Kalijamite Considerations

Posted by RubyIGuess on 12 February 2020 in English (English)

While initially my plans for Kalijamite were to make it a Yosemite-like national park, some new considerations made me reconsider this plan (particularly inspired by some suggestions by Alessa).

Notably, the fact that a large impact like this often has some very interesting effects on the local area's ore deposits. Take for example the Sudbury Basin, where large amounts of ores were ejected out from below the earth. This has made Sudbury one of the world's largest mining centers.

I feel like this would allow for a lot more expansion on the area itself, since mining towns could erupt around the coastal mountain range. This could be a very economically important area.

I'm not sure what to do, but I'll give this more thought. Suggestions are welcome.

Comment from RubyIGuess on 13 February 2020 at 03:25

I like the idea, but hotsprings like those require a lot of geothermal activity and I don't know if that's entirely compatible with the crater idea.

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Comment from Marcello on 13 February 2020 at 13:23

Crater and geothermal activity are independent, so it's your choice whether to combine them or not. If you go for a Sudbury -style of town, don't forget to put an OGF -version of 'Science North' in it, one of the best musea in the known universe.


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Comment from Yuanls on 13 February 2020 at 13:26

In order to create a site such as Sudbury you need two things: time and scale. A large crater in order to create enough magma so sufficient amount of minerals precipitate out and survive over geological time. Then enough time for the magma to solidify, enough time to put any global and lasting environmental effects behind the present day. and enough time for erosive activities and tectonics to cause uplift and erosion, exposing the minerals at an accessible depth. The only two impact sites which are extensively mined are Sudbury in Canada and Vredefort in South Africa. Both these craters are billions of years old and hundreds of kilometres in diameter.

Your impact crater is around 7 or 8km across and is situated in the tropics, in a coastal area with a lot of erosion. Your crater is pretty well preserved and it hasn't been infilled with sediment - you can still see its rim, central peak in the sea that has filled it This means geologically it's pretty young. The moon is a very bedrock-dominated landscape that experiences no erosion, which is why your crater currently looks so 'fresh'. If you're intending to create a large, old crater on Earth at this latitude, you've got to take into account erosive processes too.

In short, I don't think your crater, as it currently is, is large enough or old enough to be economically viable as impact craters are in the real world. The alternative option is for a crater to excavate preexisting mineral deposits and bring them to the surface during impact. As these deposits would be underwater, the question would be if it was economically viable to mine under the seabed on an island.

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Comment from Yuanls on 13 February 2020 at 13:31

The hydrothermal route is a direction worth exploring though, I can see it happening if enough residual heat was left from the impact if the crater was young enough.

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Comment from iiEarth on 13 February 2020 at 17:44

I agree with YuanIs mainly on the scale part; the diameter of the Sudbury Crater is approximately one-hundred-and-thirty kilometers, and the crater which you created has a diameter of about seven kilometers. You can do it proportionally, though; maybe there was some mining, but only very little. Now, the crater could be some small historic reserve, with the rest of the island and most of the crater being a nature reserve.

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Comment from RubyIGuess on 13 February 2020 at 18:17

The main idea was that ores would have been thrown up as ejecta and would have made up part of the outer ridges.

The thing about the scale and the age of the crater makes a lot of sense, and I feel like that makes it so this couldn’t be a major place like Sudbury.

I still like the idea that this once had mining town on it, so I feel like I’ll make it so the place once had some mining operations. These mining operations, while yielding some ores, weren’t enough to really turn this into a major urban area. The majority of the south of the island was soon after was turned into a nature reserve, with the towns now mainly turning to tourism.

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Comment from Marcello on 13 February 2020 at 20:38

Just a thought:

Is it not reasonable to assume that the impact also caused some sort of tsunami that would have made visible impact on the mainland directly opposite the crater? Or was the impact in a period that the water level was lower (cheap escape route to more complicated mapping ;-) ?


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Comment from RubyIGuess on 14 February 2020 at 02:50

I'm pretty sure it would, but I'm not sure how tsunamis would affect the geology of the area other than moving loose dirt and sediment around.

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