NASA Briefs Preliminary Plume Findings from Moon Mission |
NASA Briefs Preliminary Plume Findings from Moon Mission |
Nov 10 2009, 09:26 PM
Post
#1
|
|
Member Group: Members Posts: 239 Joined: 18-December 07 From: New York Member No.: 3982 |
|
|
|
Nov 14 2009, 08:33 PM
Post
#2
|
|
Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
Well we've now got three estimates in the same ballpark. Converting to ppm: nprev 12ppm, myself 25ppm and P Hayne 1-10ppm.
I started wondering - if that were gold would we mine it? So with this thought here's a comparison from Wikipedia: "Gold extraction is most economical in large, easily mined deposits. Ore grades as little as 0.5 g/1000 kg (0.5 parts per million, ppm) can be economical. Typical ore grades in open-pit mines are 1–5 g/1000 kg (1–5 ppm); ore grades in underground or hard rock mines are usually at least 3 g/1000 kg (3 ppm). Because ore grades of 30 g/1000 kg (30 ppm) are usually needed before gold is visible to the naked eye, in most gold mines the gold is invisible." |
|
|
Lo-Fi Version | Time is now: 25th September 2024 - 06:42 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |