The Times Australia
The Times World News

.
The Times Real Estate

.

Heavy mercury contamination at Maya sites reveals a deep historic legacy

  • Written by Duncan Cook, Associate professor, Australian Catholic University
Heavy mercury contamination at Maya sites reveals a deep historic legacy

Mercury is a toxic heavy metal. When leached into the natural environment, it accumulates and builds up[1] through food chains, ultimately threatening human health and ecosystems.

In the last century, human activities have increased atmospheric mercury concentrations by 300-500% above natural levels[2].

However, in some parts of the world, humans have been modifying the mercury cycle for thousands of years. This anthropogenic (human-caused) mercury use has led to mercury entering places globally it wouldn’t otherwise be found, such as in lakes or soils[3] in remote locations.

One region with an especially long (but poorly documented) history of mercury use is Mexico and Central America. Early Mesoamerican societies such as the Olmec had been mining and using mercury in southern Mexico as early as 2000 BCE.

This map of Mexico and Central America shows sites where liquid mercury has been found, known geological sources, and Maya sites with elevated soil mercury. https://www.frontiersin.org/articles/10.3389/fenvs.2022.986119/full, Author provided

In our research, published[4] in Frontiers in Environmental Science, we review the ways the Maya used mercury, the mystery of how they sourced it, and the environmental legacy of past mercury use.

Our present mercury problem has a deep legacy. Understanding its origins will also help us understand the trajectory of humanity’s fascination with, use of – and abuse of – this mercurial element.

Read more: How poisonous mercury gets from coal-fired power plants into the fish you eat[5]

Cultural and creative importance

Archaeologists have been finding mercury at archaeological sites in Mexico and Central America for more than a century.

The most common form reported is cinnabar (mercury sulfide, or HgS), a bright red mineral used extensively by the ancient Maya for decoration, craft, and ritual purposes such as burials and in tombs.

The Maya used cinnabar in burials, identifiable by its distinct red colour. Maya Gallery, National Museum of Anthropology/Wikimedia Commons, CC BY[6][7]

It has been far less common to find liquid (elemental) mercury. There are only seven occurrences of liquid mercury at Mesoamerican sites that we are aware of.

But it’s feasible there may have been many more – and that it’s simply invisible in today’s archaeological record. Liquid mercury from 1,000 or more years ago could have evaporated or oozed away into the environment through time.

Exceeding toxic levels

Most Maya settlements were great distances from known mercury sources located in Mexico and Honduras, and perhaps Guatemala and Belize. This means the production, trade, and use of mercury would have been highly valuable and logistically challenging – especially for managing toxic liquid mercury!

Over the past two decades, scientists working on Maya archaeological projects have tested artefacts, soils, and sediments for their chemical properties, including for mercury, to better understand past human activities.

They test soils and former Maya areas excavated from far below today’s ground surface, which tell us about mercury levels during the Maya’s time.

Rob Griffin sampling sediments for mercury near the bottom of the Corriental reservoir in Tikal, Guatemala. Nick Dunning

Combined data from these tests show most Maya sites have some amount of mercury enrichment in buried soils. Specifically, seven out of ten sites were found to have mercury levels that equal or exceed modern benchmarks for environmental toxicity.

Locations with elevated mercury are typically areas the Maya occupied, including domestic patios, dating to the Late Classic (600-900 CE). Mercury also made its way into some drinking water sources including central reservoirs at Tikal.

While the appealing red cinnabar ore is the likely culprit of mercury pollution, the equally appealing and shimmering liquid mercury is another possible source of persistent pollution in some locations, such as Lamanai in modern-day Belize.

Droplets of silvery liquid metal
Mercury, also known as quicksilver, occurs naturally and is the only metallic element that stays liquid at room temperature. MarcelClemens/Shutterstock

At more complex sites, elevated mercury levels may be the result of both modern and ancient inputs. For example, it’s not clear if the mercury detected at the island Maya settlement of Marco Gonzalez (also in Belize) is from ancient or modern times.

