Contact Us

​​If you have any questions about the Herkimer Diamond Mines, the KOA Resort, or the Miners' Table Restaurant and Banquet Facility, feel free to reach out to us via phone or email. We will be happy to respond to your inquiry!

For Herkimer Diamond Mines wholesale operations questions, please reach out to our corporate office Phone: 315-717-0175 (weekdays only) or
Email: diamonds@ntcnet.com

Herkimer Diamond Mines Gift Shop, Sluicing & Prospecting:
Phone: 315-717-0175 (weekdays)
Phone: 315-891-7355 (weekends and evenings)

Email: diamonds@ntcnet.com

KOA Resort - Pricing, Availability & Reservations:
Phone: 315-891-7355
Toll-Free: 800-562-0897

Email: hdmkoa@ntcnet.com

Wholesale Opportunities:
Phone: 315-717-0175 (weekdays only) 
Email: diamonds@ntcnet.com 

Mining Groups and Educational Programs:
Phone: 315-717-0175 (weekdays only)
Email:
diamonds@ntcnet.com

Mailing Address for Herkimer Diamond Mines and KOA Resort:
Herkimer Diamond Mines, Inc.,
800 Mohawk Street
Herkimer, NY 13350


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