World Resources of Boron
These figures show the world resources and the annual world production of Boron.
As you can see Turkey, the USA and Russia are the main countries to supply Boron, the element which is needed to form the sodium borohydride compound. The world resources on Boron are huge and will last for many years. Note that unlike oil, sodium borohydride fuel can be reproduced!!!
Total (rounded) 410,000 thousand metric tons
Source: Published by USGS Mineral Resources Program: http://minerals.usgs.gov