock mine features on federal land and estimated more than 390,000 more not yet captured in their databases.
  7. Abandoned Hardrock Mine Reclamation (AHMR) Program, US Department of the Interior
    The program the USGS inventory is compiled for. Its appropriations and the 674,000 field-confirmed feature count on this page were provided by the program manager, Office of Environmental Policy and Compliance, and are cited with permission (2026-09-08).
  8. IMCC-NAAMLP Hardrock AML Report
    Page 48 carries the two figures this page leans on: USGS estimates 633,181 of the 725,690 mine features it recorded from historic topographic maps, 87 percent, are hardrock; and state and federal agencies have submitted more than 724,000 AML features to the national database being built, already more than the historic maps hold. Year-by-year AHMR funding is on page 35.