See the risk list here:
http://www.bgs.ac.uk/mineralsuk/statistics/riskList.html
V has a risk of 4.5, Ti is a bit lower down at 2.5. Both metals are not scarce, their ranking is a result of political stability of the suppliers. This means SPM are looking at a window which could in the future potentially close, with prices not holding up as more supply of these metals comes online.
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