The Resources of the Earth - Thanatia: The Destiny of the Earth's Mineral Resources - page 163

Table 6.10: Mineral world reserves, reserve base and world resources. All values
are for 2008 if not otherwise specified - continued from previous page

Production Reserves Reserve

base
(year
2006)

World
resources

Ore
grades

Resource tons tons tons tons %

Niobium 6.29E+04 2.90E+06 3.00E+06 N.A. 0.64

Osmium N.A. N.A. N.A. N.A. 82.2 ppb

Palladium 2.04E+02 N.A. N.A. N.A. 158.5

ppb

Phosphate
rock

1.61E+08 1.60E+10 5.00E+10 N.A. 0.11

Platinum
group
metals

4.65E+02 7.10E+04 8.00E+04 > 1.00E+05 See Pt,

Pd, Rh,
Ru, Ir
and Os

Platinum 2.21E+02 N.A. N.A. N.A. 802.4

ppb

Potash 3.48E+07 8.50E+09 1.80E+10 2.50E+11 25

Rare
Earths

1.34E+05 9.90E+07 1.50E+08 Undiscovered

resources are
thought to be
very large re-
lative to
expected
demand

6

Rhenium 5.65E+01 2.50E+03 1.00E+04 1.10E+04 223 ppm

Ruthenium N.A. N.A. N.A. N.A. 220 ppb

Selenium 1.51E+03 8.80E+04 1.70E+05 N.A. 2.50

Silicon 6.16E+06 N.A. N.A. N.A. 0.65

Silver 2.13E+04 4.00E+05 5.70E+05 Large 4.3 g/t

Strontium 4.96E+05 6.80E+06 1.20E+07 > 1.00E+09 34

Tantalum 1.17E+03 1.10E+05 1.80E+05 N.A. 0.65

Tellurium 132 (Year

2006)

2.20E+04 4.70E+04 N.A. 1 ppm

Thallium 1.00E+01 3.80E+02 6.50E+02 6.47E+05 N.A.

Thorium N.A. 1.30E+07 1.40E+06 2.50E+06 3

Tin 2.99E+05 5.60E+06 1.10E+07 N.A. 0.48

Rutile 6.21E+05 4.50E+07 N.A. 1.29E+08 0.69

Ilmenite 6.79E+06 6.80E+08 N.A. 2.00E+09 0.69

Uranium 4.39E+04 5.47E+06 N.A. 1.00E+07 0.33 (as

U 3 O 8 )

Vanadium 5.61E+04 1.30E+07 3.80E+07 > 6.30E+07 2.00

Wolfram 5.59E+04 2.80E+06 6.30E+06 N.A. 0.72

Yttrium
(as Y 2 O 3 )

8.90E+03 5.40E+05 6.10E+05 N.A. N.A.

Zinc 1.16E+07 2.00E+08 4.80E+08 1.90E+09 4.06

Zirconium
(as ZrO 2 )

1.28E+06 8.34E+07 N.A. N.A. 0.27

End of the table