High Guard page 77: what's the tonnage of planetoid results (8-12)? And do planetoids automatically change the ore type to "nickel iron planetoids" for the purpose of the Commodity Prices table on page 79?
I've been going with, "8=10,000,000 tons, 9=100,000,000 tons, 10=1,000,000,000 tons, 11=10,000,000,000 tons, 12-then-1=100,000,000,000 tons, continue the pattern for 12-2 through 12-6".
Though the net yields seem a little much. Just one find at 7+ for size (7=1,000,000 tons), with an average 14% usable yield (140,000 tons), with crystal-type ores (50,000 credits/ton; if you're searching a trojan belt, on average at least 1 in 3 asteroids will have useful crystal ores, which on average can be found in surveyed in less than the 14 shifts that a lone prospector can manage in a week, let alone the 28 shifts that a 2+ person crew can manage in that time). Staking the claim is practically a autosuccess, so long as someone on the crew took Admin 1+. Selling the claim is likewise likely enough not to discount; the average 10% price (actually 10.5%, but 10's simpler math) brings the average haul to 700 megacredits for a week's worth of work.
Granted, this is very spiky: it's quite possible or one team to spend a week finding only small or worthless rock, and for another team to find teracredit (or even petacredit, if 12-6 is 10,000,000,000,000,000 tons) hauls right off. The main swinginess seems to be the size of the rock (and thus part of why it seems valid to say that size rolls of 8+ mean "use planetoid prices", merely 400 credits/ton).
