Century Mine

From the top of Lookout Hill, I could see the slag heaps of Century Mine on the horizon.

Century Mine from Lookout Hill

The mine is one of the biggest open-cut mines in Australia (perhaps the biggest), meaning it is a very, very big hole in the ground. They mine zinc and lead ore here, and it’s been going for 20 years.

Because it is an isolated place, and prone to flooding in the Wet, they had to build a lot of very clever infrastructure. They crush the ore and then dilute it with water. Then they pump it through 300km of pipes to Karumba in the Gulf of Carpentaria, where they ‘dewater’ the ore, put it on barges, and haul it 50km out to sea and on to the big export ships.

Century Mine from Lookout Hill

Hubby and a few of his colleagues got to go on a short visit, and he said the scale of everything, from the ‘tonka trucks’ to the big hole, was impressive. This is one of those operations where workers are flown in and out via their private airport, and where everything is self-contained.

The thing that got me about a mining operation like this is how efficient it was compared to, say, public transport in Sydney. I guess people in this country can make the effort to be efficient when there’s big money about. Public infrastructure however, makes no money, and so we’re left in the dark ages.

This mine is actually wrapping up operations pretty soon. But I doubt mining will disappear completely from the Lawn Hill area – there are plenty of other minerals about.

Cambrian Life

I wasn’t out in the field everyday (I was on holidays after all), but I liked to see what people brought in at the end of the day. One afternoon, Hubby returned with slabs of Cambrian trilobites and brachiopods. I was very happy because trilobites are my favourite fossils.

Fossils from Entrance Creek

I like their other-worldliness, these fossils being representatives from another time – when the Gulf Country and most of Eastern Australia was still under water, and when the only creatures on land were insects and spiders. Hubby suspected that there may be a new species in those slabs – he was only partially right.

This trilobite is a known species in the Gulf.

Fossils from Entrance Creek

We’re yet to find out what species this is.

Fossils from Entrance Creek

The ridged brachiopod (shell) is a known species, but those specimens came from western NSW. We’re yet to find out what species the smooth brachiopod is.

Fossils from Entrance Creek

These are giant burrows of some kind. So far no one has any idea of what could have made them. It must have been big, scary thing, whatever it was.

Fossils from Entrance Creek

And lastly, these are fossilised mud cracks! Surprising the things that survive.

Fossils from Entrance Creek

Impact Crater

The landscape at the last water bore we visited was flat.

Water monitoring

Very flat.

Water monitoring

I was later told that we were inside an impact crater from a meteorite which fell to earth hundreds of millions of years ago. Later I looked the area up on Google Maps, and what do you know, it did look like a crater. Whereas the surrounding hills were all in lines and curves, the hills around the crater was definitely a circle.