... Once space travel becomes an easier feat and costs less, mining can become a very serious prospect as a source of profit...
Once pigs fly, unbrella sales will soar.
There is an equation using the specific impulse of chemical rocket fuels that relates the lift off weight to the payload weight. - You obviously are ignorant of it.
Until chemical rockets are not needed, the cost of bringing anything back from the moon will be at least 100 times higher than getting same material from Earth.
It is not a question of "improving technology" but a fundamental fact of physic (or chemistry) that huge masses of fuel must be burned for each pound that goes to the moon and then very large masses of fuel must be burned for every pound that is returned to Earth.
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Some actual facts:
The LEM assent module which lifted of the moon weighed 10,024 lb at launch but a large fraction of that was the fuel. Lets say 500 useful pounds was returned from the moon to the Earth. Two men, their air, water, etc. requirements being ~50% weight. The LEM structure, batteries etc. being more than 45%. Thus, the "mineral cargo" was less than 50 pounds.
The launch weight of the Saturn V used to go to the moon was 6,699,000 pounds, mostly the liquid Hydrogen Oxygen fuel which costs considerably more than $10 / pound. So the cost of just the rocket was SIGNIFICANTLY MORE THAN 70 million dollars (not counting the development costs or the earlier testing with Saturns, or the ground control expenses. If they were included, the cost easily exceeded 100 million dollars).
Thus the cost per pound of minerals returned was more than a million dollars a pound, probably more than two million dollars per pound of minerals returned to earth. One percent of that cost is more than $10,000 / Lb, probably more than $20,000 /Lb, but I will continue with the lower figure. Gold costs about $10,000/ pound. So gold returned from the moon would cost 100 times more than gold from the Earth.
Again there is nothing on the moon that is not available on the Earth 100 times cheaper.
And this assumes there is zero cost to extract it from them moon - I.e. if gold, I am assuming there are gold bricks just sitting on the surface to pick up.
No need to transport any mining equipment to the moon etc.
ENOUGH OF THIS NONSENSE ABOUT GOING INTO SPACE FOR THE RESOURCES THERE.