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state_abbr
stringlengths
2
2
state_name
stringlengths
4
10
county
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3
26
county_fips
null
active_count
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35.8k
filed_count
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10.8k
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47.6k
lode_count
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0
0
placer_count
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0
0
centroid_lat
float64
31.7
65.2
centroid_lng
float64
-161.31
-105.27
refreshed_at
stringclasses
1 value
dataset_version
timestamp[s]date
2026-07-19 00:00:00
2026-07-19 00:00:00
AK
Alaska
Bristol Bay/Western Alaska
null
252
0
252
0
0
59.42467
-161.30568
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AK
Alaska
Interior Alaska
null
839
0
839
0
0
65.2275
-146.60268
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AK
Alaska
Southcentral Alaska
null
644
1
645
0
0
60.867847
-148.9823
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AK
Alaska
Southeast Alaska
null
4,102
202
4,304
0
0
56.947533
-133.5677
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AZ
Arizona
Maricopa
null
5,001
224
5,236
0
0
33.282837
-111.15802
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AZ
Arizona
Mohave
null
3,250
493
3,777
0
0
35.702293
-114.200935
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AZ
Arizona
Pima
null
8,291
935
9,277
0
0
31.730305
-110.85534
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
AZ
Arizona
Yavapai
null
13,483
3,218
17,003
0
0
34.319252
-112.90749
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CA
California
Calaveras
null
48
74
122
0
0
38.37182
-120.62012
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CA
California
El Dorado
null
59
144
208
0
0
38.728592
-120.53769
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CA
California
Nevada County
null
534
869
1,428
0
0
39.291847
-120.80701
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CA
California
Tuolumne
null
144
257
407
0
0
38.058678
-120.27145
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CO
Colorado
Clear Creek
null
332
21
353
0
0
39.774086
-105.748055
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CO
Colorado
Gilpin
null
28
107
135
0
0
39.970222
-105.56252
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CO
Colorado
Summit
null
433
46
482
0
0
39.42811
-105.99683
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
CO
Colorado
Teller
null
340
60
407
0
0
38.95457
-105.27072
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
ID
Idaho
Boise
null
1,048
1,233
2,295
0
0
43.937046
-115.66524
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
ID
Idaho
Idaho
null
1,352
907
2,266
0
0
45.772884
-115.52331
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
ID
Idaho
Lemhi
null
4,317
2,957
7,300
0
0
45.088562
-114.00029
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
ID
Idaho
Shoshone
null
1,763
632
2,396
0
0
47.479137
-115.94921
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
MT
Montana
Beaverhead
null
2,563
8
2,571
0
0
45.2519
-112.89686
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
MT
Montana
Cascade
null
1
0
2
0
0
47.008957
-110.806946
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
MT
Montana
Missoula
null
631
3
635
0
0
46.884396
-113.72892
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
MT
Montana
Silver Bow
null
103
1
104
0
0
45.96353
-112.82275
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NM
New Mexico
Grant
null
3,607
492
4,231
0
0
32.727264
-108.274414
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NM
New Mexico
Sierra
null
921
57
1,055
0
0
33.18638
-107.55665
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NM
New Mexico
Socorro
null
65
8
80
0
0
34.02042
-107.022224
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NM
New Mexico
Taos
null
179
1
180
0
0
36.631275
-105.58324
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NV
Nevada
Elko
null
26,736
8,910
35,669
0
0
40.955696
-115.35467
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NV
Nevada
Humboldt
null
22,181
5,141
27,344
0
0
41.266346
-117.81577
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NV
Nevada
Lander
null
28,005
6,199
35,108
0
0
39.853817
-116.75759
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
NV
Nevada
Nye
null
35,788
10,847
47,599
0
0
37.873245
-116.91266
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
OR
Oregon
Baker
null
389
166
557
0
0
44.87625
-117.651634
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
OR
Oregon
Grant
null
699
145
846
0
0
44.582146
-118.36184
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
OR
Oregon
Jackson
null
251
27
278
0
0
42.369713
-123.0138
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
OR
Oregon
Josephine
null
1,150
183
1,337
0
0
42.173332
-123.58082
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
UT
Utah
Beaver
null
2,513
4,223
6,745
0
0
38.37155
-112.97969
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
UT
Utah
Juab
null
99
634
733
0
0
39.539383
-112.95704
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
UT
Utah
Millard
null
1,359
1,003
2,362
0
0
38.984127
-113.143616
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
UT
Utah
Tooele
null
4,874
3,538
8,442
0
0
40.21359
-112.951546
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
WY
Wyoming
Carbon
null
6,884
3,675
10,857
0
0
42.139297
-107.481186
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
WY
Wyoming
Fremont
null
2,727
2,075
5,120
0
0
42.828793
-108.04282
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
WY
Wyoming
Park
null
189
10
199
0
0
44.410637
-108.93396
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00
WY
Wyoming
Sweetwater
null
16
3
19
0
0
41.59947
-110.163925
2026-07-15T00:00:00.000Z
2026-07-19T00:00:00

AuthoriProspector Mining Claim Density by County

Per-county active/filed mining-claim counts (lode vs placer) derived from BLM Mineral & Land Records System (MLRS) data, maintained by AuthoriProspector.

  • Source data: BLM MLRS (U.S. government work, public domain)
  • Snapshot: refreshed Tue Jul 14, 44 counties, 251,205 claims aggregated
  • Interactive map & guides: prospector.authori.us · prospecting guides
  • Updated: 2026-07-19 · re-runnable (weekly refresh job feeds the source index)

Schema (claim_density.jsonl)

Field Type Description
state_abbr / state_name string State
county / county_fips string County + FIPS
active_count integer Active claims
filed_count integer Filed claims
total_count integer Total claims
lode_count / placer_count integer Claim type split
centroid_lat / centroid_lng number County centroid
refreshed_at date Source snapshot date

Query with DuckDB

SELECT state_abbr, county, active_count
FROM read_json_auto('hf://datasets/shannonbox1999/authori-prospector-claim-density/claim_density.jsonl')
ORDER BY active_count DESC LIMIT 10;

Citation

@dataset{authori_prospector_claim_density,
  title  = {AuthoriProspector U.S. Mining Claim Density by County},
  author = {AuthoriProspector (Nagashi Limited)},
  year   = {2026},
  url    = {https://prospector.authori.us}
}
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