The spectacular site known as Horizontal Falls already hosts twenty thousand visitors per year and is a mainstay of the Broome and Derby tourism economy. Any mining adjacent to the Horizontal Waterfalls will have a catastrophic effect on water quality, marine biodiversity, and also on the intrinsic beauty of the area that is such a drawcard for visitors.
In 2011 A copper mine was proposed by Pegasus Metals to drill immediately adjacent to Horizontal falls.
The existing mines at nearby Cockatoo and Koolan Islands give some idea of what awaits the Horizontal Waterfalls if the Pegasus project were allowed to proceed.
Robin and the Green's led a petition which was partially influential in the decision to surround Horizontal Falls with a 72-square kilometre exclusion zone in 2012. This move saw several companies withdraw their applications to explore including Pegasus Metals proposed project.
The 2012 mining ban itself is set to be reviewed every two years and can be seen below.
Barnetts Exclusion zone stopped a few tenements, but wasn't the be-all and end-all for mining in and around Horizontal Falls. This can be seen in the photo below which shows a 2013 update for a Marine and land National park around Horizontal falls. Around fifty percent of protected land and thirty percent of protected water are situated in current exploration tenements.
Robin called for the WA Government to revoke all exploration tenements in the new national park but that did not happen. As of 2015 mining companies still have licences to explore around Horizontal Falls for deposits, but require approval to mine.
The state governments May budget saw continued funding for a large conservation park in the Kimberley go ahead, including a national park in Horizontal falls.