Gold Mine Waste: How Particle Size Affects Water Pollution in Tanzania

Ever wondered how tiny pieces of rock from a gold mine can cause big problems? In Tanzania, waste rocks from gold mining are a real headache. Scientists tested different sizes of these rocks - from little ones smaller than a pea to big ones like a chicken egg. They found that tiny rocks can make the water around them very acidic, with a pH as low as 3. 5. This acidic water can leak out dangerous metals like manganese, zinc, and iron. Big rocks, on the other hand, made the water less acidic, with a pH of about 6. 5. So, the smaller the rock, the bigger the problem. It’s like when you’re eating a sandwich - the smaller the pieces, the quicker you finish it, and the faster you might get a stomach ache! To keep our water clean, scientists suggest we separate the tiny rocks from the big ones during and after mining. This way, we can reduce the risk of these metals leaking into our water and causing pollution. It’s like sorting your laundry - you don’t want to mix your whites with your colors, right? The same goes for mine waste rocks.