Part of our ongoing series on the environmental and human impact of diamond mining | Ethica Diamonds, Newquay, Cornwall
When most people think about the environmental damage caused by diamond mining, they picture the obvious things. The enormous open pit excavated from the earth. The mountains of displaced rock and soil. The scarred landscape left behind when operations close.
What is less immediately visible - but in many ways more damaging - is what happens to the water.
Water does not respect the boundaries of a mine site. It moves through the ground, connects ecosystems, feeds communities, and sustains wildlife across vast areas. When mining operations contaminate it, the consequences ripple far beyond the pit itself.
This is what that looks like in practice.
Acid Drainage and Groundwater Contamination
Deep beneath the surface of most mining sites, minerals containing sulphides sit undisturbed. In their natural state, these minerals are stable. But when large scale excavation exposes them to air, they oxidise and form sulphuric acid.
This acid then seeps into the groundwater, contaminating water sources that communities and wildlife depend on. In Sub-Saharan Africa, where clean, accessible water is already scarce, this process has caused serious and long lasting harm.
The damage is not always dramatic or immediately visible. Sometimes it is a subtle shift in the pH balance of a water source, or a slight increase in silt levels. Changes that seem minor but are enough to destroy the microscopic aquatic life on which entire food chains depend. When the bottom of the food chain collapses, everything above it follows.
Even low level water contamination from mining can collapse an entire local ecosystem. The effects are rarely immediate and rarely make the headlines - but they are real and they are lasting.
Waste Dumped Directly Into Water Sources
Heaps of waste rock and mining tailings need somewhere to go. The solution adopted by many mining operations - including in Canada, a country that presents itself as an environmental leader in mining - is to designate natural water bodies as waste disposal sites.
Canadian regulations include a provision that allows any natural water body to be reclassified as a tailings impoundment area. In practice, this means that a thriving, ecologically rich lake can have its legal designation changed, stripping the wildlife within it of any legislative protection, and allowing mining waste to be dumped into it freely.
This is not a loophole that exists only on paper. It is actively used. Lakes that were pristine, biodiverse ecosystems have been legally reclassified and used as waste dumps for mining operations. The photographs of the resulting water discolouration - contamination visibly spreading into previously clear water - are difficult to look at.
Pumping Poisoned Water Into River Systems
Many diamond mines extend below the water table, which means they require continuous pumping to keep operations from flooding. The water extracted by this pumping is typically discharged back into local river systems.
That discharged water carries with it whatever the mining process has introduced - sewage, industrial detergents, and metals including zinc, lead, mercury, and arsenic. Communities living downstream have no way to avoid it. Their drinking water, their livestock's water, the rivers their children swim in - all of it receives whatever the mine upstream decides to pump out.
The consequences for communities downstream of mining operations are well documented and deeply serious. Skin conditions, digestive illness, and in the most severe cases, death. In Zimbabwe, a diamond processing plant discharged into the Odzi River, and hundreds of cattle died after drinking the water. The communities in that area had no alternative water source.
A BBC News report documented a toxic leak from an Angolan diamond mine that killed twelve people in the Democratic Republic of Congo. Twelve people. From a diamond mine. This is the supply chain that a mined diamond enters the world through.
Read the news article here >>>
The Human Demand on Local Water Supplies
Beyond contamination, there is the simple question of consumption. When a mine opens in a previously uninhabited or sparsely populated area, it brings with it a large workforce whose daily water needs are substantial. That water has to come from somewhere.
In areas where water resources are already limited, mining operations drawing from local sources reduces what is available to wildlife - and to the communities that were there before the mine arrived. Lower water levels disconnect previously linked pools and water bodies, a phenomenon known as fragmentation.
Fragmentation has serious consequences for wildlife populations. Species that evolved in connected water systems suddenly find themselves isolated in shrinking pools. Genetic diversity falls. Disease susceptibility rises. Populations that were stable begin to decline.
What Happens After the Mine Closes
The story does not end when a mine stops operating. Abandoned mine pits gradually fill with water, creating large bodies of stagnant water in landscapes that were not previously home to them.
In Sierra Leone, this has created a significant and ongoing public health crisis. The stagnant water in abandoned diamond mine pits has become a breeding ground for malaria-carrying mosquitoes. Communities living near former mining sites face a dramatically elevated risk of malaria as a direct consequence of an industry that has long since left.
The diamonds were extracted and sold. The profits were taken elsewhere. The malaria remains.
The true cost of a mined diamond is not paid at the point of sale. It is paid for years and decades afterwards by communities, wildlife, and ecosystems that had no say in the matter.
Why This Matters When You Choose a Ring
We are not telling you this to make you feel guilty about a ring you already own, or to suggest that everyone involved in diamond mining is acting in bad faith. The reality is far more complicated than that.
We are telling you this because we think you deserve to understand the full story behind the choices available to you. A lab grown diamond, grown using renewable energy in a controlled environment, does not carry any of these costs. No water contamination. No acid drainage. No communities poisoned downstream. No abandoned pits breeding malaria.
It is the same stone, chemically and physically. The difference is entirely in how it came into the world.
At Ethica Diamonds in Newquay, every stone we sell is lab grown and sourced from producers using renewable energy or verified carbon offsetting. We choose our suppliers carefully because we think the story behind your ring should be one you can tell without hesitation.
More in This Series
This blog is part of our ongoing series on the true cost of mined diamonds. You can read the other parts below:
The True Cost of Mined Diamonds: The Impact on Wildlife →
The True Cost of Mined Diamonds: The Human Cost, Part 1 →
The True Cost of Mined Diamonds: The Human Cost, Part 2 →
Lab Grown Diamonds and the Environment: The Honest Truth →
Choose a diamond with a story you are proud of →
Explore our full collection of lab grown diamond engagement rings at ethicadiamonds.com or book a free consultation with our team in Newquay - in person or virtually from anywhere in the UK.
