Big Four Fault
Approximate — check official site before visiting
Geological fault zone part of the Rough Creek Graben system. Exposed rock formations with diverse mineral deposits including fluorite, galena, and smoky quartz. Roadcut and outcrop collecting.
🌐 Visit Official Site →🪨 What You Can Find Here
Anglesite
Also found at:
- No other locations listed yet
Cerussite
Also found at:
- No other locations listed yet
Fluorite
Colorful halide mineral that often forms cubic crystals. The Illinois-Kentucky fluorite district was once the world's leading producer. Also found in New York and Tennessee.
Also found at:
Galena
Lead sulfide mineral with metallic luster, the primary ore of lead. Found in Missouri, Wisconsin, Illinois, and New York's historic mining districts.
Also found at:
Pyromorphite
Also found at:
- No other locations listed yet
Smoky Quartz
Brown to black quartz variety colored by natural radiation. Colorado's Mt. Antero and New Hampshire's pegmatites produce exceptional smoky quartz crystals.
Also found at:
📍 Nearby Locations in Kentucky
Hall's Gap
Stanford, Kentucky · Public Land
Road cut exposures and creek beds producing geodes and calcite crystals in central Kentucky. Good beginner location.
Kentucky-Illinois Fluorite District
Marion, Kentucky · Public Land
Historic fluorite mining district along the Ohio River. Mine dumps produce colorful fluorite, calcite, and sphalerite crystals.
Kentucky Agate Beds
Irvine, Kentucky · Public Land
Estill County gravels for distinctive Kentucky agate — known for red, yellow, and orange banding. Found in creek beds and road cuts.
Mammoth Cave Region Fossils
Cave City, Kentucky · Public Land
Mississippian limestone exposures around Mammoth Cave for fossil corals, crinoids, and brachiopods. Collecting prohibited inside the National Park but...
Agate Alley Gem Mine
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Kentucky's Largest Gem Mine! Choose from 6 levels of treasure buckets ($20-$500) with gems, fossils, agate, and crystals. Covered sluice, wheelchair a...
Little Big Gem Mine & Rock Shop
La Grange, Kentucky · commercial
Family-owned gem mine with 30' sluice. Pre-packaged bags of mining rough. Includes a Rock Shop, sandbox Dino Dig for kids, and free Kentucky geode per...
⛏️ Recommended Gear
Make the most of your visit to Big Four Fault with the right equipment.
Rock Hammer
The most essential rockhounding tool. Choose a hammer with both a flat striking face and a pointed pick end.
Typical: $25-45
Safety Glasses
Mandatory protective gear. Rock chips fly unpredictably when hammering.
Typical: $10-20
Chisel Set
Cold chisels in 3-4 sizes for precise extraction from matrix rock.
Typical: $15-30
Geologist's Pick
A heavier crack hammer for splitting hard rock. Essential for hard rock mining areas.
Typical: $35-60
Sifting Screen
Stackable mesh screens for sifting gravel and dirt. Essential for gem and fossil hunting.
Typical: $20-40
UV Flashlight
Long-wave UV light for finding fluorescent minerals and Yooperlites.
Typical: $15-35