Ace Of Diamonds Mine
Rockhounding site in Middleville, New York · Quartz & Crystals
Ace Of Diamonds Mine is a quartz rockhounding site near Middleville, NY. Fee required. Best season: May through September.
Typical season: May through September
Key facts
Structured details for trip planning — verify access and fees with the land manager before you visit.
- Specimen type
- Quartz
- Primary specimens
- Herkimer Diamond, Calcite, Sphalerite
- Fee status
- Fee required
- Nearest town
- Middleville
- State
- New York
- Coordinates
- 43.03000, -74.97000
- Best season
- May through September
- Access difficulty
- Easy to moderate open pit digging
- Camping
- Nearby Herkimer area campgrounds
- Activities
- Crystal fee digging
- Facilities
- Mine office, tool rental, shade
- Last updated
- July 5, 2026
What to pack for Ace Of Diamonds Mine
Gear we compare for quartz & crystals trips like this one — tools, safety, and the hike in.
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The experience
- Best time to visitMay through September
- AccessEasy to moderate open pit digging
- FacilitiesMine office, tool rental, shade
- Camping nearbyNearby Herkimer area campgrounds
Things you need to take to Ace Of Diamonds Mine
Estwing 22 oz Geological Pick
If you buy one hammer, make it this one.
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ASR Outdoor 38pc Deluxe Rock Hounding Kit
The kit to buy when you want prospecting-grade accessories, not just a hammer in a bag.
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Rock Chasing US Rocks & Minerals Field Guide
The guide to clip on your pack when you do not know what you are looking at yet.
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BelOMO 10x Triplet Loupe
The loupe to buy once and carry for decades.
Check price on AmazonDisclosure: Gear links may earn a commission as an Amazon Associate — at no extra cost to you. Learn more.
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Report an access change
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Map & location
Sources & updates
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