It all started with Tesla Motors’ (NASDAQ:TSLA) announcement of its battery gigafactory in February 2014. That news was discussed endlessly with breathless excitement. The news sparked a revival in lithium, cobalt and graphite juniors. For example, Western Lithium USA (TSX:WLC), based in Nevada, more than doubled that month. At the time, I wrote a few articles saying that the gigafactory was great news for select graphite companies. I didn’t mention lithium or cobalt, simply because I was less fluent in those...