There are calls for the state government to force mining companies to fill open cut mine voids once mining has wrapped up.
A report has found at least 45 final voids are planned or approved across NSW covering an area larger than Sydney Harbour, with the Four largest in the Hunter Valley.
It's feared ground and surface water could turn the voids into gigantic salt water lakes, causing permanent damage to the environment.
However, mining companies are reluctant to back-fill the massive holes as it can cost hundreds of millions of dollars
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| Photo Courtesy theconversation.com |
