There was an article recently about the Indonesian government "cracking down" on scores of independant tin miners. After that, only those issued permits would be allowed to export.
The reduction in exports apparently has been supportive for tin prices.
As it turns out, Timah seems to be the only one qualifying for a permit so far. Quite a coincidence. <g>
Regarding the chart, the stock PPS has done well, however, it now looks a little toppy to me, one may note that the upward momentum has slowed and is bouncing off resistance. It could be prudent to wait for more of a pullback or for the trend to re-assert itself.