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photo: Alison Perkins (Sistema Monkey Dust, Cenote Borge)

La Mina

In 2017, underwater cave explorers Fred Devos,  Christophe Le Maillot, and Sam Meacham of CINDAQ found what is believed to be evidence of ancient mining while exploring and mapping new tunnels of an underwater cave near Akumal, QR.

The Maya are known to have actively mined pigment and other minerals from the caves of the Yucatan Peninsula, but the ancient mines discovered by the CINDAQ team are now submerged, indicating that such mineral exploitation also occurred more than 5000 years ago in preceramic times. At the end of the last Ice Age, intrepid miners ventured deep into these tunnels with torches in hand. The trail markers, mining debris, and deep pits they left behind thousands of years ago are now entirely underwater.

Research into the site is being led by Pilar Luna Erreguerena and Roberto Junco of the Subdireccion de Arqueología Subacuática del INAH.  This work is just beginning.  The CINDAQ team is completing site documentation and 3-dimensional modeling of the mine and its many features.  Researchers from Mexico, Canada, and the United States have sampled and analyzed the exposed mineral deposits to learn what commodities were being sought and to radiocarbon date wood from ancient fires to establish when this mine was active. Their finds are being prepared for publication and what they learn will enhance our understanding of pre-Maya economic activity in the Yucatan Peninsula.

To accomplish a thorough and detailed documentation of this remarkable site, the CINDAQ team performed 78 dives, totaling nearly 500 diver hours underwater. In all, 19 divers were involved in the mapping effort. An additional 100 diver hours were dedicated to acquiring the nearly 18,000 images used for the 3D photogrammetric models, which are enabling researchers to “virtually” access and study this remote subterranean mining complex. 

We are grateful for the support of landowner Adolfo Ruiz-Ortega and his family.

Research Team

Pilar Luna Erreguerena - INAH SAS

Roberto Junco - INAH SAS

Dr. Brandi Lee McDonald - The University of Missouri Columbia

Dr. Eduard Reinhardt - McMaster University

Dr. James Chatters - Paleoscience

Dr. Dominique Rissolo - UCSD Cultural Heritage Engineering Initiative

Dr. Barrett Rock - The University of New Hampshire

Eric Lo - UCSD Cultural Heritage Engineering Initiative

Exploration Team

Fred Devos
David Dusek
Vicente Fito *
Gabriel Gasca *
Martin Gaspar *

Osama Gobara
Chris Le Maillot
Sam Meacham
Rogelio Mier *

Wiliam Ortega *

* original explorers

Mapping Team

Benjamin Beyer
Angelica Chimal Teh
Fred Devos
David Dusek
Peter Sprouse
Mathijs Geenen
Osama Gobara
Nicole Heuer
Larry Keele
Chris Le Maillot
Gideon Liew
Anke Löbel
Sam Meacham
Alison Perkins
Cameron Russo
Dijana Stuper
Flip Vernooij
Cholo de Villa
Miko Zuleto

Photogrammetry Team

Fred Devos

David Dusek

Mark Garland

Chris Le Maillot

Sam Meacham

Alison Perkins

Boxfish 360˚ Camera Team

Fred Devos

Sam Meacham

Russell Hughes

The model above is an area that really was our first clue that something was amiss.  The red and white scale is 50cm long.  As you navigate the model you can see the clear edge where the floor was broken.  The spoil is piled up behind.  The color of the rock spoil is red from the ochre that was being extracted.  This is just one small area, but it is indicative of the rest of the site.  What astounds us is the level of organization and physical effort that would have been necessary to carry out this work, bring wood in for fires, and carry out the mined ochre.

You will have better control navigating the model with a mouse rather than a track pad.

The model above is of another area that demonstrates clear mining activity.  To the right side of the model you will see a number of large sized rocks and speleothems piled on the floor.  The yellow colored formation in the middle left of the floor would have formed after this area had been mined. 

You will have better control navigating the model with a mouse rather than a track pad.

Sagitario 'La Mina'

The video above is a fly through of a 1.2 billion point cloud model that covers @175 meter of La Mina at an average depth of @9-10 m.  The model is comprised of @9000 photographs taken over @6 dives using a Sony A7S camera and Canon 16-35 mm lens housed in a Nauticam NA-7 housing.  The cave was illuminated using two camera mounted Big Blue Black Molly video lights. 

 

The model took @89 hours to render on supercomputers at UCSD's Cultural Heritage Engineering Initiative using Agisoft Photoscan software.  The fly through was created on Viscore. 

The value of such models is to allow anyone to virtually 'visit' the site without causing any impact.

In the model you will see the clear and irrefutable evidence of human mining activity.  Rock cairns, excavated pits, and mine spoils piled on the sides are all signs of this activity. 

The white square markers you see on the bottom were placed periodically throughout the cave in order to help the modeling software to orient itself.

We are grateful for the support and expertise of UCSD CHEI, Dr. Falco Kuester, Dr. Dominique Rissolo, Vid Petrovic, Eric Lo, and Danylo Drohobytsky