Welcome back to Valkenburg! #MegaUnterTage


We are looking forward to welcoming you on June 23, 2018 from 9am to 6pm.


Event Adress: Daalhemerweg 31, 6301 BJ Valkenburg, Niederlande






And this time we go with you under the ground! We meet in one of the most beautiful mines ever! A visitor mine grown over 100 years that gives great insights into coal mining.


This year you will find activities like children activities (e.g. a balloon artist, face painting, mineral and fossil search, a play area), geocaching shops, miners who guide you through the mining area and give answers to all your questions, a varied gastronomy, a geocoin meeting and a woodcoin exchange meeting , a photo corner, the conductor of the Muttenthalbahn (a miniature railway) and as usual a fancy logbook. All these activities will take place within the demonstration mine. In addition supplemental program items are available like "biking underground" and "climbing in the mountain".


You would like to support us financial to organize this MEGA event? You can send a contribution of your choice through PayPal.


For the first time this year there will be the opportunity to shape your eventcoin locally in the style of old miner tags!

New in 2018: This year we have to combine our event with a small entrance fee (children are of course still free). Included in this admission fee is entrance into the mountain with access to all shops, exhibits, etc., a themed event ribbon and a beautifully designed event booklet that will give you hints to our labcaches. Also you will have free access into the demonstration coalmine. In addition, every adult visitor automatically participates in a raffle.


In order to miss nothing place a Will Attend log! We will keep you informed by sending out announcements!


The new bonus card from the team for geocachers and miners!

Ganz neu ist unsere optionale Mitgliedskarte zum Ausgabepreis von nur 10 Euro, mit dieser Karte erhaltet Ihr nicht nur den kostenlosen Zugang zum Event sondern ab 2018 auch Rabatte bei zahlreichen Befreundeten Bergwerken, Schauhöhlen und Bunkeranlagen in ganz Deutschland, Belgien und den Niederlanden.

⚒ Issue price 10 Euro + 3 Euro shipping as delivery-registered mail (NL and DE only)


⚒ Discounts at many mining and industrial partners


⚒ Special offers for clothing or our geocoins


⚒ Invitation to all our events above and below ground


⚒ Free access to our MEGA Event 2018

Our event coins 2018 will be minted right before your eyes by a skilled artisan (information in the description)!

Gold Version

Silver Version

Our event pin made by Laser Logo Shop & the new event shirts "Glow in the Dark" by the team!