16 requires some time causing a lag between price development and the size of the reserves. The reserve supply period -which is the number of years that the supply of phosphate can continue at the present level- rose from 86 years in 1994 to 135 years in 2001 and then recently fell back to 90 years, the sharpest drop occurring in 2007. The reserve base supply period rose from 266 to 397 years in 2001 and dropped to 281 years in 2008. Due to the recent price increase, which will result in an increased reserve base, the reserve base supply period is also expected to increase in the near future. Table 2.2: Phosphate rock production in 2007 and 2008, and reserves and reserve base in 2008 (USGS, 2009). Note: Reserve has the unit x 100 Mt RP while production has the unit Mt RP (year)-1. Country Mine production (Kt) 2007 2008 50 000 30 900 28 000 11 000 7 800 6 000 5 500 3 700 3 100 2 400 2 300 3 000 800 800 600 10 800 167 000 Reserves (Mt) 4 100 1 200 5 700 200 100 260 900 100 180 1 500 82 100 30 25 50 890 15 000 Reserve base (Mt) China United States Morocco and Western Sahara Russia Tunisia Brazil Jordan Syria Israel South Africa Australia Egypt Togo Canada Senegal Other countries World Total 45 500 29 700 27 000 11 000 7 800 6 000 5 540 3 700 3 100 2 560 2 200 2 200 800 700 600 8 110 156 000 10 000 3 400 21 000 1 000 600 370 1 700 800 800 2 500 1 200 760 60 200 160 2 200 47 000 Figure 2.1: World production, reserves and reserve base of phosphate rock over the period 1994 - 2008 (USGS, 2007; USGS, 2009). Reserve has the unit x 100 Mt RP while production has the unit Mt RP (year)-1. Pagina 25
Pagina 27Interactieve digi spaarprogramma, deze weekblad of rapport is levensecht online geplaatst met Online Touch en bied het digitaliseren van online reisgidsen.
458 Lees publicatie 159Home