RockWoofSketch map
Woof’s favorite find
Caddo Mine
We picked it because its USGS record mentions 1 gem or collectible mineral (Quartz) and 2 of our card minerals overall. That ties with 1 other site(s), so we broke the tie by mine status (past producers first), then USGS record quality, then name. USGS lists it as past producer for Mercury. Minerals mentioned: Quartz, Pyrite. Approx. location 34.163, -93.407. USGS record.
Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.
Field cards: what kind of sites?
Produced ore or material at some point in the past.
Explored or test-dug, with no recorded production.
A processing plant site.
Status not recorded.
The mineral was noted here, without development.
Status terms come from USGS MRDS records.
Mineral cards
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
2 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
2 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
Minerals recorded here
Cinnabar 4Calomel 2Metacinnabar 2Stibiconite 2Stibnite 2Commodities
Mercury 5Aluminum 2Antimony 1Sites
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Caddo Mine | Mercury | Calomel, Cinnabar, Metacinnabar, Stibiconite, Stibnite | Past Producer | 34.163, -93.407 |
| Humphreys Mine | Mercury | Calomel, Cinnabar, Metacinnabar, Stibiconite, Stibnite | Past Producer | 34.162, -93.395 |
| Hill 34 | Mercury | Cinnabar | Past Producer | 34.176, -93.444 |
| Okolona Road | Mercury | Cinnabar | Occurrence | 34.160, -93.382 |
| Robert P Patterson Plant | Aluminum | — | Past Producer | 34.067, -93.077 |
| Ozan Lumber Co. | Antimony | — | Prospect | 34.242, -93.122 |
| (Facility) Arkadelphia Smelter | Aluminum | — | Plant | 34.117, -93.100 |
| Victory Mining Company | Mercury | — | Unknown | 34.165, -93.418 |
Fossil collections
The Paleobiology Database lists 28 fossil collection records in Clark County. These are research records, not public dig sites.
Nearby counties
Pike County · Montgomery County · Hempstead County · Howard County · Hot Spring County
Arkansas mineral guides
Back to all Arkansas counties.
How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.
Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.
Updated