Solid fuel Moon rockets (was Economics)

>>> or alternatively, if you have access to an electrolysis cell, then the only
> required inputs are regolith and electricity.

Yeah, and a big pile of electrodes. Where do you get the electrodes
from?>>>

Import them from Earth (initially at least). If I remember correctly, the
largest single problem with the platinum electrodes, is molten iron particles.
These have the unpleasant tendency of alloying with the electrodes, destroying
them. Limiting convection and motion within the magma will limit this.

Platinum is found on the moon, in the form of asteroidal iron granules. These
are distributed within the regolith in concentrations of 1 part in 200. This
iron can be removed, by first crushing the soil and then filtering it with a
magnet. The platinum is present within the iron, in concentrations of 20 parts
per million. There is also reason to believe that many impact craters contain
asteroidal iron fragments. Processing asteroidal iron would also yield a great
deal of Nickel and Cobalt.

Tony

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