I would argue for a different version.
1 000 000 tons: 32 percent dense metals so 320 000 tons dense metals worth 50 000 a ton or 16 Billion Credits
pg 76. the remaining material of the asteroid is 680 000 tons: 50 % is Common Ore @1000 /ton or 340 million Credits
30% Uncommon ore or 204 000 tons @5000 / ton for 1.02 Billion Credits
And 136 000 tons of waste material of no value that you might be able to melt and form into a slag ship and create your own rock fleet.
Total Value of Asteroid is 17.36 Billion Credits.
pg 79 10% offer of total yield of claim, so the offer on the table would be 1.736 Billion Credits.
How a claim is sold depends on the relationship the belter has with those who would buy the material. Also the asteroid’s yet-to-be-mined ore is of a lesser value
to fully processed material, so the base price in any negotiation is 10% the value of the commodity. With an Average (8+) Admin check (1D days, SOC) the
belter can establish a sales channel with a nominated corporation. The belter must provide the estimated market value of the yield and the corporation will
conduct a cursory check of the detailed survey analysis. It then offers the belter 1D + 7% (that is, 8% - 13%, with an average of 10%) of the claim’s value as an immediate cash realisation. This is increased by +1% for every level the belter has in the Broker skill.
So every 1 rank in Broker is worth 173 million extra credits. It pays to study in your off time.
Moral of the story, asteroid mining will create the worlds first trillionaires.
Now your example is a bit of a fluke in that you scored a 12+ on the 2D roll to get a D asteroid.
HMMMM... wait a second. As I doublechecked this I saw something odd. How did you determine that the Dense material was actually Dense worth 50 000 and not metallic nickel iron worth 400? There seems to be a gap in the rules.
M Class: Metallic-based. Usually nickel-iron, but with the
potential to yield precious and heavy metals depending
on the location within the belt. M class asteroids are
reasonably dense in composition, containing high-grade
sources of metal, along with exotic elements such as
radioactives and super-dense metals. This makes them
valuable for manufacturing industries and larger examples
can be turned into starship hulls at any orbital A class
starport or similar grade of dockyard. M class asteroids
are most common in the N zone of the belt and are
targets for most prospectors.
Scanning on pg 75 shows dense objects including metals, Crystalline, including ice, and exotics on a roll of 12.
Detailed survey andm logistics on pg 75 shows metallic asteroids, Carbon asteroids or ice.
To be honest I do not see how you get Crystals at 20 000 / ton, dense at 50 000 or radioactives.
With a nickel iron find the value of the 32% drops to 128 million and 1.488 Billion total. This would be a 148 million offer for the claim.