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First Survey of Commercially Viable Asteroids Estimates Only 10 Are Worth Mining
KentuckyFC writes "In 2012, Richard Branson, Larry Page, and Eric Schmidt announced the launch of Planetary Resources, an ambitious start up with the goal of mining nearby asteroids for natural resources. Now an academic survey of ore-bearing asteroids estimates that only about 10 are likely to have resources worth mining. The new approach is to create a Drake-like equation that starts with the total number of asteroids and determines the percentage that are close enough to Earth, the percentage of these that contain valuable resources, the percentage of these large enough to pay for a space mining mission and so on. Each of these factors is filled with uncertainty but the bottom line is that when it comes to platinum group metals such as platinum, palladium, and iridium there are likely to be very few worth exploiting. That has significant implications for the future of space exploration. With so few commercially-viable space rocks out there, knowing which ones to pursue will be hugely valuable information, concludes the study. And that means the prospecting of asteroids is likely to become a highly secretive commercial endeavor in the not-too-distant future."
This kind of estimating may have an order of magnitude error. So it could easily be only 1 asteroid worth mining. Let the asteroid war begin!
And much like the Drake equation if even one of the inputs is a WAG the final result is meaningless.
I am becoming gerund, destroyer of verbs.
What we need for this to work is essentially the Star Wars economy. Wonder how they built the Death Star and all those massive ships? Droids. If we can launch something up there that can harvest enough materials and build what it needs up there to keep going, then it just takes one launch. It sends robots to the right asteroid. They extract metals, build more robots, build space ships, go to other asteroids, and keep repeating the process. Occasionally they send shipments back home.
We're a long ways away from that level of technology, but I don't think there's anything preventing us from getting there.
For energy, the robots could either build nuclear or solar power systems.
For manufacturing, 3-D printing is likely an enabling technology. It needs to advance way beyond where it is now, such as making full computers.
Refining the raw materials found on the asteroids is another obstacle.
I would guess it's 50 to 100 years out.
Gold created a short term spike of activity and created all kinds of damage for which we are still paying. California is all tech, agriculture, and movies now. None of that stuff runs on gold, but gold ran on mercury which still contaminates many of our bodies of water. Fish from Clear Lake (terrible misnomer) are almost inedible because of Hg contamination.
Mining sucks in the long run. Sustainable forestry, fishery, and agriculture are the true key to prosperity. That's not just California greenie hippie bullshit. It's the dogone truth.
In many ways, these equations are almost worse than useless. For years, the Drake Eq. gave everyone the impression there were 1 or 2 other planets in the whole universe that could support life, and reinforced the whole contingent for which space exploration is never a "cost effective" endeavor. Then we found out "oh, wait, all our guesses were wildly pessemistic." They get filled with extrapolated numbers about a place we've only begun to tip-toe into and then make dire predictions.
Some are also just wrong. For example, he uses 4.5 km/s delta-V but that doesn't even cover the maxima for Liquid Fuel Rockets (7 to 9 km/s). If you start to approach tech like Electrostatic or Hall Effect (Ion) Thrusters you get up into numbers more like 50-100 km/s, which would probably multiply his 10 number by a bit (most of the Oort Cloud becomes available over time).
There's just so much fuzziness here its hard to find the use in it.