Read more: Belize shows how local engagement is key in repatriating cultural artifacts from abroad[8]

Looming questions

Our work reveals a rich history of mercury use by the Maya and challenges the idea that pre-industrial societies didn’t have noteworthy impacts on their environments.

But there is much we still don’t know. Where and how did the Maya obtain mercury? Who mined it, traded it, and transported it by foot over hundreds of kilometres across present-day Central America?

Then there’s the question of whether the Maya were affected by mercury exposure. The next step will be for geochemists and archaeologists to track down the source of mercury at key sites and, if possible, scrutinise archaeological and human remains for signs of past mercury exposure.

We also need to find out what forms mercury takes in the environment today, so we can better understand where it came from, and provide guidance on what precautions (if any) need to be taken when working with legacy mercury.

Finding clues on early mercury use is crucial to understanding the interaction between legacy mercury and current mercury contamination in the environment today.

Read more: Climate, conflict, collapse: how drought destabilised the last major precolonial Mayan city[9]

Read more https://theconversation.com/heavy-mercury-contamination-at-maya-sites-reveals-a-deep-historic-legacy-191325

The Times Features

Itinerary to Maximize Your Two-Week Adventure in Vietnam and Cambodia

Two weeks may not seem like much, but it’s just the right time for travelers to explore the best of Vietnam and Cambodia. From the bustling streets of Hanoi to the magnificent te...

How to Protect Your Garden Trees from Wind Damage in Australia

In Australia's expansive landscape, garden trees hold noteworthy significance. They not only enhance the aesthetic appeal of our homes but also play an integral role in the local...

Brisbane Homeowners Warned: Non-Compliant Flexible Hoses Pose High Flood Risk

As a homeowner in Brisbane, when you think of the potential for flood damage to your home, you probably think of weather events. But you should know that there may be a tickin...

Argan Oil-Infused Moroccanoil Shampoo: Nourish and Revitalize Your Hair

Are you ready to transform your hair from dull and lifeless to vibrant and full of life? Look no further than the luxurious embrace of Argan Oil-Infused Moroccanoil Shampoo! In a...

Building A Strong Foundation For Any Structure

Building a home or commercial building can be very exciting. The possibilities are endless and the future is interesting. You can always change aspects of the building to meet the ...

The Role of a Family Dentist: Why Every Household Needs One

source A family dentist isn’t like your regular dentist who may specialise in a particular age group and whom you visit only when something goes wrong. A family dentist takes proa...

Times Magazine

"Eternal Nurture" by Cara Barilla: A Timeless Collection of Wisdom and Healing

Renowned Sydney-born author and educator Cara Barilla has released her latest book, Eternal Nurture, a profound collection of inspirational quotes designed to support mindfulness, emotional healing, and personal growth. With a deep commitment to ...

How AI-Driven SEO Enhancements Can Improve Headless CMS Content Visibility

Whereas SEO (search engine optimization) is critical in the digital landscape for making connections to content, much of it is still done manually keyword research, metatags, final tweaks at publication requiring a human element that takes extensiv...

Crypto Expert John Fenga Reveals How Blockchain is Revolutionising Charity

One of the most persistent challenges in the charity sector is trust. Donors often wonder whether their contributions are being used effectively or if overhead costs consume a significant portion. Traditional fundraising methods can be opaque, with...

Navigating Parenting Arrangements in Australia: A Legal Guide for Parents

Understanding Parenting Arrangements in Australia. Child custody disputes are often one of the most emotionally charged aspects of separation or divorce. Parents naturally want what is best for their children, but the legal process of determining ...

Blocky Adventures: A Minecraft Movie Celebration for Your Wrist

The Minecraft movie is almost here—and it’s time to get excited! With the film set to hit theaters on April 4, 2025, fans have a brand-new reason to celebrate. To honor the upcoming blockbuster, watchfaces.co has released a special Minecraft-inspir...

The Ultimate Guide to Apple Watch Faces & Trending Wallpapers

In today’s digital world, personalization is everything. Your smartwatch isn’t just a timepiece—it’s an extension of your style. Thanks to innovative third-party developers, customizing your Apple Watch has reached new heights with stunning designs...

LayBy Shopping