home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky alt.rush-limbaugh:12377 talk.politics.space:1626 sci.space:18345
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!cs.utexas.edu!rutgers!rochester!dietz
- From: dietz@cs.rochester.edu (Paul Dietz)
- Newsgroups: alt.rush-limbaugh,talk.politics.space,sci.space
- Subject: Re: Justification for the Space Program
- Message-ID: <1992Dec29.164827.13239@cs.rochester.edu>
- Date: 29 Dec 92 16:48:27 GMT
- References: <1992Dec23.110509.22141@ke4zv.uucp> <1hobsgINN3b1@agate.berkeley.edu> <JMC.92Dec28192905@SAIL.Stanford.EDU>
- Distribution: usa
- Organization: University of Rochester
- Lines: 29
-
- In article <JMC.92Dec28192905@SAIL.Stanford.EDU> jmc@cs.Stanford.EDU writes:
-
- > Let me add to the previous post the estimate that the total amount of
- > matter humanity has processed in its history is less than 10^12 tons.
-
- Some interesting facts:
-
- Estimated mass of manganese nodules on the ocean floors: ~ 10^12 tons.
-
- Average concentration of metals in nodules (percent)
-
- Element World Average Pacific Clarion-Clipperton Zone
- --------------------------------------------------------------
- Mn 18.6 25.4
- Fe 12.47 6.66
- Ni .66 1.27
- Cu .45 (not listed, > .45)
- Co .27 1.02
-
-
- World-wide, nodules are estimated to contain billions of tons of
- copper and nickel, and enough manganese to supply current mine demand
- for that element for roughly 10,000 years. Additional sources of
- metals (such as copper and cobalt) are available as crusts on the sea
- floor, and in massive sulfides deposited at mid-ocean ridges and then
- carried away by plate motion.
-
- Paul F. Dietz
- dietz@cs.rochester.edu
-