That is a good website... on brief review it is pretty fair. I was actually answering a question posed by @teotze_hao rather than seeking those answers for myself though
Nearology is a great theory... 80% of new discoveries are found near existing mines (lots of reasons for this)... but it isn't infallible. Beware when exploration companies talk about "elephant country" though...
Cobalt is also often associated with copper... but an association with a mineral doesn't guarantee value to the mining company. Many Co grades are below payable limits and as such it is only the smelter who profits from it.
