Posted on 7th April 2017 by Paul King
In this Case Study: Gold Mining Environmental impact, we explore how gold mining operations tackle environmental challenges related to heap-leaching solution ponds. During gold extraction, crushed ore is irrigated with a dilute alkaline cyanide solution. This “pregnant solution” dissolves precious metals and drains into storage ponds through liners at the bottom of the heap. These open solution ponds pose risks to waterfowl and can cause significant water loss through evaporation.
Traditionally, mines covered these ponds with netting to protect birds. However, netting is costly, difficult to maintain, and often damaged by winter storms. It also fails to adequately camouflage the liquid surface from wildlife.
The innovative solution lies in using Euro-Matic Bird Balls™ — floating plastic balls that form a dense, camouflaging layer on the water. These balls adjust with changing liquid levels and can easily accommodate equipment like floating pumps or aerators. Their black, UV-stabilized surface helps deter birds from landing by disguising the water.
Water conservation is critical in mining, especially in remote or arid areas. A single layer of Bird Balls covers about 91% of the water surface, reducing sunlight penetration and evaporation. Additionally, the insulation provided by the balls helps maintain stable water temperatures during cold months, optimizing chemical performance.
Unlike fragile netting, Bird Balls offer a low-maintenance, one-time solution. Installation is simple — just pour the balls from their packaging onto the pond surface. Wind and snow have minimal effect, ensuring reliable protection year-round.
Manufactured from high-density polyethylene, each 100mm diameter Bird Ball weighs about 40g. For full coverage, about 116 balls per square meter are needed. For areas exposed to stronger winds, heavier water-filled balls weighing 240g provide extra stability.
With over 30 years of experience, Euro-Matic provides a trusted, eco-friendly option to reduce environmental impact in gold mining operations.
