Brilliant study of the meshing of urbanization and gold mining in Johannesburg, South Africa by Dorothy Tang and Andrew Watkins (on Design Observer). As mentioned in the article and accompanying photo essay; " In particular, the 80-kilometer mining belt between the two cities is riddled by deep-shaft mines, where companies built an extensive network of underground tunnels and moved large amounts of earth to the surface. These operations have weakened geological strata, disrupted natural drainage patterns and altered ecological habitat. The original semi-arid grasslands ecology is now converted to an urban forest, and sediment from mining waste has blocked natural waterways, unexpectedly creating wetlands with rich bird habitat."
:: image via Design Observer