Did you trust the plan, anon?
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16Worth it to also invest in elements other than Ag, Au, Pt, & Pd. You don't even have to invest in the metals themselves. Just get jars of the oxides for most of them. Even with Ag, Au, Pt, & Pd you can get simple compounds or solutions of them so that they aren't readily identifiable and less likely to be stolen or even searched for.
Beyond bullion, don't forget the other two of the "3 B's": Bullets and Booze. Stock up on ammo and quality alcohol, both of which will be far more useful than gold or silver after the collapse of civilization.
Aluminum? Knowing how to make aluminum metal from bauxite or similar minerals will be useful. Admittedly, you'd have to develop some other technology first, but imagine having that knowledge and skill back in ancient times. You'd be a god-king of a powerful nation with that type of power.
Aluminum isn't like iron or steel. This is why, despite aluminum being one of the most abundant elements on Earth, the metal was practically nonexistent until the 19th century.
IIRC the capstone of the Washington Monument was forged out of aluminum for prestige because modern refinement techniques had not been discovered and metallic aluminum was extremely rare.
But I don't think there's any similar thing for gold or silver. For those you either prospect harder / deeper, or you start looking at asteroid mining...
Another thing to watch is deep hole drilling. Limitation of drilling is:
1. You need to transmit power down to the bit, so you need some kind of shaft/rod/hose/wire (in practice they currently use rotating shafts).
2. Mechanical bits dull, and then you need to pull them all the way up to change them out
So drilling costs rise with the square of the depth. But there's some research on using laser / magnetron to burn away rock because you can power them with a wire, and they don't dull.
What is invented for geothermal and oil might be repurposed for prospecting...
Asteroid mining doesn't make sense because deep space exploration is the most expensive endeavor humanity has ever undertaken, with few ways to cut costs that don't involve space elevators which require materials we can't produce or functionally limitless energy, and that's just for missions that aren't trying to extract and retrieve literal tons of material on a recurring basis.
And also if you're manufacturing tools and equipment for use in space, you do that on Mars because there's much less of a gravity well there...
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11The low Martian gravity actually makes it a bad choice for long term colonization.
Floating city ships (buoyed by oxygen and nitrogen as lifting gases) in the atmosphere of Venus provides near Earth gravity, 1 ATM. of pressure and Earthlike temperatures. The heavy atmosphere even protects from cosmic and solar radiation.
A floating city in sulfuric acid clouds is a harder sell than Mars, which is funny because an airless frozen desert has never sounded like a good time to me either.
Sulfuric acid clouds are easy to deal with via technology we have now, like seriously easy. No fix for the low gravity.
Sure, I'm just saying it's harder to make seem sexy in that sci-fi way they market theoretical space colonization.
Let the rubes have their dream of Mars. Venus will be for us who will have our floating city-states run by genetically engineered kemonomimi girls.
then you go bankrupt
You do your prospecting with radiospectroscopy, so you don't even leave home base until you know what you're looking for...
Next question.