state_abbr stringlengths 2 2 | state_name stringlengths 4 10 | county stringlengths 3 26 | county_fips null | active_count int64 1 35.8k | filed_count int64 0 10.8k | total_count int64 2 47.6k | lode_count int64 0 0 | placer_count int64 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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