Table 10.1
Sea-bed Resources (After I.M. Broadus,
1987, Science
235: 853, simplified]
N
-..,J
00
Sea-bed
Sea-bed
World
Sea-bed share
Sea-bed
World
Sea-bed
~
deposits
production
production
of world reerported
onshore
comparison to
[Il
(10 6
metric
potential
world resources
0
venues
resources
c::
tons)
(%)
resources
(%)
(l
'"
[Il
Crude oil
789
2789
28
> 61430
181 860
34
§'
S
(metric tons of
S'"
oil equivalent)
0
(")
Natural gas
247
1296
19
> 60000
228210
26
'"
' "
(metric tons of
::0
:!l
oil equivalent)
0
0
....
Sand and gravel
112
7802
> 660000
Very large
Small
Shell carbonates
17
1667
90000
Very large
Small
Phosphorites
159
7940
129500
6
Mineral placers
Tin
0.028
0.2
14
2.5
34.5
7
Co
6-24
11
55-220
Nodules and
Ni
35-13\
130
27-100
Crusts
Mn
706-2600
10 900
6-24
Cu
29-108
1600
2-7
Massive sulfides
??