Abandoned mines in Mariposa County, California

1. Mine openings

   shafts, adits, air shafts, portals and vertical openings: the ways into underground workings
   352 32.6%
2. Prospect pits and trenches

   shallow exploration diggings that never became a mine
   547 50.7%
3. Mines and surface workings

   labelled mines, open pits, strip mines, placer and hydraulic workings
   50 4.6%
4. Quarries, gravel and borrow pits

   construction-material and industrial-mineral extraction
   22 2.0%
5. Dumps, tailings, spoil and gob

   what mining left above ground
   108 10.0%

A name is the label printed beside the symbol on the map. "First mapped" is the earliest topographic edition that shows the symbol, which bounds the feature's age from above; it is not the date it was worked. Unnamed features (most prospect pits, adits and shafts carry no label) are in the counts above but not this list.

1. Artru

   Underground metal/non-metal · Fred Silva Enterprises · MSHA ID 0404888
   Abandoned 1988-03-30
2. Bear Creek Quarry

   Surface metal/non-metal · Mariposa Decco Rock, Inc · MSHA ID 0405474
   Abandoned 2010-08-06
3. Bondurant

   Underground metal/non-metal · Grant Exploration Ltd · MSHA ID 0404491
   Abandoned 1981-09-15
4. Colorado Quartz

   Underground metal/non-metal · Colorado Quartz Gold Corp · MSHA ID 0403828
   Abandoned 2023-03-20
5. Diltz Mine

   Underground metal/non-metal · Lobo Mining Corp · MSHA ID 0404069
   Abandoned 1995-10-12
6. Goods Gulch Mine

   Underground metal/non-metal · Goods Gulch Mining Company · MSHA ID 0404089
   Abandoned 1979-01-12
7. Grizzly Quarry

   Surface metal/non-metal · Eagle Rock Inc · MSHA ID 0404450
   Abandoned 1981-05-12
8. Hasloe

   Underground metal/non-metal · Gentry Gulch Mining Inc · MSHA ID 0404813
   Abandoned 1990-05-08
9. Horseshoe

   Underground metal/non-metal · Western States Mining Company Inc · MSHA ID 0404620
   Abandoned 1984-05-15
10. IRON SPRINGS CONSOLIDATED

    Surface metal/non-metal · Mark Long Tractor Work · MSHA ID 0405381
    Abandoned 2025-03-26
11. MARIPOSA AGGREGATES QUARRY

    Surface metal/non-metal · Mariposa Aggregates · MSHA ID 0404785
    Abandoned 2001-04-12
12. Mariposa Sand & Gravel Pit & Mill

    Surface metal/non-metal · Mariposa Sand & Gravel · MSHA ID 0401850
    Abandoned 1989-05-01
13. Mockingbird Mine

    Underground metal/non-metal · Par Mining & Exploration · MSHA ID 0404757
    Abandoned 1987-04-20
14. Mockingbird Mine

    Underground metal/non-metal · Emmett's Excavation Inc · MSHA ID 0405781
    Abandoned 2020-05-20
15. Nellie Kahoe Mine

    Underground metal/non-metal · Texas Hill Mines Company · MSHA ID 0404378
    Abandoned 1986-03-11
16. NMP Mariposa Operation

    Surface metal/non-metal · Noble Metals Processing LLC · MSHA ID 0405686
    Abandoned 2007-10-04
17. Penon Blanco Mine

    Underground metal/non-metal · Western States Mining Company Inc · MSHA ID 0404436
    Abandoned 1981-04-17
18. Penon Blanco Mine

    Surface metal/non-metal · Penon Blanco Mineral Resources · MSHA ID 0405566
    Abandoned 2005-02-16
19. Pine Tree-Josephine

    Underground metal/non-metal · Fremont Gold Mining LLC · MSHA ID 0404793
    Abandoned 1988-04-12
20. Princeton Lands

    Underground metal/non-metal · Western States Mining Company Inc · MSHA ID 0404527
    Abandoned 1982-05-26
21. Quail Mine

    Facility metal/non-metal · Southwind Texas Mining Corp · MSHA ID 0404605
    Abandoned 1982-09-14
22. Red Cloud

    Underground metal/non-metal · G F Phipps Partnership · MSHA ID 0405050
    Abandoned 1989-09-19
23. Red Cloud Mine

    Surface metal/non-metal · Aurum Technologies Inc · MSHA ID 0404771
    Abandoned 1989-05-22
24. Squantum Mine

    Underground metal/non-metal · Mono Camp Company · MSHA ID 0404397
    Abandoned 1981-05-08
25. Virginia-Belmont Mine

    Underground metal/non-metal · Claro Management · MSHA ID 0404497
    Abandoned 1981-06-17
26. WILLIAM BROS MINE

    Underground metal/non-metal · A T & E Enterprises Inc · MSHA ID 0405146
    Abandoned 1997-05-13
27. Yosemite Slate Quarry

    Surface metal/non-metal · Mariposa County Department Of Public Works · MSHA ID 0405136
    Abandoned 1991-08-19

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

• San Bernardino County 14,976
• Inyo County 11,475
• Kern County 4,879
• Riverside County 3,227
• Mono County 2,946
• Siskiyou County 2,362
• Imperial County 1,232
• Tuolumne County 948
• San Diego County 901
• Calaveras County 840
• Shasta County 832
• Trinity County 685

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.