---
url: https://www.eurocovers.eu/industries/mining
title: Floating covers for mining tailings and process water
description: Reduce evaporation, dust, and chemical exposure on copper, gold, and lithium tailings ponds with patented hexagonal floating covers.
updated: 2026-05-25
---

# Floating covers for mining tailings and process water

Reduce evaporation, dust, and chemical exposure on copper, gold, and lithium tailings ponds with patented hexagonal floating covers.

Hexagonal floating covers reduce evaporation, dust, and chemical exposure on mining tailings and
process water by 90%+ — recouping capex within 12–24 months on water savings alone for arid-region
mining operations.

## What floating covers do for mining

Mining tailings ponds and process water reservoirs are typically located in arid or semi-arid
regions (Chile, Australia, Spain, Western US). Open water surfaces evaporate 1,500–3,000 mm per
year, equivalent to 15,000–30,000 m³/year per hectare. For lithium, copper, and gold operations
where water is the constraining input, that loss is a significant operating cost.

Hexagonal floating covers reduce evaporation by 90–97%, suppress dust emission from the water
surface, and reduce chemical exposure at the water-air interface.

## How they work

- **Self-ballasting hexagonal HDPE elements** tessellate across the tailings or process water surface.
- **No anchors** — appropriate for moving water levels and irregular shorelines.
- **Deployment without draining** — installable on active reservoirs.

## Benefits for mining operators

| Metric | Value |
|---|---|
| Evaporation reduction | 90–97% |
| Dust emission reduction | Significant |
| Chemical exposure reduction at water-air interface | Yes |
| Payback period | 12–24 months in arid regions |
| Lifecycle | 25+ years |

## When to use covers in mining

- Tailings storage ponds in arid or semi-arid regions
- Lithium evaporation ponds where coverage is differential (partial cover for evaporation-rate management)
- Process water reservoirs
- Heap leach solution ponds (where chemistry permits)

## Floating covers vs. mining alternatives

Mining operators considering water-management approaches typically weigh four options:

- **Floating cover** (hexagonal modular). 90–97% evaporation reduction, 25+ year lifecycle, no anchors, deployable on active reservoirs.
- **Geomembrane lining** (sub-surface). Addresses seepage, not evaporation. Often used in combination with floating covers.
- **Chemical surfactant monolayer**. 20–50% evaporation reduction; reapplication every 1–4 weeks; not durable in wind.
- **Recycling/treatment**. Capex-intensive (typically 10–50× cover capex per m³/day capacity); justified at very high water cost.

For most arid-region mining operations, floating covers deliver the best combination of capex,
lifecycle, and operational simplicity. See the [floating-balls comparison](/vs/floating-balls) and
the [geomembrane comparison](/vs/geomembrane) for direct head-to-head detail.

## Regulatory context

Mining operators reporting under the EU Industrial Emissions Directive, the ICMM Water Stewardship
Framework, and increasingly under CSRD water-disclosure requirements benefit from the measurable
water savings and emission reductions floating covers provide.

## Related

- [Evaporation control](/solutions/evaporation-control)
- [Hexprotect® AQUA](/products/hexprotect-aqua)
- [Hexagonal vs. floating balls comparison](/vs/floating-balls)
- [Mining ROI worked example](/knowledge/floating-cover-roi-mining-operations)